1923-89-3Relevant articles and documents
Influence of oxygen-containing sulfur flavor molecules on the stability of β-carotene under UVA irradiation
Zhang, Gong-Liang,Wu, Hong-Yan,Liang, Ying,Song, Jie,Gan, Wei-Qi,Hou, Hong-Man
, (2019)
The influence of 11 kinds of oxygen-containing sulfur flavor molecules was examined on β-carotene stability under UVA irradiation in ethanol system. Both the effects of sulfides on dynamic degradation of β-carotene and the relation between structure and effect were investigated. The oxidation products of β-carotene accelerated by sulfides under UVA irradiation were also identified. The results indicated that the disulfides had more obvious accelerative effects on the photodegradation of β-carotene than mono sulfides. The degradation of β-carotene after methyl (2-methyl-3-furyl) disulfide (MMFDS), methyl furfuryl disulfide (MFDS) and bis(2-methyl-3-furyl) disulfide (BMFDS) exposure followed first-order kinetics. Furan-containing sulfides such as MMFDS and BMFDS showed more pronounced accelerative effects than their corresponding isomers. The oxidation products were identified as 13-cis-β-carotene, 9,13-di-cis-β-carotene and all-trans-5,6-epoxy-β-carotene. These results suggest that both the sulfur atom numbers and the furan group in oxygen-containing sulfides play a critical role in the photooxidation of β-carotene.
Oxidation Products of β-Carotene during the Peroxidation of Methyl Linoleate in the Bulk Phase
Yamauchi, Ryo,Tsuchihashi, Kakue,Kato, Koji
, p. 1301 - 1306 (1998)
Methyl linoleate containing β-carotene was autoxidized or photooxidized at 37°C in the bulk phase, and the oxidation products of β-carotene were analyzed by high-performance liquid chromatography. Formyl β-carotenes, β-carotene 5,6-epoxide, and cyclic ethers of β-carotene were detected as the oxidation products during the peroxidation of methyl linoleate initiated by a free radical initiator. These products, which were also detected in the methyl linoleate autoxidized without an initiator, were detectable only in much smaller amounts than the consumed β-carotene. In the chlorophyll-sensitized photooxidation process, the products were β-carotene 5,8-endoperoxide and β-carotene 5,6-epoxide. α-Tocopherol partially inhibited the formation of the 5,6-epoxide, but had no effect on the main product, the 5,8-endoperoxide. These results indicate that β-carotene reacted with singlet oxygen to form the 5,8-endoperoxide as the primary product during the photooxidation of methyl linoleate, and that β-carotene trapped lipid-peroxyl radicals to form oxygenated products which decomposed immediately during the autoxidation process.
Carotenoids and carotenoid esters in potatoes (Solanum tuberosum L.): New insights into an ancient vegetable
Breitbaupt, Dietmar E.,Bamedi, Ameneh
, p. 7175 - 7181 (2007/10/03)
The carotenoid pattern of four yellow- and four white-fleshed potato cultivars (Solanum tuberosum L.), common on the German market, was investigated using HPLC and LC(APCI)-MS for identification and quantification of carotenoids. In each case, the carotenoid pattern was dominated by violaxanthin, antheraxanthin, lutein, and zeaxanthin, which were present in different ratios, whereas neoxanthin, β-cryptoxanthin, and β,β-carotene generally are only minor constituents. In contrast to literature data, antheraxanthin was found to be the only carotenoid epoxide present in native extracts. The total concentration of the four main carotenoids reached 175,ug/100 g, whereas the sum of carotenoid esters accounted for 41-131 μg/100 g. Therefore, carotenoid esters are regarded as quantitatively significant compounds in potatoes. For LC(APCI)-MS analyses of carotenoid esters, a two-stage cleanup procedure was developed, involving column chromatography on silica gel and enzymatic cleavage of residual triacylglycerides by lipases. This facilitated the direct identification of several potato carotenoid esters without previous isolation of the compounds. Although the unequivocal identification of all parent carotenoids was not possible, the cleanup procedure proved to be highly efficient for LC(APCI)-MS analyses of very low amounts of carotenoid esters.
