Screening and optimization of Manganese peroxidase (MnP) production by Pseudoduganella violacea (SMB4), a bacterial isolate from Similipal Biosphere Reserve, Odisha and evaluation of Maillard reaction products degradation

oleh: Nitish Kumar Kheti, Subhashree Rath, Hrudayanath Thatoi

Format: Article
Diterbitkan: Elsevier 2023-08-01

Deskripsi

The Maillard reaction products (Melanoidin) are major environmental pollutants of the distillery and fermentation industries. Manganese peroxidase (MnP) was found to be an efficient ligninolytic enzyme capable of degrading Maillard products. MnP can convert Mn2 ions in wood and soils to the more reactive Mn2+ ions. The current study aims to isolate MnP producing bacteria from Similipal Biosphere Reserve (SBR), Odisha, and determine its biodegradation ability towards millards products. In total 10 ligninolytic bacterial colonies were isolated from the soil sample of SBR and their MnP activity was screened using phenol red dye as an indicator. The isolate, SMB4 was found to be the most efficient MnP-producing bacterium showing the highest MnP activity of 3.89 U/ml/min in un-optimized conditions. The bacterium was identified as Pseudoduganella violacea based on morphological, biochemical and molecular characterization. MnP activity of SMB4 was optimized using response surface methodology. Under optimized conditions SMB4 showed MnP activity of 6.12 U/ml/min which is 1.57 times from un-optimized condition. The isolate SMB4 was found to show significant decolorization of maillards products up to 83.68 % at temperature 37 °C within 192 h of incubation. The degraded product was analyzed using UV–vis and FTIR analyses. The current investigation suggests that MnP produced by Pseudoduganella violacea may be successfully exploited for bioremediation purposes to degrade Maillard products.