tailieunhanh - Fatty acid profile and nutrition values of the microalga (thalassiosira pseudonana) used in white shrimp culture
This study examined the fatty acid composition and other chemical components of T. pseudonana cultivated as biomass for the production of shrimp seedlings with the aim to evaluate its nutritional values. For the investigation, the microalga was grown under optimal conditions and harvested during log and early stationary phase after 6–8 days of cultivation. | Vietnam Journal of Science and Technology 56 (4A) (2018) 138-145 FATTY ACID PROFILE AND NUTRITION VALUES OF THE MICROALGA (THALASSIOSIRA PSEUDONANA) USED IN WHITE SHRIMP CULTURE Nguyen Van Cong1, *, Do Thi Hoa Vien1, Dang Diem Hong2 1 2 Hanoi University of Science and Technology, No. 1 Dai Co Viet, Ha Noi Institute of Biotechnology, VAST, 18 Hoang Quoc Viet, Cau Giay, Ha Noi * Email: Received: 17 July 2018; Accepted for publication: 8 October 2018 ABSTRACT The microalga Thalassiosira pseudonana is an important feed item in the aquaculture industry, especially for white leg shrimp production. This study examined the fatty acid composition and other chemical components of T. pseudonana cultivated as biomass for the production of shrimp seedlings with the aim to evaluate its nutritional values. For the investigation, the microalga was grown under optimal conditions and harvested during log and early stationary phase after 6–8 days of cultivation. Chemical analysis showed that the main organic components of the biomass were lipid ( % of dry cell weight), protein ( %), and carbohydrate ( %). GC-MS analysis showed that the lipid fraction consisted of % SFAs (hexadecanoic acid % of total fatty acid), % MUFAs, and % PUFAs (EPA % and DHA %). Moreover, the T. pseudonana biomass was found to contain a large variety of minerals and micronutrients (mg/kg), such as I (), Fe (), Cu (), Mn (), Mg (), Ca (), and Co (< ), while boron was undetectable. Importantly, the contents of heavy metals, such as Cd, Pb, As, and Hg were lower than required levels for aquaculture feed by Vietnamese standards. Thus, T. pseudonana is a quality feed with high nutritional values for aquaculture. Keywords: fatty acid profile, lipid, microalga Thalassiosira pseudonana. 1. INTRODUCTION Microalgae are rich in nutrition as protein, lipid, carbohydrate, vitamins, mineral salts, pigments and natural bioactive .
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