Integrated Soybean Hull Biorefinery with Citric Acid-Catalyzed Hydrothermal Pretreatment for L-Lactic Acid and Xylooligosaccharide Production

IF 3.1 3区工程技术 Q3 ENERGY & FUELS BioEnergy Research Pub Date : 2024-01-05 DOI:10.1007/s12155-023-10714-3

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Abstract

The main objective of this study was to develop a citric acid-catalyzed hydrothermal pretreatment to reach the maximum sugar recovery from soybean hull (SH), in the context of a biorefi nery concept. A central composite design (CCD) was used to optimize pretreatment conditions through the analysis of citric acid concentration, time, and temperature effects. Optimized conditions were defined as 3.56% w/w, 46.1 min, and 135.7 °C. From the solid fraction, 99.5% and 83.0% of glucose and xylose conversion, respectively, were obtained after enzymatic hydrolysis. Sugars were fermented successfully to L-lactic acid by Lactobacillus pentosus. In fact, SH hydrolysate presented no trace of inhibitor compounds, and glucose was totally consumed during fermentation. After 24 h of fermentation, a conversion rate of 0.724 g/g of sugars to lactic acid and 80.5% of the stoichiometric theoretical yield were reached. In addition, from the liquid fraction, 47.8 mg/g of xylooligosaccharides (XOS) was produced. This work demonstrates the potential of SH to be exploited as feedstock, with mild and efficient pretreatment process, for medium- to high-value bioproducts production in biorefineries.

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利用柠檬酸催化水热预处理生产 L-乳酸和低聚木糖的综合大豆壳生物精炼厂

摘要本研究的主要目的是开发一种柠檬酸催化的水热预处理方法，以便在生物发酵概念下最大限度地回收大豆壳（SH）中的糖分。通过分析柠檬酸浓度、时间和温度的影响，采用中心复合设计（CCD）优化预处理条件。优化条件为 3.56% w/w、46.1 分钟和 135.7 °C。酶水解后，固体部分的葡萄糖和木糖转化率分别为 99.5% 和 83.0%。糖类在戊糖乳杆菌的作用下成功发酵成 L-乳酸。事实上，SH水解物中没有任何抑制化合物，葡萄糖在发酵过程中被完全消耗。发酵 24 小时后，每克糖的乳酸转化率为 0.724 克，理论产量为 80.5%。此外，从液体部分还产生了 47.8 毫克/克的木寡糖（XOS）。这项工作表明，SH 具有作为原料的潜力，通过温和高效的预处理工艺，可在生物炼制厂中生产中高价值的生物产品。

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来源期刊

BioEnergy Research ENERGY & FUELS-ENVIRONMENTAL SCIENCES

CiteScore

6.70

自引率

8.30%

发文量

174

审稿时长

3 months

期刊介绍： BioEnergy Research fills a void in the rapidly growing area of feedstock biology research related to biomass, biofuels, and bioenergy. The journal publishes a wide range of articles, including peer-reviewed scientific research, reviews, perspectives and commentary, industry news, and government policy updates. Its coverage brings together a uniquely broad combination of disciplines with a common focus on feedstock biology and science, related to biomass, biofeedstock, and bioenergy production.