Studies on the Constituents of Rice-Bran Oil. III. Structure of Oryzanol-C.
25 Jan 1960-Chemical & Pharmaceutical Bulletin (The Pharmaceutical Society of Japan)-Vol. 8, Iss: 1, pp 5-9
About: This article is published in Chemical & Pharmaceutical Bulletin.The article was published on 1960-01-25 and is currently open access. It has received 21 citations till now. The article focuses on the topics: Rice bran oil.
Citations
More filters
TL;DR: Triterpene alcohols and sterols were separated by thin-layer chromatography and gas-liquid chromatography from the unsaponifiable fractions of the following 18 vegetable oils: linseed, peanut, olive, rice bran, palm kernel, corn, sesame, oiticica, palm, coconut, rapeseed, grape seed, sunflower, poppy seed, castor, tea seed, cocoa butter and soybean as discussed by the authors.
Abstract: Triterpene alcohols and sterols were separated by thin-layer chromatography and gas-liquid chromatography from the unsaponifiable fractions of the following 18 vegetable oils: linseed, peanut, olive, rice bran, palm kernel, corn, sesame, oiticica, palm, coconut, rapeseed, grape seed, sunflower, poppy seed, castor, tea seed, cocoa butter and soybean. Two triterpene alcohols, cycloartenol and 24-methylene cycloartanol, were found in all of the oils except soybean oil, which contained only cycloartenol. Triterpene alcohols such as α- and β-amyrin, euphorbol, butyrospermol and cyclolaudenol also were encountered occasionally. Three sterols, β-sitosterol, stigmasterol and campesterol were present in all of the oils. In addition a fourth sterol, not yet idenfified, was found in oils of palm, palm kernel and sunflower in varying amounts. This unknown sterol and brassicasterol were found in rapeseed oil in addition to the three sterols that were common to all of the oils studied.
89 citations
TL;DR: The distribution of triterpenes was studied in 56 species of the Gramineae and their wide occurrence confirmed and triterpene methyl ethers, especially those of fernane and arborane groups, were found to be characteristic constituents of this family.
86 citations
TL;DR: The feasibility of the above approach was established using the well characterised steryl ferulate mixture γ-oryzanol obtained from rice bran oil, and the methods were subsequently applied to the analysis of theSteryl ferulates present in seeds of maize.
55 citations
TL;DR: A comparison of the results obtained by applying three spectrophotometric methods to the determination of γ-oryzanol in rice bran oil is reported and some aspects of the chemical, spectroscopic (UV, IR, IR) and thermoanalytical (TG, DSC) behaviour of λmax=327 nm and values of the parameters which enable "computation" of its UV spectra are reported.
Abstract: A comparison of the results obtained by applying three spectrophotometric methods (at fixed wavelength, second-derivative and multicomponent analysis) to the determination of gamma-oryzanol in rice bran oil is reported. At fixed wavelength the results are more accurate when using isopropyl alcohol, rather than n-heptane, to dilute the oil samples, because the absorption bands of gamma-oryzanol are red-shifted and the absorbance, measured at lambda(max)=327 nm, is less affected by the interference of the oil "matrix" (lambda(max)=314 nm in n-heptane).However, to obtain accurate results also in oils with a low content of gamma-oryzanol, it is necessary to perform the analysis using second-derivative ((2)D330.365) or multicomponent (lambda=310-360 nm) methods. The first one fully removes the interference of oil matrix whilst the second, which needs a specific computational program to process the spectrophotometric data, furnishes evidence the presence of some unexpected interference in the analysis and/or standards which are not representative of the analysed samples, from the square root of the sum of the squared differences at each point between the linear combination of the standards and the unknown spectra (RMS error).Finally, some aspects of the chemical, spectroscopic (UV, IR) and thermoanalytical (TG, DSC) behaviour of gamma-oryzanol and the values of the parameters which enable "computation" of its UV spectra are reported.
53 citations
TL;DR: The following sterols have been identified in grapefruit peel: β-sitosterol, stigmasterol, campesterol, cycloeucalenol, 24-methylene lopenol and 24-ethylidene lophenol as discussed by the authors.
47 citations