. Carotenoids, their comparative biochemistry. Carotenoids. CAROTENOIDS There still remains to be identified the pigment designated " Un- identified II " by Porter and Zscheile^** and which disappeared in advanced generations of the selections containing it; it appears to contain 8 conjugated double bonds ^ * * and its spectrum is recorded in Table 4. 16. 500 Wavelength (mfi) Fig. 9.—^The absorption spectrum In hexane of (o) Prolycopene, (b) Pro-y-carotene, (c) Pro-tetrahydroiycopene and (d) Tetrahydrolycopene (Neurosporene). {From Zechmeister, L (1944) Chem. Rev., 34, 267 (o & b
. Carotenoids, their comparative biochemistry. Carotenoids. CAROTENOIDS There still remains to be identified the pigment designated " Un- identified II " by Porter and Zscheile^** and which disappeared in advanced generations of the selections containing it; it appears to contain 8 conjugated double bonds ^ * * and its spectrum is recorded in Table 4. 16. 500 Wavelength (mfi) Fig. 9.—^The absorption spectrum In hexane of (o) Prolycopene, (b) Pro-y-carotene, (c) Pro-tetrahydroiycopene and (d) Tetrahydrolycopene (Neurosporene). {From Zechmeister, L (1944) Chem. Rev., 34, 267 (o & b), Porter, J. W., and Zscheile, {1946) Arch. Blochem., 10,537. (c), and Haxo, F. {1949) Arch. Blochem., 20, 400. (d).) Note.—^The E values for (c) are only relative. (viii) cis-tsomers of the carotenes have been observed in the fruit of tomatoes, i *». 14 e, 15 2 tj^g palms Butia capitata and B. eriospatha, ^ • * mangoes, 1 •^ ^'^ **' peaches, papayas, guavas, apricots, v^^ater melons, bananas, pineapples, grapes, musk melons, oranges ^ "^ *• ^' * and Pyracantha angustifolia. ^ ^ ^'^ ^ ^ The most important are neo-^-y P-carotenes B and U^*', prolycopene, ^*•»^**• ^• • pro-y-carotene^'' and protetrahydrolycopene. ^ *' The p-carotene isomers have already been discussed (p. 8). Prolycopene and pro-y-carotene are stable pigments which contain, respectively, 5 or 7 and 4 or 5 of their double 30. 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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