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Effects of fundamental nutrient stresses on the lipid accumulation profiles in two diatom species Thalassiosira weissflogii and Chaetoceros muelleri

机译:基本营养胁迫对两种硅藻Thalasiosira weissflogii和Chaetoceros muelleri脂质积累特征的影响

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摘要

Microalgae are considered as attractive feedstocks for biofuel production nowadays because of their high lipid contents and easy cultivation. In the present study, two diatoms, Thalassiosira weissflogii and Chaetoceros muelleri, were cultured under various nutrient-limitation conditions to explore their comprehensive lipid accumulation profiles for further commercialization. In T. weissflogii, the highest neutral lipid accumulation and highest lipid productivity (14.28 mg L-1 day(-1)) were both recorded under P-limitation. In C. muelleri, the highest lipid content (35.03% of dry cell weight), highest neutral lipid accumulation, and highest lipid productivity (29.07 mg L-1 day(-1)) were all recorded under N-limitation. Besides, the predominant fatty acids of T. weissflogii and C. muelleri were myristic acid (C14:0), palmitic acid (C16:0), and palmitoleic acid (C16:1), with the amounts of 58.4-74.4 and 74.1-87.7% of the total fatty acids, respectively. Moreover, nutrient limitations led to a lower proportion of polyunsaturated fatty acids (PUFA) than that of saturated fatty acid (SFA) and monounsaturated fatty acid (MUFA) in both species. The ratios of (SFA + MUFA) to PUFA were from 1.65 to 3.01 in T. weissflogii, and up to 3.61 to 8.59 in C. muelleri. Our results suggested the feasibility of C. muelleri as biodiesel feedstock due to its more suitable fatty acid composition and higher lipid productivity compared to T. weissflogii.
机译:微藻由于其高脂质含量和易于培养而被认为是当今用于生物燃料生产的有吸引力的原料。在本研究中,在多种营养限制条件下培养了两个硅藻,Thalasiosira weissflogii和Chaetoceros muelleri,以探索其全面的脂质蓄积特征,以进一步商业化。在T. weissflogii中,最高中性脂质积累和最高脂质生产率(14.28 mg L-1天(-1))均在P限制下记录。在C. muelleri中,最高脂质含量(占干细胞重量的35.03%),最高中性脂质积累和最高脂质生产率(29.07 mg L-1天(-1))均在N限制下记录。此外,T。weissflogii和C. muelleri的主要脂肪酸是肉豆蔻酸(C14:0),棕榈酸(C16:0)和棕榈油酸(C16:1),含量分别为58.4-74.4和74.1-脂肪酸总量分别为87.7%。此外,在两个物种中,营养限制导致多不饱和脂肪酸(PUFA)的比例低于饱和脂肪酸(SFA)和单不饱和脂肪酸(MUFA)的比例。在魏氏木霉中,(SFA + MUFA)与PUFA的比率在1.65至3.01之间,在穆氏衣原体中高达3.61至8.59。我们的结果表明,穆勒氏梭菌作为生物柴油原料的可行性,因为它比魏氏梭菌更合适的脂肪酸组成和更高的脂质生产率。

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