Title

Hydroxylation of β-Carotene on Micro-Cel C

Document Type

Article

Date of Original Version

7-1-1976

Abstract

β-Carotene underwent substantial hydroxylation to isocryptoxanthin (4-hydroxy-β-carotene) when brought in contact with Micro-Cel C, an adsorbent long presuined to be inert. The reaction was rapid, the maximum accumulation rate of isocryptoxanthin occurring within the first 15 min. The extent of hydroxylation depended directly on the amount of Micro-Cel C; the percent yield of 1 mg of β-carotene ranged from 23% with 10 g of Micro-Cel C to 65% with 30 g of Micro-Cel C. Isozeaxanthin (4,4′-dihydroxy-β-carotene) was also formed but at markedly lower amounts. Very small quantities of mutatochrome, echinenone, 4-hydroxy-5′,8′-epoxy-β-carotene, and dehydro-β-carotene were also detected. The hydroxylating property of Micro-Cel C was not observed in other adsorbents such as silica gel, kieselguhr, Celite, alumina, HyfloSupercel, and MgO. © 1976, American Chemical Society. All rights reserved.

Publication Title

Journal of Agricultural and Food Chemistry

Volume

24

Issue

4

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