Buckwheat waste depolymerization using a subcritical ethanol solution for extraction of bioactive components: from the laboratory to pilot scale
Buckwheat waste depolymerization using a subcritical ethanol solution for extraction of bioactive components: from the laboratory to pilot scale
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DOI：
10.1016/j.jece.2023.109807
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发表时间：
2023-03
影响因子：
7.7
通讯作者：
Yongheng Yuan;N. Shimizu;Faqi Li;Jorge Magaña;Xiaojue Li
中科院分区：
文献类型：
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作者：
Yongheng Yuan;N. Shimizu;Faqi Li;Jorge Magaña;Xiaojue Li
荞麦废弃物富含抗氧化剂和抗氧化剂等生物活性成分。为了有效地提取这些化合物，亚临界乙醇溶液处理（SEST）进行了从实验室到中试规模。在实验室规模下评价了在80 °C下用热水和乙醇溶液以及在120 °C下用亚临界水和亚临界乙醇溶液的提取。然后，使用体积比例因子为1000的间歇式反应器将SEST按比例放大至中试水平。木质素的降解和抽出物的溶解增加了总酚的产率。温度的升高导致部分黄酮类成分的降解。由于提取温度较低，还原糖主要以多糖形式存在。在亚临界条件下，水和乙醇表现出协同效应，在保留纤维素和半纤维素的同时，比水热提取法降解更多的木质素，提取更多的生物活性成分。在中试试验中，总酚、总黄酮和总还原糖的得率分别为29.8 ± 0.1、13.9 ± 0.5和33.9 ± 0.5g/kg。通过SEST获得的液体样品的浊度和白利糖度值高，因为BW的结构的破坏和生物活性成分的溶解。此外，与实验室规模相比，由于更大的原料均匀性和设备参数，中试规模获得了更好的结果。SEST是一种很有前途的方法，可用于中试规模的去牛体重和提取生物活性成分。
Buckwheat waste (BW) is rich in bioactive components such as antioxidants and saccharides. To effectively extract these compounds, subcritical ethanol solution treatment (SEST) was conducted from laboratory to pilot scale. Extraction at 80 °C with hot water and ethanol solutions, and at 120 °C with subcritical water and subcritical ethanol solutions were evaluated in laboratory scale. Then, the SEST was scaled up to the pilot level using a batch reactor with a volume scale factor of 1000. Degradation of lignin and dissolution of extractives increased the total phenolics yield. The increase in the temperature led to the degradation of some flavonoid components. Reducing sugars were mainly present as polysaccharides because of the low extraction temperature. Water and ethanol exhibited synergistic effects under subcritical conditions, which resulted in degradation of more lignin and extraction of more bioactive components than hydrothermal extraction, while retaining cellulose and hemicellulose. In the pilot-scale experiment, the total yields of phenolics, flavonoids, and reducing sugars were 29.8 ± 0.1, 13.9 ± 0.5, and 33.9 ± 0.5 g/kg, respectively. The turbidity and Brix values of the liquid samples obtained by SEST were high because of breakdown of the structure of the BW and the dissolution of the bioactive components. Additionally, compared with the laboratory scale, better results were obtained on the pilot scale because of greater feedstock homogeneity and equipment parameters. SEST is a promising approach that could be used on the pilot scale to depolymerize BW and extract bioactive components.