Document Detail

Variation in ascorbic acid and oxalate levels in the fruit of Actinidia chinensis tissues and genotypes.
MedLine Citation:
PMID:  15769175     Owner:  NLM     Status:  MEDLINE    
Ascorbic acid and total oxalate were measured in fruit from six genotypes of Actinidia chinensis. Ascorbic acid was separated from oxalate in fruit extracts by HPLC and quantified from absorbance at 245 nm, whereas oxalate was measured enzymatically in the HPLC eluate. Levels of whole fruit mean ascorbic acid in the different genotypes ranged from 98 to 163 mg/100 g of fresh weight (FW), whereas mean oxalate varied between 18 and 45 mg/100 g of FW. Ascorbic acid was highest in the inner and outer pericarp, whereas oxalate was concentrated in the skin, inner pericarp, and seed. Essentially no ascorbic acid was found in the seed. Each tissue clustered separately when the tissue ascorbic acid and oxalate data were normalized to the whole fruit level of ascorbic acid and oxalate in that genotype and plotted against each other, suggesting that oxalate is not a sink for excess ascorbic acid but that oxalate formation is regulated.
Maysoon Rassam; William Laing
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  53     ISSN:  0021-8561     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2005 Mar 
Date Detail:
Created Date:  2005-03-16     Completed Date:  2005-04-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2322-6     Citation Subset:  IM    
GeneTech, The Horticulture and Food Research Institute of New Zealand, P.B. 92169, Auckland, New Zealand.
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MeSH Terms
Actinidia / chemistry*,  genetics*
Ascorbic Acid / analysis*
Chromatography, High Pressure Liquid
Fruit / chemistry*
Oxalates / analysis*
Reg. No./Substance:
0/Oxalates; 50-81-7/Ascorbic Acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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