. Carotenoids, their comparative biochemistry. Carotenoids. CAROTENOIDS cryptoxanthin palmitate. There is more cryptoxanthin than [3-carotene in the rind of Seville oranges^'^'^'^ and it constitutes about 30 per cent, of the total carotenoid of the pulp of Indian oranges, but is slightly less abundant (25 per cent.) in the rind. ^ *' Physalien, ^' * the pigment responsible for the deep red colour of mature berries of P. alkekengi is zeaxanthin dipalmitate^®; there is no zeaxanthin in the unripe sepals. ^' * Zeaxanthin is apparently the principal carotenoid in fruit of the palm Cycas revoluta ^
. Carotenoids, their comparative biochemistry. Carotenoids. CAROTENOIDS cryptoxanthin palmitate. There is more cryptoxanthin than [3-carotene in the rind of Seville oranges^'^'^'^ and it constitutes about 30 per cent, of the total carotenoid of the pulp of Indian oranges, but is slightly less abundant (25 per cent.) in the rind. ^ *' Physalien, ^' * the pigment responsible for the deep red colour of mature berries of P. alkekengi is zeaxanthin dipalmitate^®; there is no zeaxanthin in the unripe sepals. ^' * Zeaxanthin is apparently the principal carotenoid in fruit of the palm Cycas revoluta ^' ^ and it also occurs in kaki fruit (Diospyros kaki). ^' ^ Violaxanthin and flavoxanthin have been reported in Cotoneaster occidentalis and Pryacantha coccinea" * berries, respectively. Xanthophylls having considerable species specificity have been isolated from fruits of yt\v (Taxus baccata), rhodoxanthin, ^'' rose hips, (Rosa rubiginosa) rubixanthin, ^''^ v^oody nightshade (Solanum dulca- mara) lycoxanthin and lycophyll ;^''^ red peppers (Capsicum annuum)^ capsorubin and capsanthin ; ^ ® ° false bittersw^eet (Celastrus scandens), celaxanthin, ^ * ^ oranges citroxanthin ; ^ ^ ^ and from spindle tree berries (Euonymus europaeus) antheraxanthin ^ ^ ^ {see p. 50). Citroxanthin has recently been identified as mutatochrome ^ ^ * {see p. 15). Me. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Goodwin, T. W. (Trevor Walworth). New York, Chemical Pub. Co.
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