Studies on the Ferulates Contained in Rice Bran Oil. IV.

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  • ヌカ油中のフェルラ酸エステルの研究 (第4報)
  • ヌカユチュウ ノ フェルラサン エステル ノ ケンキュウ 4 フェルラサン エステル ノ コンユウシケン オヨビ ネツ ニ タイスル キョドウ
  • Isothermals of Artificial Mixtures and Their Chemical Changes During Heating
  • フェルラ酸エステルの混融試験および熱に対する挙動

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Melting points of mixed samples of steryl (campesteryl and β-sitosteryl ferulates, 46 : 54 (wt%)), cycloartenyl, 24-methylene cycloartanyl ferulates were studied. A mixture of cycloartenyl and steryl ferulates, 52 : 48 (wt%) showed a minimum of melting point as the eutective type. Also, a minimum melting point as the eutective type was observed at a mixture of 24-methylene-cycloartanyl and steryl ferulates, 25 : 75 (wt%). The isothermals were made from the melting points of the mixtures of steryl, cycloartenyl and 24-methylene-cycloartanyl ferulates. <BR>The heat stability of the mixture of four kinds of ferulate was investigated. Four samples of the mixture were heated for 8 hours at 120, 195 and 240°C and for five minutes at 350°C, respectively. The heated samples were analysed by thin-layer chromatography and ultraviolet absorption spectra. Unchanged ferulates in heated samples were separated and saponified. The unsaponifiable matters of unchanged ferulates were analysed by gas chromatography to estimate the compositions of the unchanged ferulates. The order of heat stabilities of the ferulates was considered as follows : campesteryl ferulate > β-sitosteryl ferulate > cycloartenyl ferulate > 24-methylene-cycloartenyl f erulate.

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