Use of Radioactive Cartene to Compare Absorption Coefficients of cis and trans .BETA.-Carotene.

The Longest Polyene

“…Although the short wavelength part of the vis-spectrum of C80Zea:27 deviates from the habitual C40Zea:11 shape (Figure ) it conforms to the fine structure seen with C60:19-carotene. , Nevertheless, since the polyene chain may be sensitive to spatial variations the occurrence of cis -( Z )-isomers cannot be excluded; after all, more than one million isomers are theoretically expected . On the other hand, the short high-temperature microwave reaction favors the formation of the all trans- ( E ) - isomer; the longer the polyene, the more the trans -isomer is stabilized. , The absence of spectral changes after the classical cis → trans isomerization experiment with light and I 2 supports the predominance of the all- trans -isomer (Figure 1S, Supporting Information).…”

Lower Photostability of Capsanthin Dispersed in an Aqueous Solution

“…The purity of the carotenoids, determined by a combination of the HPLC method and the absorbance method, [7][8][9][10] was as follows: 95% for tomato lycopene, 98% for -carotene, 68% for lutein, and 70% for capsanthin. Carotenoid dispersions were prepared of the following composition: 1% carotenoid, 10% gum arabic as emulsifier (Gum Arabic Powder NO.…”