Role of psychrotrophic bacteria and cold-active enzymes in composting methods adopted in cold regions

Manyapu, Vivek; Lepcha, Ayush; Sharma, Sanjeev; Kumar, Rakshak

doi:10.1016/bs.aambs.2022.08.001

Cited by 10 publications

(3 citation statements)

References 66 publications

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“…Pseudomonas is a widely distributed and cold-tolerant bacteria that is associated with infections and mostly acts as a cause of spoiling (Gram et al, 2002;Manyapu., 2022). Leuconostoc, Lactococcus, and Lactobacillus are types of lactic acid bacteria that plays a prominent role in the spoilage of salads, which ultimately reduces the shelf life of the product (Gram et al, 2002;Lim et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

Microbial Diversity and Quality of Ready-to-Eat Salad: An Underexplored Area of Local Hotels

Chakrovarty,

Mondal,

Kador

et al. 2024

Preprint

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Ready-to-eat salads, celebrated for their myriad health benefits, have become a ubiquitous dietary choice. However, concerns have surged in light of recent illness outbreaks linked to consumption of raw salads. In response, this study aimed to assess the microbiological quality of ready-to-eat salad, focusing on shelf-life estimation and microbiome characterization. A random sample of twelve salads went through comprehensive microbiological analysis and 16S rRNA metagenomic profiling. The salads appear to be potentially hazardous for ingestion based on the mean values of 7.66 log cfu/gm for aerobic mesophilic count and 7.33 log cfu/gm for psychrotrophic count. In addition, total coliform and Enterobacteriaceae were found (mean 3.66 log cfu/gm for both), but fecal coliform was completely absent. Firmicutes (47.18%), Cyanobacteria (28.19%), Proteobacteria (23.24%), Bacteriodetes (0.88%), and Actinobacteria (0.41%) were the top five phyla discovered. Of the salad samples, Weissella (54.86%) seems to be the most prevalent genus. Notably, genera such as Pseudomonas, Acinetobacter, and Enterobacter, potential human pathogens, exhibited more than 1% abundance. Additionally, spoilage-associated LAB organisms, including Leuconostoc and Lactobacillus, and Lactococcus were detected. Furthermore, with the exception of Weissella, the majority of the species showed a positive correlation between protein concentration and spoilage. Increased pH levels and elevated moisture content create favorable conditions for the proliferation of specific pathogens, consequently diminishing the shelf life of the salad. Additional research is necessary to fully grasp the intricacies of the microbiome in salads and to establish protocols that uphold quality standards and ensure the protection of public health.

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Section: Discussionmentioning

confidence: 99%

Microbial Diversity and Quality of Ready-to-Eat Salad: An Underexplored Area of Local Hotels

Chakrovarty,

Mondal,

Kador

et al. 2024

Preprint

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“…( 2012 ). This enzymatic system is highly efficient in the oxidation of both phenolic and nonphenolic components of lignin (Debnath & Saha, 2020 ; Manyapu et al., 2022 ). Moreover, P. chrysogenum exhibited β‐glucosidase activity.…”

Section: Discussionmentioning

confidence: 99%

Optimizing fungal treatment of lignocellulosic agro‐industrial by‐products to enhance their nutritional value

Benaddou,

Hajjaj,

Allali

et al. 2024

Food Science & Nutrition

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This study delves into the dynamic interaction between various fungal strains, substrates, and treatment durations to optimize the nutritional value of these by‐products. Six fungi, including Penicillium chrysogenum, Fusarium sp., Fusarium oxysporum, Fusarium solani, Penicillium crustosum, and Cosmospora viridescens, were evaluated across three substrates: wheat straw (WS), cedar sawdust (CW), and olive pomace (OP) over treatment periods of 4, 8, and 12 weeks. The study discerned profound impacts of these fungi across multiple parameters, including cellulose variation (C.var), lignin variation (L.var), and in vitro true digestibility variation (IVTD.var). Our results demonstrated that the various fungi had a significant effect on all parameters (p < .001). Noteworthy, F. oxysporum and F. solani emerged as exemplars, displaying notable lignin degradation, cellulose liberation, and IVTD enhancement. Importantly, P. crustosum demonstrated substantial cellulose degradation, exhibiting optimal efficacy in just 4 weeks for all substrates. Notably, F. sp. excelled, yielding favorable results when treating WS. P. chrysogenum achieved optimal outcomes with 8‐week treatment for WS. Both Fusarium sp. and P. chrysogenum exhibited slight cellulose release, with remarkable reduction of WS lignin compared to other substrates. Especially, WS and OP displayed superior digestibility enhancements relative to CW. It should be noted that the treatment duration further shaped these outcomes, as prolonged treatment (12 weeks) fostered greater benefits in lignin degradation and digestibility, albeit with concomitant cellulose degradation. These findings underscore the intricate balance between fungal strains, substrates, and treatment durations in optimizing the nutritional value of lignocellulosic agro‐industrial by‐products. The outcomes of this study lead to the enhancement in the overall value of by‐products, promoting sustainable livestock feed and advancing agricultural sustainability.

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“…Each method applies specific conditions and requirements to ensure efficient and environmentally responsible organic waste management. The choice of method will be based on the volume and type of the feedstock, available space, time required for monitoring and maintenance, cost, intended use of the compost, odour control requirements, environmental goals, and regulations [39,40].…”

mentioning

confidence: 99%

Challenges and Remediation Strategies for Per- and Polyfluoroalkyl Substances (PFAS) Contamination in Composting

Khair Biek,

Khudur,

Ball

2024

Sustainability

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Municipal solid waste (MSW) is projected to rise to 3.4 billion tonnes by 2050, with only 33% undergoing environmentally friendly management practices. Achieving a circular economy involves sustainable approaches, among which diverting waste from landfills to composting plays a crucial role. However, many of the products society uses and discards in MSW daily contain per- and polyfluoroalkyl substances (PFAS), raising concerns that composts may inadvertently introduce PFAS into the environment, posing a significant challenge to waste management and environmental sustainability. PFAS have been detected in compost at concentrations ranging between 1.26–11.84 µg/kg. Composts are therefore a source of PFAS contamination, posing risks to human and ecosystem health. Impactful technologies are therefore required for PFAS remediation during the composting process. This review examines the composting process as a sustainable organic waste management technology, examining the various systems employed, compost quality, and uses, particularly emphasising the challenge posed by PFAS contamination. The review provides novel insights into possible PFAS remediation technologies. A comprehensive understanding of PFAS origin, fate, and transformation during the composting process is lacking, creating substantial knowledge gaps regarding the inputs processes contributing most to PFAS accumulation in the final product. Addressing these gaps in future studies is crucial for minimising PFAS discharge into the environment and developing an effective remediation approach. This review highlights the urgent need for innovative solutions to mitigate PFAS contamination in compost and the importance of advancing research and technology to achieve sustainable waste management objectives.

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Role of psychrotrophic bacteria and cold-active enzymes in composting methods adopted in cold regions

Cited by 10 publications

References 66 publications

Microbial Diversity and Quality of Ready-to-Eat Salad: An Underexplored Area of Local Hotels

Microbial Diversity and Quality of Ready-to-Eat Salad: An Underexplored Area of Local Hotels

Optimizing fungal treatment of lignocellulosic agro‐industrial by‐products to enhance their nutritional value

Challenges and Remediation Strategies for Per- and Polyfluoroalkyl Substances (PFAS) Contamination in Composting

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