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

抄録

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.