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Effect of different postharvest temperatures on the accumulation of sugars, organic acids, and amino acids in the juice sacs of Satsuma mandarin (Citrus unshiu Marc.) fruit.
MedLine Citation:
PMID:  22950419     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
To elucidate the effect of different postharvest temperatures on the accumulation of sugars, organic acids, and amino acids and to determine the best temperature to minimize their postharvest change, their content after harvest was investigated at 5, 10, 20, and 30 °C for 14 days in the juice sacs of Satsuma mandarin (Citrus unshiu Marc. cv. Aoshima-unshiu) fruit. In all sugars, the changes were negligible at all temperatures. Organic acids decreased slightly at all temperatures, with the exception of malic acid at 30 °C, which increased slightly. Two amino acids, ornithine and glutamine, increased at 5°C, but they did not increase at other temperatures. In 11 amino acids (phenylalanine, tryptophan, tyrosine, isoleucine, leucine, valine, threonine, lysine, methionine, histidine, and γ-amino butyric acid), the content was higher at 20 and 30 °C than at other temperatures. Thus, the content of amino acids was more variable than that of sugars and organic acids in response to temperatures. Moreover, amino acids responded to temperature differently: 2 amino acids were cold responsive and 11 were heat-responsive. The best temperature to minimize the postharvest changes in amino acid profiles in the juice sacs of Aoshima-unshiu was 10 °C. The responsiveness to temperatures in 2 cold-responsive (ornithine and glutamine) and 5 heat-responsive (phenylalanine, tryptophan, valine, lysine, and histidine) amino acids was conserved among 3 different Satsuma mandarin cultivars, Aoshima-unshiu (late-maturing cultivar), Silverhill (mid-maturing cultivar), and Miyagawa-wase (early-maturing cultivar). Metabolic responsiveness to temperature stress was discussed on the basis of the changes in the amino acid profile.
Authors:
Hikaru Matsumoto; Yoshinori Ikoma
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-9-5
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  -     ISSN:  1520-5118     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-9-6     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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