PROOXIDENT ACTIVITIES OF CHLOROPHYLLS AND THEIR DECOMPOSITION PRODUCTS ON THE PHOTOOXIDATION OF METHYL LINOLEATE
PROOXIDENT ACTIVITIES OF CHLOROPHYLLS AND THEIR DECOMPOSITION PRODUCTS ON THE PHOTOOXIDATION OF METHYL LINOLEATE
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DOI：
10.1007/bf02672135
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发表时间：
1984-01-01
影响因子：
2
通讯作者：
KANEDA, T
中科院分区：
文献类型：
--
作者：
ENDO, Y;USUKI, R;KANEDA, T
虽然叶绿素在油中影响氧化稳定性，很少有人知道有关的叶绿素或其分解产物的促氧化活性。为了评价叶绿素衍生物的促氧化活性，将叶绿素（CHL）A和B、脱镁叶绿素（PHY）A和B以及脱镁叶绿酸（PHO）A和B添加到亚油酸甲酯（ML）中。然后在0 ℃下对样品油进行光氧化，测定过氧化值和234 nm处的吸光度。叶绿素在浓度大于2.2×10− 9 mol/g ML时催化亚油酸甲酯氧化，CHL B表现出较强的促氧化活性，约为2.5 × 10− 9 mol/g ML。在相同光照强度下，其生长量是叶绿素A的2倍。PHY和PHO的促氧化活性强于CHL，其中PHO的促氧化活性最强。此外，光敏活性被发现在PHY以及在CHL。这些结果表明，应特别注意的CHL的分解产物，影响植物油的质量。
Although chlorophylls in oils affect oxidative stabilities, little has been known about the prooxidant activity of the chlorophylls or their decomposition products. To evaluate the prooxidant activities of chlorophyll derivatives, chlorophyll (CHL) A and B, pheophytin (PHY) A and B and pheophorbide (PHO) A and B were added to methyl linoleate (ML). The sample oils were then subjected to photooxidation at O C and the peroxide value and absorbance at 234 nm were measured. Chlorophylls catalyzed oxidation of methyl linoleate at concentrations greater than 2.2×10−9mol/g ML, and CHL B showed a stronger prooxidant activity, ca. twice that of CHL A under the same light intensity. PHY and PHO exhibited stronger prooxidant activities than CHL, the prooxidant activity of PHO being the strongest among them. Moreover, photosensitive activity was found in PHY as well as in CHL. These results suggest that particular attention should be paid to the decomposition products of CHL that affect the quality of vegetable oils.