Document Detail

Loss of L-ascorbic acid in commercial drinking milk caused by milk processing and storage times.
MedLine Citation:
PMID:  19842423     Owner:  NLM     Status:  MEDLINE    
The goals of this study were to determine L-ascorbic acid concentrations in various milk products, and to evaluate the effect of storage time on L-ascorbic acid in milk. Commercial plain milk samples were obtained from either a raw-food market or a supermarket, in Mae Hia, Mueang District, Chiang Mai Province, Thailand, during July, 2008. The types of milk were separated based on fat percentages (non fat-0%, low fat-1.5%, full fat-3%), and their method of processing (pasteurization, UHT). All samples were collected, transported, and measured for their L-ascorbic acid concentrations on the same day. The expiration date, type of milk, and source of milk were recorded. Pasteurized milk had higher L-ascorbic acid levels than UHT milk (p < 0.05), but no differences of L-ascorbic acid levels were seen among the milk fat percentage groups. The L-ascorbic acid level was significantly positively related to time before the expiration date of the milk, indicating that increased storage time of milk is related to decreased L-ascorbic acid concentration in the milk. Longer milk storage times resulted in lower- L-ascorbic acid levels and pasteurized milk has higher L-ascorbic acid levels than UHT milk.
Nannapat Nalame; Wasana Chaisri; Witaya Suriyasathaporn
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Southeast Asian journal of tropical medicine and public health     Volume:  40     ISSN:  0125-1562     ISO Abbreviation:  Southeast Asian J. Trop. Med. Public Health     Publication Date:  2009 Jul 
Date Detail:
Created Date:  2009-10-21     Completed Date:  2009-11-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0266303     Medline TA:  Southeast Asian J Trop Med Public Health     Country:  Thailand    
Other Details:
Languages:  eng     Pagination:  848-51     Citation Subset:  IM    
Ruminant Clinic, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai, Thailand.
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MeSH Terms
Ascorbic Acid / analysis*
Food Handling*
Food Preservation*
Milk / chemistry*
Time Factors
Reg. No./Substance:
50-81-7/Ascorbic Acid

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