揮発性カルボニル化合物のカルボニル価の簡易測定法(第2報)
ベンゼン蒸留法により分離される揮発性カルボニル化合物の同定及び回収率に関する検討
1979 年 28 巻 4 号 p. 263-269
詳細
1979 年 28 巻 4 号 p. 263-269
Several problems about the volatile carbonyl compounds separated with “benzene distillation method” were investigated. Volatile carbonyl compounds separated with “benzene distillation method” from rancid rice crackers fried with soybean oil or lard were converted to their 2, 4-DNPH and identified with mainly TLC. The presence of the C2, C3, and C6 aldehyde was found in the distillates from benzene extract of the rice crackers fried with soybean oil or lard. The presence of C5 and C4 aldehydes was observed in the distillate from lard. The most abundant compound in the two groups was C6 aldehyde. The recoveries of volatile carbonyl compounds with “benzene distillation method” were determined. Head space vapors on rancid oils were gas-chromatographed. The results were compared with that on volatile carbonyl compounds separated with “benzene distillation method”. To improve the recoveries of carbonyl compounds especially C6 aldehyde, the solvents having higher boiling points than benzene were examined. Heptane seemed to be suitable for this purpose.
