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http://dx.doi.org/10.5657/KFAS.2022.0091

Compositional Characteristics of the Microalga Melosira nummuloides Mass-cultured Using Jeju Lava Seawater  

Kim, Yunyoung (Natural F&P Corp.)
Shin, Hyun-A (Natural F&P Corp.)
Choi, Jeong-Woo (Natural F&P Corp.)
Kim, Mi-Yeon (Natural F&P Corp.)
Go, Gyung-Min (JDK Bio)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.55, no.2, 2022 , pp. 91-101 More about this Journal
Abstract
In this study, we analyzed the compositional characteristics of Melosira nummuloides mass-cultured using Jeju lava seawater. M. nummuloides showed the highest growth rate when cultured for 14 days at 17-20℃ and 15,000 lx. Proximate composition of raw-material (RM) and freeze-dried M. nummuloides (FM) showed high ash content (65-72%), while ethanol-extracted M. nummuloides (EM) had low ash and high lipid contents. The predominantly occurring mineral, Si, was 334 g/kg in RM and 269 g/kg in FM, but EM contained only 1.97 g/kg. The ratio of essential amino acids was similar in RM (38.93%) and FM (36.89%) lower in EM (17.83%), but branched chain amino acids required for muscle metabolism was high (63.40%). The polyunsaturated fatty acids of EM (34.74%) was 11% more than that in RM (23.81%), and the ratio of omega-6 to omega-3 fatty acids was 1:3.6. Furthermore, the concentration of total chlorophyll was higher by 5.15 times (62.32 mg/g) and that of fucoxanthin by 7.06 times (11.02 mg/g) in EM than in RM (12.11, 1.56 mg/g, respectively). The mass cultivation and filtration of M. nummuloides using lava seawater has high prospects of commercialization as a competitive bio silica, cosmetic and healthy functional food material.
Keywords
Melosira nummuloides; Diatom; Si; Omega-3 fatty acid; Fucoxanthin;
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