Biodegradation of microcystin analogues by Stenotrophomonas maltophilia isolated from Beira Lake Sri Lanka

Idroos, F.S.; Silva, Bgdnk De; Manage, P.M.

doi:10.4038/jnsfsr.v45i2.8175

Cited by 14 publications

(13 citation statements)

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“…KKU-25s also decomposed [Dha (7)]MC-LR within 24 h [96]. Further Stenotrophomonas maltophilia 4B4 showed total MC-LR removed within 10 days while MC-RR and MC-LF elimination occurred within 12 and 14 days respectively [16]. In a recent publication, a novel bacteria strain YF1 of the genus Sphingopyxis indicated thorough MC-LR degradation within 120 min [123].…”

Section: Biological Degradation By Bacteriamentioning

confidence: 94%

“…The presence of these toxins may reduce water quality, accumulate and magnify in food chains, and bring about significant negative effects on human health and animals [7][8][9][10]. Of the numerous cyanobacterial toxins discovered, microcystins (MCs) are classified as hepatotoxic and potentially carcinogenic [11], most often present in water [12] and extensively studied in terms of degradation and removal [13][14][15][16][17]. Thus this review focuses on toxic effects and bacterial degradation of MCs.…”

Section: Introductionmentioning

confidence: 99%

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A Mini Review on Microcystins and Bacterial Degradation

Massey

Yang

2020

Toxins

104

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Microcystins (MCs) classified as hepatotoxic and carcinogenic are the most commonly reported cyanobacterial toxins found in the environment. Microcystis sp. possessing a series of MC synthesis genes (mcyA-mcyJ) are well documented for their excessive abundance, numerous bloom occurrences and MC producing capacity. About 246 variants of MC which exert severe animal and human health hazards through the inhibition of protein phosphatases (PP1 and PP2A) have been characterized. To minimize and prevent MC health consequences, the World Health Organization proposed 1 µg/L MC guidelines for safe drinking water quality. Further the utilization of bacteria that represent a promising biological treatment approach to degrade and remove MC from water bodies without harming the environment has gained global attention. Thus the present review described toxic effects and bacterial degradation of MCs.

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Section: Biological Degradation By Bacteriamentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

A Mini Review on Microcystins and Bacterial Degradation

Massey

Yang

2020

Toxins

104

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“…Lower bacterial activity in the presence of nutrients was attributed to the formation of microcystin metabolic products, resulting in reduced enzymatic activity of microcystin-degrading bacteria. However, in a recent study by (Idroos et al, 2017), it was shown that the presence of phosphate and nitrate ions enhanced the biodegradation rate of MC-LR (phosphate: 0.02 ppm increased degradation rate from 0.3 µg/ d to 0.4 µg/d (33% increase) while nitrate ions increased the degradation rate by almost 100% (from 0.2 to 0.4 µg/d) at nitrate concentration of 0.45 ppm. In general, under the nutrient conditions, bacterial biofilm can even sustain their degradation activity during winter.…”

Section: Biodegradation Of Cyanotoxins: the Effect Of Environmental Cmentioning

confidence: 90%

Potential of biological approaches for cyanotoxin removal from drinking water: A review

Kumar

Hegde

Brar

et al. 2019

Ecotoxicology and Environmental Safety

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Biological treatment of cyanotoxins has gained much importance in recent decades and holds a promise to work in coordination with various physicochemical treatments. In drinking water treatment plants (DWTPs), effective removal of cyanotoxins with reduced toxicity is a primary concern. Commonly used treatments, such as ozonation, chlorination or activated carbon, undergo significant changes in their operating conditions (mainly dosage) to counter the variation in different environmental parameters, such as pH, temperature, and high cyanotoxin concentration. Presence of metal ions, natural organic matter (NOM), and other chemicals demand higher dosage and hence affect the activation energy to efficiently break down the cyanotoxin molecule. Due to these higher dose requirements, the treatment leads to the formation of toxic metabolites at a concentration high enough to break the guideline values. Biological methods of cyanotoxin removal proceed via enzymatic pathway where the protein-encoding genes are often responsible for the compound breakdown into non-toxic metabolites. However, in contrast to the chemical treatment, the biological processes advance at a much slower kinetic rate, predominantly due to a longer onset period (high lag phase). In fact, more than 90% of the studies reported on the biological degradation of the cyanotoxins attribute the biodegradation to the bacterial suspension. This suspended growth limits the mass transfer kinetics due to the presence of metal ions, NOMs and, other oxidizable matter, which further prolongs the lag phase and makes biological process toxic-free, albeit less efficient. In this context, this review attempts to bring out the importance of the attached growth mechanism, in particular, the biofilm-based treatment approaches which can enhance the biodegradation rate.

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“…Groundwater and surface water are widely used as drinking water sources in most countries of the world (Mahagamage et al, 2015;Idroos et al, 2017). However, many studies have recorded a remarkable increase of nitrates in groundwater aquifers and surface water bodies (Wang et al, 2009;Aopreeya et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Microbial Degradation of Nitrate: Put Microbes to Work

Gunasekara¹,

Idroos²,

Pathmalal³

2018

Environ. Nat. Resour. J.

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Three nitrate degrading bacteria, namely S1, S2 and S3 strains, were isolated from soil samples collected from agricultural sites at Polonnaruwa, Oruwala and Gampaha, Sri Lanka respectively. Among the isolated strains, S1 showed a maximum nitrate removal rate of 4.20±0.08 mg/L/day whereas S2 and S3 showed nitrate removal rates of 3.45±0.57 mg/L/day and 3.72±0.19 mg/L/day, respectively. The nitrate removal abilities of all three strains were measured at different temperatures (25 o C, 30 o C, 32 o C), different pH (7.0, 7.5, 8.0) and for different nitrate concentrations (15, 30, 45 mg/L) in vitro. The maximum nitrate degrading rate by the bacterium S1 (4.52±0.01 mg/L/day), S2 (4.25±0.47 mg/L/day) and S3 (4.04±0.09 mg/L/day) were detected at 32ºC whereas the highest degradation rate for S1 (4.6±0.05 mg/L/day), S2 (4.38±0.03 mg/L/day) and S3 (4.14±0.25 mg/L/day) bacteria strains was reported when the pH was 8.0. The maximum nitrate degradation was found to be 5.88±0.17, 5.67±0.45 and 5.71±0.43 mg/L/day for S1, S2 and S3 bacteria strains when 45 mg/L of nitrate was present in the medium. A biochemical test tentatively identified the isolates S1, S2 and S3 as Pseudomonas sp., Bacillus sp. and Proteus sp. The bio sand filter developed in cooperating all three bacterial strains showed 6.12±0.06 mg/L/day of nitrate degradation rate within 24 hours.

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Biodegradation of microcystin analogues by Stenotrophomonas maltophilia isolated from Beira Lake Sri Lanka

Cited by 14 publications

References 0 publications

A Mini Review on Microcystins and Bacterial Degradation

A Mini Review on Microcystins and Bacterial Degradation

Potential of biological approaches for cyanotoxin removal from drinking water: A review

Microbial Degradation of Nitrate: Put Microbes to Work

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