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Whole conversion of agro-industrial wastes rich in galactose-based carbohydrates into lipid using oleaginous yeast Aureobasidium namibiae
Biotechnology for Biofuels ( IF 6.1 ) Pub Date : 2021-09-15 , DOI: 10.1186/s13068-021-02031-8
Zhi-Peng Wang 1 , Xin-Yue Zhang 1 , Yan Ma 1 , Jing-Run Ye 1 , Jing Jiang 2 , Hai-Ying Wang 3 , Wei Chen 1
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Raw materials composed of easily assimilated monosaccharides have been employed as carbon source for production of microbial lipids. Nevertheless, agro-industrial wastes rich in galactose-based carbohydrates have not been introduced as feedstocks for oleaginous yeasts. In this study, Aureobasidium namibiae A12 was found to efficiently accumulate lipid from soy molasses and whey powder containing galactose-based carbohydrates, with lipid productions of 5.30 g/L and 5.23 g/L, respectively. Over 80% of the fatty acids was C16:0, C18:0, C18:1, and C18:2. All kinds of single sugar components in the two byproducts were readily converted into lipids, with yields ranging between 0.116 g/g and 0.138 g/g. Three α-galactosidases and five β-galactosidases in the strain were cloned and analyzed. Changes of transcriptional levels indicated GalB and GalC were key α-galactosidases, and GalG was key β-galactosidase. In 10 L fermentor, lipid production from SM and WP achieved 6.45 g/L and 6.13 g/L, respectively. β-galactosidase was responsible for lactose hydrolysis; sucrase and α-galactosidase both contributed to the efficient hydrolysis of raffinose and stachyose in a cooperation manner. This is a new way to produce lipids from raw materials containing galactose-based carbohydrates. This finding revealed the significance of sucrase in the direct hydrolysis of galactose-based carbohydrates in raw materials for the first time and facilitated the understanding of the efficient utilization of galactose-based carbohydrates to manufacture lipid or other chemicals in bioprocess.

中文翻译:

使用含油酵母 Aureobasidium 纳米比亚将富含半乳糖碳水化合物的农业工业废物完全转化为脂质

由易于同化的单糖组成的原料已被用作生产微生物脂质的碳源。然而,富含基于半乳糖的碳水化合物的农业工业废物尚未被引入作为产油酵母的原料。在这项研究中,发现 Aureobasidium nmamibiae A12 可以有效地从含有半乳糖基碳水化合物的大豆糖蜜和乳清粉中积累脂质,脂质产量分别为 5.30 g/L 和 5.23 g/L。超过 80% 的脂肪酸是 C16:0、C18:0、C18:1 和 C18:2。两种副产品中的各种单糖成分都很容易转化为脂质,产量在 0.116 g/g 和 0.138 g/g 之间。克隆并分析了菌株中的三种α-半乳糖苷酶和五种β-半乳糖苷酶。转录水平的变化表明GalB和GalC是关键的α-半乳糖苷酶,而GalG是关键的β-半乳糖苷酶。在 10 L 发酵罐中,SM 和 WP 的脂质产量分别达到 6.45 g/L 和 6.13 g/L。β-半乳糖苷酶负责乳糖水解;蔗糖酶和α-半乳糖苷酶都以协同方式促进棉子糖和水苏糖的有效水解。这是一种从含有半乳糖基碳水化合物的原料中生产脂质的新方法。这一发现首次揭示了蔗糖酶在原料中半乳糖基碳水化合物直接水解中的重要性,并促进了对半乳糖基碳水化合物在生物过程中生产脂质或其他化学品的有效利用的理解。在 10 L 发酵罐中,SM 和 WP 的脂质产量分别达到 6.45 g/L 和 6.13 g/L。β-半乳糖苷酶负责乳糖水解;蔗糖酶和α-半乳糖苷酶都以协同方式促进棉子糖和水苏糖的有效水解。这是一种从含有半乳糖基碳水化合物的原料中生产脂质的新方法。这一发现首次揭示了蔗糖酶在原料中半乳糖基碳水化合物直接水解中的重要性,并促进了对半乳糖基碳水化合物在生物过程中生产脂质或其他化学品的有效利用的理解。在 10 L 发酵罐中,SM 和 WP 的脂质产量分别达到 6.45 g/L 和 6.13 g/L。β-半乳糖苷酶负责乳糖水解;蔗糖酶和α-半乳糖苷酶都以协同方式促进棉子糖和水苏糖的有效水解。这是一种从含有半乳糖基碳水化合物的原料中生产脂质的新方法。这一发现首次揭示了蔗糖酶在原料中半乳糖基碳水化合物直接水解中的重要性,并促进了对半乳糖基碳水化合物在生物过程中生产脂质或其他化学品的有效利用的理解。蔗糖酶和α-半乳糖苷酶都以协同方式促进棉子糖和水苏糖的有效水解。这是一种从含有半乳糖基碳水化合物的原料中生产脂质的新方法。这一发现首次揭示了蔗糖酶在原料中半乳糖基碳水化合物直接水解中的重要性,并促进了对半乳糖基碳水化合物在生物过程中生产脂质或其他化学品的有效利用的理解。蔗糖酶和α-半乳糖苷酶都以协同方式促进棉子糖和水苏糖的有效水解。这是一种从含有半乳糖基碳水化合物的原料中生产脂质的新方法。这一发现首次揭示了蔗糖酶在原料中半乳糖基碳水化合物直接水解中的重要性,并促进了对半乳糖基碳水化合物在生物过程中生产脂质或其他化学品的有效利用的理解。
更新日期:2021-09-15
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