Vitamin A and the provitamin A carotenoids

Ball, G. F. M.

doi:10.1007/978-1-4899-3414-7_3

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Introduction1

Retinyl Palmitate1

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2009

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Cited by 2 publications

(2 citation statements)

References 87 publications

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“…The second mechanism is isomerization of vitamin A from its all-trans form to either 9-cis or 13-cis forms. This is mainly caused by exposure to light or the presence of other light-sensitive substances, such as riboflavin, in a multivitamin mixture [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Antioxidant System for the Preservation of Vitamin A in Ultra Rice

Li¹,

Lam²,

Diósady³

et al. 2009

Food Nutr Bull

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Section: Introductionmentioning

confidence: 99%

Antioxidant System for the Preservation of Vitamin A in Ultra Rice

Li¹,

Lam²,

Diósady³

et al. 2009

Food Nutr Bull

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“…Isomerization from all-trans retinoids to its cis-isomers results in partial loss of vitamin A biological activity (Ball, 1998).…”

Section: Retinyl Palmitatementioning

confidence: 99%

Photostability studies of retinyl palmitate entrapped in policosanol oleogel matrices

Tian¹

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Photostability of all-trans retinyl palmitate (RP) (100% bioactivity) was studied in policosanol oleogels (PCOs) matrices (7%, 10%, and 12%, w/w, policosanol in soybean oil) after UVA irradiation. RP was incorporated into PCOs at levels of 0.04%, 0.1% and 1% (w/w). PCOs efficiently protected RP from UVA-mediated degradation. Over 75% RPactivity remained in PCOs after 4 days of UVA irradiation, while only 12% RP-activity remained in soybean oil. HPLC analysis showed that cis-RP was formed in liquid soybean oil after 2 days of UVA irradiation while it was absent in PCOs matrices. PCOs blocked the energy absorption from UVA and further dampened the UVA-mediated ionic photodissociation and free radical reaction due to matrix immobilization. For all samples, RP photodegradation followed a 2 nd order reaction. From the reaction kinetics, it would be possible to predict the RP photodegradation rate in PCO matrices. PCOs were shown to be a promising matrix to efficiently protect RP from photodegradation.

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Vitamin A and the provitamin A carotenoids

Cited by 2 publications

References 87 publications

Antioxidant System for the Preservation of Vitamin A in Ultra Rice

Antioxidant System for the Preservation of Vitamin A in Ultra Rice

Photostability studies of retinyl palmitate entrapped in policosanol oleogel matrices

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