パーム油の粗大結晶について : 対称型モノオレオイルジ飽和トリグリセリドと粗大結晶

概要

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The granular crystals growing in palm oil were examined by means of GLC, DSC, and X-ray diffractometer. The polymorphic behaviors of palm oil mixed with 2-oleodipalmitin fraction (POP fraction) from palm oil or 2-oleopalmitostearin fraction (POS fraction) from cocoa butter were determined with X-ray diffractometer. (1) The granular crystals in palm oil consisted of symmetric monooleoyl disaturated triglycerides, mainly of 2-oleodipalmitin. (2) X-ray diffraction patterns of the granular crystals showed, in all cases, β form. (3) POP fraction and POS fraction transformed from unstable α form to stable β form at 30°C or higher temperature than 25°C, and grew into the granular crystals. (4) The transformation of symmetric monooleoyl disaturated triglycerides was promoted by liquid solid ratio, temperature, and tempered time. (5) In palm oil : POP fraction mixtures, a) all of the samples which were tempered at 10 and 15°C exhibited β form. b) the granular crystals grew in the samples containing 80% or more of palm oil at 20°C. c) the granular crystals grew in the samples containing 40% or more of POP fraction at higher temperature than 25°C.
社団法人日本油化学会の論文