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Differences of Rhizopus oryzae strains in organic acid synthesis and fatty acid composition

机译：米根霉菌株在有机酸合成和脂肪酸组成上的差异

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摘要

Two groups of 15 Rhizopus oryzae strains were grown in a liquid medium to analyse metabolic products such as lactic, fumaric, malic and other organic acids and ethanol. Group A produced a large amount of lactic acid, while group B produced a small amount. The addition of calcium carbonate to the medium of group A stimulated the production of lactic acid, but not fumaric and malic acids. As compared with group A, organic acids were only slightly synthesized in group B. Fumaric and malic acids appeared in the medium of group B, which was supplemented with calcium carbonate, but lactic acid was not detected. Myristic, palmitic, palmitoleic, oleic, stearic, linoleic and γ-linolenic acids were determined for total lipids extracted from the fungal cells and subjected to principal component analysis. Group A contained high amounts of unsaturated fatty acids and differed from group B in the proportion of palmitic and γ-linolenic acids. The content of γ-linolenic acid increased by the addition of lactic acid to the medium and not by those of ethanol and NaCl. The physiological differences in R. oryzae strains may depend on the productivity of organic acids, reflecting the composition of fatty acids.
机译：将两组15株米根霉菌株在液体培养基中生长，以分析代谢产物，例如乳酸，富马酸，苹果酸及其他有机酸和乙醇。 A组产生大量乳酸，而B组产生少量乳酸。向组A的介质中添加碳酸钙会刺激乳酸的生成，但不会刺激富马酸和苹果酸。与A组相比，B组仅合成了少量有机酸。B组的培养基中存在富马酸和苹果酸，并补充了碳酸钙，但未检出乳酸。测定从真菌细胞提取的总脂质的肉豆蔻酸，棕榈酸，棕榈油酸，油酸，硬脂酸，亚油酸和γ-亚麻酸，并进行主成分分析。 A组含有大量不饱和脂肪酸，与B组的棕榈酸和γ-亚麻酸比例不同。 γ-亚麻酸的含量通过向培养基中添加乳酸而不是乙醇和NaCl的含量而增加。米曲霉菌株的生理差异可能取决于有机酸的生产率，反映了脂肪酸的组成。

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