Influence of rice straw-derived dissolved organic matter on lactic acid fermentation by Rhizopus oryzae

Chen, Xingxuan; Wang, Xiahui; Xue, Yiyun; Zhang, Tian-Ao; Li, Yuhao; Hu, Jiajun; Tsang, Yiu Fai; Zhang, Hongsheng; Gao, Min-Tian

doi:10.1016/j.jbiosc.2018.01.004

Cited by 24 publications

(5 citation statements)

References 36 publications

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“…Commonly, there are two ways to conduct the following saccharification: (1) by first separating the rice straw from the pretreatment liquid, followed by saccharification of the solid fraction, and (2) by saccharification of the rice straw without separation. The latter method could bring about a decrease in fermentation efficiency due to the presence of phenolic compounds and other inhibitors formed during the pretreatments, while the former method could result in the discharge of residual stream, which has a high total organic carbon (TOC) value, containing polysaccharides and polyphenols [ 14 ]. In a common viewpoint of bioconversion of lignocellulosic biomass to useful materials, higher temperature and acid/alkaline concentration leads to larger release of inhibitors, resulting in poorer performance of the subsequent process.…”

Section: Introductionmentioning

confidence: 99%

Tapping the Bioactivity Potential of Residual Stream from Its Pretreatments May Be a Green Strategy for Low-Cost Bioconversion of Rice Straw

Chen

Wang

Xue

et al. 2018

Appl Biochem Biotechnol

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In this study, it was found that the residual stream from pretreatments of rice straw exhibited high antioxidant activity. Assays based on the Folin–Ciocalteu colorimetric method confirmed that the residual stream contained large amounts of phenolic compounds. Three antioxidant assays were employed to evaluate the bioactivity of the residual stream. Strong linear correlations existed among the release of phenolic compounds, saccharification efficiency, and antioxidant activity. The alkaline pretreatment provided a much greater release of phenolic compounds, especially phenolic acids, compared to the acid pretreatment, and consequently, it had stronger linear correlations than the acid pretreatment. Antibacterial experiments demonstrated the ability of the phenolic compounds in the residual stream to inhibit the growth of microorganisms, indicating the potential of these compounds as antimicrobial agents. To discuss the possibility of the co-production of antimicrobial agents and biofuels/biochemicals, both acid and alkaline pretreatments were optimized using response surface methodology. Under the optimal conditions, 285.7 g glucose could be produced from 1 kg rice straw with the co-production of 3.84 g FA and 6.98 g p-CA after alkaline pretreatment. These results show that the recovery of phenolic compounds from the residual stream could be a green strategy for the low-cost bioconversion of rice straw.Electronic supplementary materialThe online version of this article (10.1007/s12010-018-2751-1) contains supplementary material, which is available to authorized users.

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Section: Introductionmentioning

confidence: 99%

Tapping the Bioactivity Potential of Residual Stream from Its Pretreatments May Be a Green Strategy for Low-Cost Bioconversion of Rice Straw

Chen

Wang

Xue

et al. 2018

Appl Biochem Biotechnol

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“…Likewise, in another study where rice straw was used to obtain lactic acid by R. oryzae , only a small amount of lactic acid is produced even though R. oryzae can consume glucose in rice straw-derived hydrolysates. The inhibitory effect of polyphenols in rice straw-derived dissolved organic matter was found to be responsible for ineffective lactic acid production [21].…”

Section: Discussionmentioning

confidence: 99%

Potato Peel Waste Fermentation by Rhizopus oryzae to Produce Lactic Acid and Ethanol

Uyar

2023

Preprint

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Potato peel waste (PPW), a zero-value byproduct generated from potato processing, is a promising fermentation substrate due to its large quantity of starch, non-starch polysaccharide, lignin, protein, and lipid. Rhizopus oryzae is a filamentous fungus that is mainly known as a lactic acid producer and can ferment various agro-wastes. This study aimed to use R. oryzae for the fermentation of PPW. A series of batch fermentations were conducted to investigate the effects of different PPW loading rates (2 – 8%) and particle sizes (0 – 4mm). Under an initial PPW loading rate of 8% and particle size of 1 – 2mm, the maximum ethanol (23.9 mL/L) and lactic acid (2.60 mL/L) concentrations, the highest ethanol (11.93 mL/L•day) and lactic acid (1.56 mL/L•day) maximum production rates were obtained. Under these conditions, the yield of ethanol and lactic acid were 298 mL/mgPPW and 33 mL/mgPPW, respectively. R. oryzae was shown to utilize PPW as a substrate to produce value-added bioproducts such as ethanol (major product) and lactic acid.

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“…Members of this genus have the advantage of producing only L-lactic acid isomers, thus reducing the cost associated with the purification of the fermentation products. Although glucose is preferred as a carbon source for producing lactic acid using Rhizopus strains, other substrates such as raw starch from potatoes, cassava, wheat, corn, and rice wastes [ 147 , 148 , 149 , 150 ] or lignocellulose wastes [ 151 , 152 , 153 ] can contribute to cost reduction [ 146 ]. Malic and fumaric acids are other valuable organic acids that can be obtained using fungal strains.…”

Section: Significance Of Fungi In Different Sectorsmentioning

confidence: 99%

Current Insights in Fungal Importance—A Comprehensive Review

et al. 2023

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Besides plants and animals, the Fungi kingdom describes several species characterized by various forms and applications. They can be found in all habitats and play an essential role in the excellent functioning of the ecosystem, for example, as decomposers of plant material for the cycling of carbon and nutrients or as symbionts of plants. Furthermore, fungi have been used in many sectors for centuries, from producing food, beverages, and medications. Recently, they have gained significant recognition for protecting the environment, agriculture, and several industrial applications. The current article intends to review the beneficial roles of fungi used for a vast range of applications, such as the production of several enzymes and pigments, applications regarding food and pharmaceutical industries, the environment, and research domains, as well as the negative impacts of fungi (secondary metabolites production, etiological agents of diseases in plants, animals, and humans, as well as deteriogenic agents).

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Influence of rice straw-derived dissolved organic matter on lactic acid fermentation by Rhizopus oryzae

Cited by 24 publications

References 36 publications

Tapping the Bioactivity Potential of Residual Stream from Its Pretreatments May Be a Green Strategy for Low-Cost Bioconversion of Rice Straw

Tapping the Bioactivity Potential of Residual Stream from Its Pretreatments May Be a Green Strategy for Low-Cost Bioconversion of Rice Straw

Potato Peel Waste Fermentation by Rhizopus oryzae to Produce Lactic Acid and Ethanol

Current Insights in Fungal Importance—A Comprehensive Review

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