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KMID : 0903520040470040403
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
2004 Volume.47 No. 4 p.403 ~ p.408
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Content Analyses of Fiber, Protein and Amino Acids of Fully Ripe Fruits of Korea Native Squash, Cucurbita moschata Poir
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Youn Sun-Joo
Jun Ha-Joon
Kang Sun-Chul
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Abstract
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We studied active substances like crude cell wall components, crude protein, composing amino acids and free amino acids including orinithine cycle-related amino acids such as asparagine, ornithine and citrullin in fully ripe fruits of Korean native squash, Cucurbita moschata Poir. Crude protein content of ‘Jeju 2’ was the highest with 2,830 μg/g, while ‘Sangju’ was the lowest with 1,319 μg/g. Regarding the contents of crude cell wall components, fruit ‘Kanghaw’ was the highest with 2,961 mg% while ‘Namhea’ was the lowest with 1,582 mg%. Pectin contents of crude cell wall components were the highest in ‘Kanghaw’ (2,198 mg%) followed by ‘Jeju 2’ (2,178 mg%) and ‘Jeju 1’ (1,461 mg%). The main contents of amino acids in squash were glutamic acid, aspartic acid, lysine, leucine and valine, which comprised to be more than 50% of total amino acid contents. Especially, in ‘Jeju 2’ aspartic acid and threonine were not detected. In fully ripe fruits, a total of 34 kinds of free amino acids were detected including 8 kinds of essential amino acids (histidine, isoleucine, leucine, lysine, phenylalanine, methionine, threonine and valine). More than 50% of the total free amino acids were aspartic acid and asparagine, and also all varieties were detected in ornithine, citrullin, and arginine, which are related to Ornithine cycle. There was a big difference in the contents of arginine in all varieties whereas the contents of ornithine and citrullin were very similar. ‘Teaan’ 29.34% was 7 times higher than ‘Namhea’ 4.30% in regards to arginine contents.
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KEYWORD
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Cucurbita moschata Poir, active substances, pectine, free amino acids, Ornithine cycle
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