Enhancing starch production of a marine green microalga Tetraselmis subcordiformis through nutrient limitation

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• 作者：Changhong Yao ; Jiangning Ai ; Xupeng Cao ; Song Xue ; Wei Zhang
• 关键词：DW ; dry weight ; ASW ; artificial seawater ; ASW-N-S ; nitrogen- and sulfur-deprived artificial seawater ; +N+S ; nitrogen- and sulfur-sufficient conditions ; &minus ; N ; nitrogen-deprived conditions ; &minus ; S ; sulfur-deprived conditions ; HI ; high irradiance ; LI
• 刊名：Bioresource Technology
• 出版年：2012
• 出版时间：August, 2012
• 年：2012
• 卷：118
• 期：Complete
• 页码：438-444
• 全文大小：757 K

文摘

Microalgal starch is a potential feedstock for biofuel production. The effects of KNO₃ and MgSO₄ concentrations and light intensity on biomass and starch production by the marine microalga, Tetraselmis subcordiformis, were investigated. Under 200 ¦Ìmol m^?2 s^?1 irradiance and sulfur-deprived conditions, a starch productivity of 0.62 g L^?1 d^?1 and a starch content of 62.1 % based on dry weight (DW) was achieved. A starch content of 54.3 % was achieved under low irradiance and nitrogen starvation, which was 6.5 % higher than that under nutrient- and light-sufficient conditions. Photosynthetic activity was indispensable for starch accumulation. It is difficult to reach high starch productivity and starch concentration simultaneously. Proper nutrient concentrations are necessary to achieve high starch productivity or starch concentration based on the target. The high starch productivity and starch content suggest that T. subcordiformis is a promising microalgal starch producer.