• Title/Summary/Keyword: alga

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Chromatographic Determination of Amino Acids in Nonprotein and Protein Fraction Of Undaria Pinnatifida

  • Kwon, Tai-Wan;Lee, Tae-Young
    • Applied Biological Chemistry
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    • v.1
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    • pp.55-61
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    • 1960

  • The amino acid compositions of the protein and the nonprotein fractions obtained from a marine brown alga, 'Undaria pinnatifida' were determined by use of Ion Exchange Column Chromatography. The protein nitrogen in the alga was about ten times of the nonprotein nitrogen. Nonprotein fraction obtained from the extraction with 80 percent ethanol contains considerable amount of tree citrulline. Alanine content in the alga was the highest (about 1 per cent in dry weight) and one third of which was found in free state. The amino acid composition of the alga was well balanced and the content of the essential amino acids were relatively higher, than soybean protein. In addition, several peptide like substances were fractionated from nonprotein fraction, in which one way identified as a naturally occurring new tripeptide composed of alanine, glutamic acid and aspartic acid, and the remaining unknown substances are under investigation for the further information.

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Application of reproductive allocation index to the analysis of growth and maturation patterns of Sargassum macrocarpum C. Agardh in Jeju Island, Korea (제주연안 큰열매모자반의 생장과 성숙패턴 분석을 위한 생식배분 지수의 적용)

  • Ko, Shin Ja;Kim, Yoo Kyung;Hong, Seong Wan;Kang, Min Su;Hwang, Eun Kyoung;Lee, Young Don
    • Korean Journal of Environmental Biology
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    • v.37 no.4
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    • pp.672-681
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    • 2019

  • The ecological characteristics of Sargassum macrocarpum, an ecologically and commercially valuable brown alga, were investigated from May 2018 to June 2019 in Jeju Island, Korea. The S. macrocarpum population formed patches at depths of 3-5 m. Growth in the length of the alga reached a maximum of 135.3±20.0 cm in June. The weight of the alga reached a maximum of 3.6±2.1 kg·wet-wt in May. The mean density and biomass of S. macrocarpum was 4.5 individuals·m-2 and 4.6 kg·wet-wt.·m-2 in their habitat. Receptacles were observed from April to August and egg release was detected from June to July when the seawater temperatures were 19.3-22.9℃. The developmental initiation of thalli occurred at temperatures above 14.1℃ and maturation required approximately 726.3 degree-days. The reproductive allocation of this alga, calculated from the reproductive frond length(RFL) and reproductive frond weight(RFW) indices to the whole length and weight, reached a maximum of 69.3% in June. The growth and maturation patterns of S. macrocarpum could be divided into vegetative growth (October-January), maturity preparation (February-April), maturation (May-June), egg release (June-July), and resting period (August-September). This was the first study to examine an S. macrocarpum population throughout the entire year in a natural habitat in Jeju Island, Korea.

  • https://doi.org/10.11626/KJEB.2019.37.4.672 인용 PDF KSCI