+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Isomerization of retinyl palmitate in fortified skim milk under retail fluorescent lighting



Isomerization of retinyl palmitate in fortified skim milk under retail fluorescent lighting



Journal of Agricultural & Food Chemistry 36(3): 592-595



The rate of loss of all-trans-retinyl palmitate (RP) and 13-cis-RP was monitored under fluorescent lighting (1076 lx) in fortified skim milk in paperboard, polyethylene, and glass milk containers to simulate commercial display cases. Commercially fortified milk contained 5-10% 13-cis-RP, initially. The rate of all-trans-RP loss was apparent first order, with rate constants of 0.01690 .+-. 0.001 22 and 0.011 43 .+-. 0.0017/h for glass and plastic containers, respectively. 13-cis-RP was lost at 0.0116 .+-. 0.003 51 and 0.007 84 .+-. 0.002 65/h in glass and plastic containers, respectively. No significant loss of either isomer occurred in paperboard containers. 9-cis-RP was observed only in glass and plastic containers after 3 days of illumination. The mechanism to explain the loss of RP is more complex than first order and probably includes isomerization and oxidation.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 001625111

Download citation: RISBibTeXText

DOI: 10.1021/jf00081a046


Related references

Isomerization of retinyl palmitate in milk under retail lighting. Abstracts of Papers American Chemical Society 193, 1987

Effect of fluorescent light on the isomerization of retinyl palmitate in skim milk. Journal of Food Science 51(6): 1456-1458, 1986

Liquid chromatographic analysis of all-trans-retinyl palmitate, b-carotene, and vitamin E in fortified foods and the extraction of encapsulated and nonencapsulated retinyl palmitate. Journal of Agricultural and Food Chemistry 48(9): 03-8, 2000

Liquid chromatographic analysis of all-trans-retinyl palmitate, beta-carotene, and vitamin E in fortified foods and the extraction of encapsulated and nonencapsulated retinyl palmitate. Journal of Agricultural and Food Chemistry 48(9): 4003-4008, 2000

Retinyl palmitate isomers in skim milk during light storage as affected by ascorbic acid. Journal of Food Science 63(4): 597-600, 1998

Determination of retinyl palmitate (vitamin A) in fortified fluid milk by liquid chromatography: collaborative study. Journal of Aoac International 86(2): 375-385, 2003

Antioxidant effects on retinyl palmitate stability and isomerization in nonfat dry milk during thermally accelerated storage. International Dairy Journal 35(2): 111-115, 2014

Use of water-miscible retinyl palmitate as markers of chylomicrons gives earlier peak response of plasma retinyl esters compared with oil-soluble retinyl palmitate. British Journal of Nutrition 86(4): 427-432, 2001

Cis trans isomerization of retinyl palmitate in foods. Journal of Agricultural & Food Chemistry 35(5): 748-751, 1987

Isomerization of retinyl palmitate using conventional lipid extraction solvents. Journal - Association of Official Analytical Chemists 66(3): 746-750, 1983

Postprandial concentrations of retinyl palmitate following ingestion of oil-soluble and water-miscible preparations of retinyl palmitate in healthy adults. Proceedings of the Nutrition Society 60(OCB): 172A, Autumn, 2001

Levels of retinyl palmitate and retinol in the stratum corneum, epidermis, and dermis of female SKH-1 mice topically treated with retinyl palmitate. Toxicology and Industrial Health 22(4): 181-191, 2006

Vitamin A is rapidly degraded in retinyl palmitate-fortified soybean oil stored under household conditions. Journal of Agricultural and Food Chemistry 62(30): 7559-7566, 2014

Levels of retinyl palmitate and retinol in the skin of SKH-1 mice topically treated with retinyl palmitate and concomitant exposure to simulated solar light for thirteen weeks. Toxicology and Industrial Health 23(10): 581-589, 2007

Binding of retinyl and palmitate moieties of retinyl palmitate at separate sites on beta-lactoglobulin. Journal of Dairy Science 81(Suppl. 1): 19, 1998