A total of 84 original papers about bacterial bioremediation were selected for this review. The selected papers were listed in Online Resource, sheet SI1 (de Moraes Farias and Krepsky 2022). Figure 1 reveals an increasing trend in the number of studies about BP biodegradation in the past years (p = 0.0044). The first study investigating the biodegradation of other BP together with BPA was published in 1992 (Lobos et al. 1992). Fourteen years later, a second study about the biodegradation of bisphenol analogues was published (Ike et al. 2006). After this publishing hiatus, the number of studies on bacterial degradation of bisphenol analogues increased almost six times from 2000 (n = 2) to 2020 (n = 11) (Fig. 1). Meanwhile, the year 2019 was the most productive for BP. A total of 13 papers were published in 2019 concerning all analogues of bisphenol, especially BPA, BPS, and BPAF (Fig. 1). Then, in 2020, the biodegradation of bisphenol analogues other than BPA ⎼ BPS, BPF, BPB, BPE, BPAF, BPZ, BPM, BPPH, and BPAP ⎼ was most studied (Fig. 1).
Evidence of the BPA risk to human and environmental health may have encouraged researchers to investigate ways of removing this compound from the environment. Furthermore, the increase in BPA interest also influenced important government decisions. For example, in 2006 the European Food Safety Authority (EFSA) issued a risk assessment opinion for the use of BPA. The panel members established as tolerable a daily consumption of 50 µg kg− 1 of BPA (EFSA 2015). Seven years after this issue, in 2013, studies started to establish a thorough assessment of the risks of BPA. The EFSA evaluation included the quantification of exposure from non-dietary sources. The most vulnerable groups of the population were also included in the focus of these studies, including pregnant women, babies, and children (EFSA 2015). In 2015, the maximum acceptable daily intake of BPA was diminished from 50 µg kg− 1 to 4 µg kg− 1 including dietary and non-dietary sources (EFSA 2015). In August 2015, the United States Environmental Protection Agency (U.S. EPA) released a list of 19 replacements, including other BP, to replace BPA in thermal papers (U.S. EPA 2015). In December 2016, the European Commission has added BPA to the list of restricted substances. Later, in January of 2017, a decree came into force prohibiting the use of BPA in concentrations greater than 0.02% in thermal papers after January 2nd, 2020 (Björnsdotter et al. 2017). In 2018, emerged the first restrictions for the use of BPA in canned food coatings (EU 2018). In Brazil, the Brazilian National Health Surveillance Agency (ANVISA) also banned the manufacture and import of baby bottles with BPA by a Resolution published in 2011 (Brazil 2011). Thus, increasing awareness may explain the increasing number of publications on bacterial biodegradation of BP in the years 2007, 2015, 2017, 2019, and 2020 (Fig. 1).
3.1.2 Environmental compartments
Figure 4 summarizes the environmental compartments assessed on bacteria biodegradation studies of bisphenol analogues until 2020. Water was the compartment most studied (n = 21) and with the highest number of studies on analogues different from BPA (Fig. 4). Considering the bisphenol analogues and the water compartment, BPA (n = 20) was the compound most analyzed, followed by BPS (n = 6) and by BPF (n = 6) (Fig. 4). Some authors also investigated the bacterial degradation of BPB (n = 5) and BPE (n = 5) in BPA studies (Frankowski et al. 2020; Ike et al. 2006; Inoue et al. 2008; Sakai et al. 2007; Zhou et al. 2020) (Fig. 3 and Fig. 4). However, studies with the other BP were rare. For example, the analogues BPP (Inoue et al. 2008; Ike et al. 2006), BPAF (Frankowski et al. 2020; Zhou et al. 2020), and BPZ (Zhou et al. 2020; Sakai et al. 2007) were included in two studies (Fig. 4). Moreover, one study evaluated the bacterial biodegradation of BPC (Sakai et al. 2007) or BPM ( Zhou et al. 2020) (Fig. 3 and Fig. 4).
The popularity of BPA in bacterial biodegradation studies in environmental compartments can be attributed to its ubiquity and higher environmental concentration than other BP (Caban and Stepnowski 2020; Chen et al. 2020; Flint et al. 2012; Lalwani et al. 2020; Ozhan and Kocaman 2019; Peteffi et al. 2019). The most researched analogues coupled with BPA in water were BPF and BPS (Fig. 3). These three analogues (BPF, BPS, and BPA) were found in 53 surface water samples collected from different regions of India (Lalwani et al. 2020) and were also detected in water samples from China, Poland, Japan, and Korea (Caban and Stepnowski 2020; Yamazaki et al. 2015). In China, those analogues were detected in the Pearl River coupled with TBBPA (tetrabromobisphenol A) (Chen et al. 2020). In Poland, BPS was detected in concentrations similar to BPA in Gdansk (Caban and Stepnowski 2020). Besides, BPF was also reported in higher concentrations than BPA in Southeastern Asian rivers (Yamazaki et al. 2015).
Afterwards, water treatment plants were the second compartment most assessed (n = 18) in studies for biodegradation of BP (Fig. 4). In the water treatment plants category, we included studies on activated sludge and effluents. Activated sludge is the most popular technique for water treatment plants. This technique supports microbial communities able to remove nutrients and xenobiotics (Noszczyńska and Piotrowska-Seget 2018). Because of its high nutrient richness, the sludge can be used as a fertilizer. However, polluted fertilizers can contaminate the soil, and groundwater, and reach the food chain (Wang et al. 2019). Consequently, some studies focused on the degradation of BP in sludge. Three authors studied the biodegradation of BPA and BPF analogues (Frankowski et al. 2020; Lobos et al. 1992; Zühlke et al. 2016). Two papers included the biodegradation of the analogues BPAF and BPS (Frankowski et al. 2020; Choi et al. 2019), BPB (Lobos et al. 1992; Zühlke et al. 2016), BPZ (Lobos et al. 1992; Zühlke et al. 2016) and BPE (Frankowski et al. 2020; Zühlke et al. 2016). Nevertheless, one study investigated the biodegradation of BPC (Zühlke et al. 2016) (Fig. 4).
Effluents from treatment plants can be the main source of BP to the environment, including BPA (Caban and Stepnowski 2020; Sun et al. 2017; Zhang et al. 2019b). The analogues BPA, BPF, and BPS were predominant in water treatment plant sludge from Korea, China and India (Lalwani et al. 2020; Hu et al. 2019; Sun et al. 2017). Besides, these three BP dominate water and sewage sludge samples from other countries (Wang et al. 2019; Yamazaki et al. 2015). Lalwani et al. (2020) associated the highest concentration (14,800 ng.L− 1) of BPA in an Indian river with the discharge of untreated sewage effluent (Lalwani et al. 2020). Conversely, the analogues including BPB, BPZ, and BPAP were hardly reported in sludges (Hu et al. 2019). Although, the analogues BPB, BPZ, BPAP, BPP, and BPAF were detected in sewage treatment plants in India (Karthikraj and Kannan 2018). In Slovenia, the analogue BPZ was detected in effluent samples in higher concentrations than other BP, including BPB, BPC, BPE, BPAP, BPAF (Česen et al. 2018). In China, the sludge of water treatment plants in Xiamen City presented the highest concentrations of the analogues BPA, BPF, BPS, including BPAF and BPE (Sun et al. 2017). Pieces of evidence report that the analogues BPB, BPE, BPAP, and BPAF are little degraded in treatment plants (Sun et al. 2017; Wang et al. 2019a; Česen et al. 2018). Therefore, research efforts to investigate the biodegradation of other BP and their ideal conditions, especially in sewage and industrial effluents are imperative.
Besides, sediment (n = 15) and soil (n = 15) were the third compartments most popular in studies on BP biodegradation (Fig. 4). Likewise, BPA was the most investigated analogue in sediment and soil. Fourteen (n = 14) studies focused on the biodegradation of BPA in sediments and twelve (n = 12) in the soil compartment. One of those 14 studies regarding BPA biodegradation (Chang et al. 2014) in sediment, also included the BPF analogue (Fig. 3). Additionally, one single study (Fig. 3) focused on the bacterial degradation of BPS analogue in sediments (Wang et al. 2019b).
The presence of BPA in sediments was detected in various locations including India, Italy, and China (Li et al. 2019; Mukhopadhyay et al. 2020; Pignotti and Dinelli 2018). A previous study reported higher concentrations of BPA in the sediment than in the water column (Flint et al. 2012). Moreover, Huang et al. (2012) associated the concentrations of BPA in sediment with the high concentration of BPA found in water. Yamazaki et al. (2015) observed that BPF can deposit in the sediment, suggesting that more hydrophobic BP can accumulate in sediment. Nonetheless, the eventual release of bisphenols analogues from the sediment into the water can increase its concentration in the underlying water (Chen et al. 2020). Therefore, studies considering different BP should focus on this compartment.
Notwithstanding, soil studies investigated the biodegradation of more bisphenol analogues than sediment studies (Fig. 4). Indeed, the soil was the second compartment with papers assessing the biodegradation of different bisphenol analogues after the water compartment. For example, coupled with BPA, four studies on bacterial degradation in soil included BPS (Choi and Lee 2017; Elthouky et al. 2020; Frankowski et al. 2020; Oshiman et al. 2007) and BPF analogues (Elthouky et al. 2020; Frankowski et al. 2020; Ren et al. 2016; Zühlke et al. 2020). Three papers studied the degradation of BPB analogue in soil (Elthouky et al. 2020; Oshiman et al. 2007; Zühlke et al. 2020). A single study (Fig. 4) focused on the bacterial degradation of BPAF in soil (Choi and Lee 2017). Furthermore, some authors focused on the degradation of different bisphenol analogues in soil, excluding BPA from the investigation. For instance, Cao et al. (2020) studied the BPS, Lu et al. (2017) investigated the BPF, and Zühlke et al. (2020) analyzed the biodegradation of seven bisphenol analogues, including BPB, BPC, BPE, BPF, BPZ, BPAP and BPPH (Fig. 3). However, the last authors published a previous paper addressing exclusively BPA biodegradation in soil under the same experimental conditions (Zühlke et al. 2017).
Bisphenol analogues can reach soil from the discharge of landfills leachate, application of sewage sludge and biosolids as fertilizers, irrigation with wastewater effluents, and waste disposal (Corrales et al. 2015; Flint et al. 2012). Pérez et al. (2017) detected BPA in higher concentrations than other BP in the soil. In addition, these authors detected BPF in samples of soil from an industrial source and agricultural land irrigated with water recycled from a treatment plant (Pérez et al. 2017). Conversely, the analogue BPAF was detected only in the samples from agricultural land, but not in industrial soils (Pérez et al. 2017). Consequently, given the different sources of soil contamination and potential crop production contamination, further studies considering the biodegradation of other bisphenol analogues in soil are vital for food safety.
Last but not least, nine studies (n = 9) investigated the bacterial biodegradation of biphenol analogues in a bioreactor (Fig. 4). Again, BPA was the most popular bisphenol analogue in bioreactor studies. Eight studies (n = 8) focused on BPA degradation and a single one (Chang et al. 2014) included the analogues BPB and BPF (Fig. 3). Moreover, one single paper (Huang et al. 2019) focused on BPS biodegradation (Fig. 3 and Fig. 4). The bioreactor is one of the methods approved for treatment stations. Bioreactor allows a longer retention time of the compost to be treated, higher biomass concentration, and, consequently, higher bacterial density, favouring biodegradation (Hu et al. 2019). Besides, bioreactors can be fed, for example, with water, sludge, and other matrices (Chang et al. 2014; Huang et al. 2019, Oh and Choi 2019; Sathyamoorthy et al. 2018). Therefore, it is important to identify the microorganisms capable of degrading bisphenols under the operating conditions characteristic of bioreactors, including the optimization of this process.
The number of papers published in each environmental compartment varied over time (Fig. 5). Water was the most studied compartment concerning the biodegradation of bisphenol analogues from 1967 to 2009 (Fig. 5). BPA has a water solubility of 120–300 mg/L at room temperature (Staples et al. 1998) and started to be detected in aquatic environments in the late 1990s (Corrales et al. 2015). Together, both factors may explain why the studies of bacterial biodegradation in water were carried out so readily. Meanwhile, studies with other environmental compartments intensified after 2014, including sediment, soil, treatment plant, and bioreactor (Fig. 5). All these compartments are the source or destination of bisphenol analogues to the environment. Thus, approaching bacterial biodegradation of diverse bisphenol analogues in different compartments is imperative to understand this process and control their damage.
3.1.3 Bacterial biodegradation
Ninety-one bacterial strains capable of BPA degradation were reported in the literature. We listed in sheet SI3 of Online Resouce (de Morais Farias and Krepsky 2022) the bacteria reported in studies capable of degrading several BP and its environmental sources. Figure 6 summarizes the dominant groups of bacteria and indigenous microorganisms in studies on the biodegradation of BP until 2020. Indigenous microorganisms were the most studied group regarding bacterial biodegradation (Fig. 6). The main genera investigated for BPA degradation were Pseudomonas, Sphingomonas, and Bacillus (Fig. 6). Besides BPA, Sphingomonas species could biodegrade up to six bisphenol analogues, including BPS, BPF, BPB, BPE, BPZ, and BPC (Fig. 6). Likewise, Cupriavidus also biodegraded six different BP, besides BPA (Fig. 6). Meanwhile, Sphingobium was able to degrade six analogues including BPA, BPS, BPF, BPB, BPE, and BPP (Fig. 6). Bacillus biodegradation comprised degradation of five analogues ⎼ BPA, BPF, BPE, BPZ, and BPC (Fig. 6), and Pseudomonas presented degradation of only four analogues ⎼ BPA, BPS, BPF, and BPB (Fig. 6).
Despite the degradation of a limited list of bisphenol analogues (Fig. 6), Pseudomonas was the most studied genus for the degradation of BPA. Pseudomonas is known for its ability to degrade a variety of organic molecules, including aromatic compounds like toluene, biphenyl, naphthalene, phthalates, and others (Díaz et al. 2008; Goldberg 2000; Kimura et al. 2018; Kim and Park 2018; Palleroni 2015; Palleroni 2010; Yu et al. 2020). This genus is an aerobic, Gram-negative, rod-shaped bacteria that can be found in different environments and are flexible to environmental changes (Palleroni 2015). Consequently, it was observed that a Pseudomonas consortium had the best percentages of degradation of BPA, BPF, and BPB (Chang et al. 2014). Likewise, Pseudomonas was predominant in a consortium able to degrade BPS (Huang et al. 2019; Wang et al. 2019b) and Lu et al. (2017) identified a consortium with Pseudomonas that degraded BPF. Moreover, when the strain Pseudomonas sp HS-2 was isolated from this consortia, it was still efficient in BPF degradation (Lu et al. 2017).
Pseudomonas is also beneficial to plants, although it can be pathogenic to humans, animals, and plants (Palleroni 2015; Goldberg 2000). For example, P. aeruginosa is an opportunistic pathogen that can cause several infections and is resistant to several antibiotics (Hao et al. 2021). P. aeruginosa species can be used to improve BPA degradation, either by isolating it in nanofiber membranes (Liu al. 2015) or by using it in bioreactors (Mita et al. 2015). Louati et al. (2019) reported that P. aeruginosa Gb30 was able to degrade 60% of BPA in a concentration of 3 mM in 4 days (Louati et al. 2019). However, in the same study, the strain P. putida G320 presented the highest BPA degradation efficiency than other strains isolated from arid and desert soil (Louati et al. 2019). Indeed, another study showed that the strain Pseudomonas putida YC-AE1, isolated from a soil sample, can degrade BPA at high (50, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000 mg/L) and low (0.5, 1, 2, 4, 6, 8, 10, 12 mg/L) concentrations (Eltoukhy et al. 2020). This strain showed variable efficiency of degradation according to the BP tested. For example, in a concentration of 100 mg/L, biodegradation of BPA in 72h was 100%, BPS 30%, BPF 67%, and BPB 60% (Eltoukhy et al. 2020). Conversely, P. putida isolated from river water degraded in 10 days 87% of BPA in the concentration of 1 mg/L (Kang and Kondo 2002b).
Sphingomonas was the second genus most studied on BP biodegradation until 2020. Sphingomonas consists of aerobic, rod-shaped or ovoid, Gram-negative bacteria that can be mobile or not (Yabuuchi and Kosako 2015). They can reside in natural or modified environments and can be opportunistic pathogens (Yabuuchi and Kosako 2015). Sphingomonas possesses a wide metabolic versatility (Yabuuchi and Kosako 2015) and can degrade several recalcitrant aromatic compounds, including biphenyl, chlorinated furan, carbazole, chlorinated phenols, polyethene glycol, different herbicides, and pesticides, in addition to endocrine disruptors such as estradiol and nonylphenol (Asaf et al. 2020; Yabuuchi and Kosako 2015; Stolz 2009; Willison 2004). Likewise, this genus can degrade BPA and other BP such as BPS, BPF, BPB, BPE, BPZ, and BPC (Fig. 6).
Regarding bisphenol analogues, the Sphingomonas sp BP-7 could degrade approximately 90%, 100%, 94%, and 100% of BPE, BPB, BPC, and BPZ, respectively, at a concentration of 100 mg/L (Sakai et al. 2007). However, this strain was not able to degrade BPF and BPS. Sakai et al. (2007) suggested that the biodegradation of BP relies on the methyl or methylene group present between the two aromatic rings in some BP. Although present in BPA, neither methyl nor methylene group is present in the BPF or BPS analogues (Table 1). Consequently, Sphingomonas degradation of BPA was reported in many studies. For example, the strains isolated from soil Sphingomonas sp SO11, Sphingomonas sp SO1a, and Sphingomonas sp SO4a could metabolize BPA at a concentration of 115 mg/L in a period of 12h to 48h (Matsumura et al. 2009). Aditionally, Sakai et al. (2007) observed that the Sphingomonas sp. SP-7 can degrade 95% of BPA in a concentration of 30 mg/L in 40 days. However, total BPA degradation could be much faster by coupling Sphingomonas sp. SP-7 with Pseudomonas sp. BP-14. For example, in 7 days this consortium degraded 100% of BPA in the concentration of 100 mg/L (Sakai et al. 2007). Likewise, Yu et al. (2019) reported an increase in BPA degradation efficiency when Sphingomonas was in a consortium with the Pseudomonas. Moreover, the S. bisphenolicum strain AO1 degraded between 30% and 100% of BPA at a concentration of 100 mg/L in 44h, according to the glucose concentration in the growth medium (Oshiman et al. 2007). The metabolism of Sphingomonas bisphenolicum AO1 was also analyzed in other studies (Sasaki et al. 2005; Sasaki et al. 2008). For example, this strain could increase the community of indigenous microorganisms and the efficiency of BPA degradation (Matsumura et al. 2015).
Bacillus was the third bacteria genus most studied on BP degradation, after Pseudomonas and Sphingomonas (Fig. 6). The genus Bacillus is comprised of aerobic, or anaerobic facultative, rod-shaped, Gram-positive bacteria. These bacteria can occur individually, in pairs, in chains, or as long filaments (Logan and Vos 2015). They are present in several environments such as freshwater, seawater, soil, air, plants, and animals. Bacillus can form endospores and resist adverse environmental conditions, including desiccation, radiation, and chemical substances (Logan and Vos 2015). Besides, Bacillus can overcome extreme conditions including high temperatures, acidic environments, and extremes of salinity (Logan and Vos 2015; Maughan and Van Der Auwera 2011). Some studies reported that Bacillus can degrade BPA, BPF, BPE, BPZ, and BPC (Fig. 6). However, most research with Bacillus focused on the efficiency of BPA degradation. For example, the strain isolated from soil Bacillus sp YA27 took 60 h to degrade 100% of BPA at a concentration of 50 mg/L (Matsumura et al. 2009). Nonetheless, the strain Bacillus sp. KU3, isolated from the marine environment, showed 61% of efficiency in the degradation of BPA at a concentration of 1,000 mg/L in 15 days (Kamaraj et al. 2014). Therefore, the degradation efficiency decreased as the concentration of BPA increased (Li et al. 2012).
In lower concentrations of BPA (10 and 25 mg/L), the strain Bacillus pumilus, isolated from fermented Kimchi food, was able to degrade 100% of BPA at concentrations in 16h and 3 days, respectively. Likewise, B. pumilus grown in a medium increased by 10% of NaCl degraded BPA at a concentration of 10 mg/L in 2 days. However, this strain was not able to degrade BPA at the concentration of 50 mg/L and 10 mg/L with more than 12.5% NaCl (Yamanaka et al. 2007). Moreover, some studies reported an increase in BPA biodegradation with the combination of some Bacillus species with the macrophyte Dracaena sanderiana. For example, Bacillus thuringiensis isolated from the endosphere of the plant Dracaena sanderiana degraded in 24h, 95% of BPA at a concentration of 100 µM (Suyamud et al. 2018). Bacillus cereus NI, together with macrophyte Dracaena sanderiana and endophyte strains obtained a removal rate of 100% BPA in 5 days (Suyamud et al. 2020). Both strains belong to the Bacillus cereus group. B. thuringiensis is entomopathogenic and is used in the production of pesticides (Ehling-Schulz et al. 2019) and B. cereus is responsible for poisoning food and infections (Ehling-Schulz et al. 2019).
Some studies associated the cytochrome P450 monooxygenase system with the hydroxylation of BPA during biodegradation with Bacillus sp. GZB (Das et al. 2019). Bacillus sp. GZB could degrade in 96h, 100% of BPA at a concentration of 10 mg/L under aerobic and anaerobic conditions. Genes encoding the cytochrome P450 monooxygenase system were detected in the genome of Bacillus sp. GZB (Das et al. 2019). The cytochrome P450 monooxygenase system comprises cytochrome P450, ferredoxin, and ferredoxin reductase. Das et al. (2019) affirmed this enzyme complex is vital for BPA degradation. The same investigation was conducted with Sphingomonas bisphenolicum AO1, and the cytochrome P450 monooxygenase system was also involved in the BPA biodegradation (Sasaki et al. 2005; Sasaki et al. 2008). Additionally, it was reported that Bacillus produces other enzymes including the spore-laccase enzyme, which was responsible for the BPA biotransformation into less complex molecules (Das et al. 2019). Indeed, the genus Bacillus produces laccase and this enzyme is capable of catalyzing the oxidation of aromatic compounds (Lu et al. 2012), including phenol and other recalcitrant compounds (Das et al. 2019; Lu et al. 2012; Le et al. 2006; Held et al. 2005).
Regarding the other BP, the B. amyloliquefaciens strain was able to degrade 77% of BPA, 69% of BPF, and 77% of BPE in concentrations of 60 mg/L (Zühlke et al. 2016). Likewise, B. amyloliquefaciens degraded 95% of BPC at a concentration of 20 mg/L (Zühlke et al. 2016). Zühlke et al. (2016) investigated the degradation of BPZ by B. amyloliquefaciens. However, BPZ was poorly soluble and only a small portion (one-sixth) of the soluble phase could be detected at the High-Performance Liquid Chromatography (Zühlke et al. 2016). The degradation of bisphenol analogues resulted in the formation of bisphenol and phosphate conjugates. The authors suggested that this may be a mechanism to reduce the toxicity of BP and thus avoid the growth inhibition of the strain. However, the transformation of BP in these products proved to be reversible because after the formation of the products they returned to the initial structure of BP (Zühlke et al. 2016).
Sphingobium was another important genus in the biodegradation of BP (Fig. 6). Sphingobium is one of three new genera derived from Sphingomonas, including Novosphingobium, Sphingomonas stricto sensu, and Sphingopyxis (Takeuchi et al. 2001). A fifth genus Sphingosinicella was proposed later (Maruyama et al. 2006). Sphingobium is characterized by grouping strictly aerobic, rod-shaped, Gram-negative bacteria with glycosphingolipids in their cell envelope, and chemoorganotrophic (Takeuchi et al. 2001). Members of this genus are capable of degrading aromatic compounds such as naphthalene, biphenyl, m-xylene, phenanthrene, herbicides, and pesticides (Cai et al. 2015; Liang et al. 2010; Pinyakong et al. 2003; Révész et al. 2018; Önneby et al. 2014).
Furthermore, Sphingobium could degrade most bisphenol analogues, including BPA, BPF, BPS, BPB, BPE, and BPP (Fig. 6). For example, the strains Sphingobium fuliginis TIK1 and Sphingobium sp. IT4 were both isolated from the rhizosphere of plants and degraded 0.5 mmol/L of those six BP with 100% degradation efficiency in 24h. However, the biodegradation efficiency of BPP was 78% for S. fuliginis TIK1 and 91% for Sphingobium sp. IT4 (Toyama et al. 2013). Sphingobium sp. IT4 degradation of BP resulted in the hydroquinone and p-benzoquinone metabolites. Meanwhile, Sphingobium fuliginis TIK1 generated metabolites resulting from hydroxylation and meta cleavage of BP, which were consistent with the findings from BPA degradation by Sphingobium fuliginis OMI (Toyama et al. 2013). Degradation by this strain resulted in the 3-hydroxy BPA, 2,2-bis(3,4-dihydroxyphenyl) propane, 3-(4-hydroxyphenyl)-3-methyl-2-butanone, and 3-(3,4-dihydroxyphenyl)-3-methyl-2-butanone metabolites, which indicate hydroxylation of one or two aromatic rings and further meta-cleavage of this molecule (Ogata et al. 2013). Therefore, from this metabolic pathway, it was proposed that BP like the BPF and BPS could be degraded regardless of the chemical group present in the connection between the aromatic rings (Ogata et al. 2013). In addition, Sphingobium fuliginis OMI, also isolated from the rhizosphere, showed 100% of degradation efficiency for almost all BP cited in a concentration of 1 mM in 24h. However, the BPP for this strain was the exception and obtained about 67% degradation (Ogata et al. 2013).
In another study with strains isolated from the rhizosphere, the Sphingobium strain yanoikuyae TYF-1 was able to degrade 90% and 92% of BPA and BPF, respectively, at a concentration of 25 mg/L, over a long period of 42 days (Toyama et al. 2009). The products that originated from BPF degradation were ditrimethylsilyl (4HB), hydroquinone (1,4-HQ), and p-benzoquinone (1,4-BQ). Initially, it was suggested that Sphingobium strain yanoikuyae TYF-1 had a BPF degradation pathway similar to Sphingobium yanoikuyae FM-2 strain (Toyama et al. 2009). Indeed, the Sphingobium yanoikuyae FM-2 isolated from riverine water was able to degrade 100% of BPF at a concentration of 0.5mM in 9h when previously acclimated with the BPF. This efficiency decreased to 95% of BPF in 16h when acclimated with glucose. Toyama et al. (2009) proposed a degradation pathway in which the connection between the BPF rings undergoes a rearrangement, releasing 1,4-hydroquinone and p-hydroxybenzoic acid. Then, both generated metabolites could be completely degraded later (Inoue et al. 2008). However, despite BPF degradation, the Sphingobium yanoikuyae FM-2 could not degrade other BP including BPA, BPE, BPB, BPP, and BPS (Inoue et al. 2008). Moreover, Inoue et al. (2008) suggested that the Sphingobium yanoikuyae FM-2 strain could only degrade the BP with no methyl groups on the connection between the aromatic rings or in the aromatic rings. Therefore, there were differences in metabolic pathways for both strains Sphingobium fuliginis TIK1 and Sphingobium fuliginis OMI (Ogata et al. 2013; Toyama et al. 2013).
Despite few studies with Cupriavidus, this bacteria genus was relevant to BP degradation (Fig. 6). Some members of the Cupriavidus genus can resist heavy metals, synthesize polyhydroxyalkanoate and degrade xenobiotics (Wang et al. 2017). For example, the Cupriavidus basilensis is capable of degrading xenobionts including biphenyl, dibenzo-furan, ochratoxin A, 9H-carbazol, and others (Becher et al. 2000; Ferenczi et al. 2014; Suenaga et al. 2015; Waldau et al. 2009; Wang et al. 2017). Likewise, Cupriavidus basilensis could degrade BPA, BPE, BPB, BPC, and BPS (Fig. 6).
Regarding BPA degradation, Cupriavidus basilensis JF1 showed slow degradation of BPA as the single source of carbon. However, BPA degradation was accelerated with the addition of phenol as a co-substrate. Phenol acted as a degradation biostimulant. Almost 66% of BPA in the concentration of 0.21 mM was degraded in 150h when phenol was added (Fischer et al. 2010). Similarly, the strain Cupriavidus basilensis SBUG 290 obtained higher BPA degradation efficiency when previously cultivated with biphenyl, achieving 78% degradation of 0.26 mM in 48h (Zühlke et al. 2017). Thus, Zühlke et al. (2017) cultivated Cupriavidus basilensis strains in biphenyl to carry out degradation experiments with BPF, BPE, BPB, BPZ, BPC, BPAP, and BPPH (Zühlke et al. 2020). Cupriavidus basilensis SBUG 290 showed 98% efficiency in the degradation of BPC, 62% of BPB, 31% of BPE, and 6% of BPF, in 216 hours, at a concentration of 60 mg/L (Zühlke et al. 2020). Conversely, the low solubility of BPZ, BPAP, and BPPH made it impossible to investigate the degradation efficiency in Cupriavidus basilensis SBUG 290 (Zühlke et al. 2020). Investigations regarding the metabolic pathways for BP cleavage were published previously (Zühlke et al. 2020; Zühlke et al. 2017; Fischer et al. 2010). Due to space limitations, it will not be discussed in our review.
Finally, indigenous microorganisms were another relevant group of microorganisms investigated in the biodegradation of BP (Fig. 6). The biodegradation of BPA, BPB, BPE, BPP, and BPF by indigenous microorganisms was previously observed in freshwater (Ike et al. 2000; Ike et al. 2006; Kang and Kondo 2002a; Klecka et al. 2001). Accordingly, Zhou et al. (2020) reported that indigenous microorganisms were able to degrade BPA, BPE, BPB, BPZ, BPF, and BPM in the concentration of 0.1 mg/L in freshwater. Each bisphenol analogue presented different biodegradation efficiency. The analogue BPA, BPE, BPB, and BPZ showed 70% of degradation, although BPF and BPM degraded, respectively, 60% and 30% (Zhou et al. 2020). However, in the only study published on BPM, Zhou et al. (2020) suggested that the increased adsorption of BPM to humic acid can increase its degradability (Zhou et al. 2020).
Moreover, Frankowski et al. (2020) evaluated the biodegradation of BPAF and other five BP in riverine water and activated sludge, including BPA, BPF, BPS, BPB, and BPE (Frankowski et al. 2020). The biodegradation of indigenous microorganisms from activated sludge samples reached approximately 100% efficiency for BPA and BPF at the concentration of 10 mg/L. At this same concentration, biodegradation of BPS was between 40% and 50% and around 40% for BPB and BPE. However, Frankowski et al. (2020) observed that the degradation of bisphenol analogues by indigenous microorganisms in riverine water was inefficient. For example, the efficiency of BPAF biodegradation was less than 20% under the same conditions at the concentration of 10 mg/L (Frankowski et al. 2020). Likewise, Zhou et al. (2020) reported low degradability of BPAF. Indeed, Zhou et al. (2020) showed high persistence of BPAF in lake water, remaining practically unchanged after 49 days of monitoring (Zhou et al. 2020). However, BPAF showed the highest affinity for humic acid and activated sludge particles than BPA, BPS, BPB, and BPM (Zhou et al. 2020; Choi et al. 2019). In addition, the biodegradation of BPAF increased in the presence of humic acid (Zhou et al. 2020).
Regarding the biodegradation of BPS in water, Ike et al. (2006) could not detect its degradation in riverine water under aerobic conditions. Likewise, it was not detected in marine water within sixty days (Danz et al. 2009). BPS was also not degraded during 49 days in lake water (Zhou et al. 2020). This could indicate that BPM, BPS, and BPAF were not easily degraded in the water. Conversely, Wang et al. (2019b) reported that 99% of BPS at a concentration of 50 mg/L was degraded in 10 days by a consortium isolated from a sediment microbial community after 28-day of acclimation (Wang et al. 2019b). Indigenous microorganisms comprise the microbial community native to the environment. Consequently, the addition of pollutants like BPS or BPA can modify the composition, diversity, and abundance of these microbial communities. For example, BPA can favour bacterial groups resistant to xenobiotics and inhibit sensible ones (Huang et al. 2017; Xiong et al. 2017). Indeed, the 28-day acclimatization selected the bacteria tolerant to BPS that could use this BP as a substrate for growth, including Hyphomicrobium, Pandoraea, and Cupriavidus (Wang et al. 2019). A similar observation was found during biodegradation in a bioreactor (Huang et al. 2019). BPS was degraded in about 10 days and the microbial community was modified over this period. time. Accordingly, Huang et al. (2019) reported an increase in the abundance of bacteria associated with BPS degradation, including Pseudomonas, Devosia, Delftia, Acidovorax, and Rhodobacter.
In addition to the presence of xenobiotics, environmental conditions interfere with bacterial metabolisms (Elthouky et al. 2020; Gaylarde et al. 2005; Ren et al. 2016). Table 3 gathered literature data on temperature and pH optimal for BP degradation. However, investigations of the ideal conditions for bacterial degradation comprised only BPA, BPF, and BPS. Papers that assess the ability of bacterial strains to degrade different concentrations of BP other than BPA are still scarce. Several studies have already identified differences in the efficiency of BPA degradation according to changes in compound concentration (Babatar et al. 2019; Chang et al. 2011; Elthouky et al. 2020; Klecka et al. 2001; Li et al. 2012; Vijayalakshmi et al. 2018; Zhang et al. 2007). However, there are still few studies that investigate this difference in other bisphenol analogues.
Table 3
Optimal conditions of temperature (T) and pH for the bacterial biodegradation of bisphenol analogues in diverse environmental compartments.
Compound | Matrix | Microorganism | T (ºC) | pH | Reference |
BPA | river water | Indigenous microorganisms | 30 | 7 | Kang and Kondo 2002a |
BPA | water marine sediment | Pseudomonas sp. KU1 | n.d | 7 | Kamaraj et al. 2014 |
BPA | water marine sediment | Pseudomonas sp. KU2 | n.d | 7 | Kamaraj et al. 2014 |
BPA | water marine sediment | Bacillus sp. KU3 | n,d | 7 | Kamaraj et al. 2014 |
BPA | soil | Arthrobacter sp. YC-RL1 | 30 | 7 | Ren et al. 2016 |
BPA | soil | Pseudomonas putida YC-AE1 | 25–30 | 7,2 | Elthouky et al. 2020 |
BPA | soil | Pseudomonas sp. BG12 | n.d | 8 | Noszczyńska et al. 2020 |
BPA | river sediment | Sphingobium sp. YC-JY1 | 30 | 5,5–8 | Jia et al. 2020 |
BPA | river sediment | Bacillus sp. GZB | 37 | 7 | Li et al. 2012 |
BPA | solid waste leachate | Achromobacter xylosoxidans | 35 | 7 | Zhang et al. 2007 |
BPF | soil | consortium | 35 | 7 | Lu et al. 2017 |
BPS | river sediment | consortium | 30 | 7 | Wang et al. 2019 |
Legend: BPA - bisphenol A; BPF - bisphenol F; BPS - bisphenol S.