Characterization of Wei Safflower Seed Oil Using Cold-Pressing and Solvent Extraction.

Wei safflower seed oil (WSO) prepared by the cold pressing method and organic solvent extraction method was characterized in this study. The yield of cold-pressed WSO (CP-WSO) was inferior to that of n-hexane-extracted WSO (HE-WSO). The physicochemical properties (refractive index, density, iodine value, insoluble impurities) and fatty acid compositions were similar, and both were rich in linoleic acid. However, CP-WSO had better color and less solvent residue. The type and content of vitamin E in CP-WSO was also superior to that in HE-WSO, which explained the high oxidative stability of CP-WSO in the Rancimat test. Our results provide a reference for the development of Wei safflower seed oil.

The effects of extracting procedures on occurrence of polycyclic aromatic hydrocarbons in edible oils.

Polycyclic aromatic hydrocarbons (PAHs) are one of the most hazardous naturally occurring chemical contaminants of food. Edible oils are easily contaminated by PAHs generated during high-temperature processing steps such as oil extraction and refining. In this study, the effects of different extraction methods on the levels of PAHs in sesame oils and red pepper seed oils were assessed. GC-MS was used to determine the levels of PAHs in edible oils. Sesame oils extracted from seeds by plate-pressing extraction method had lower levels of PAHs than those extracted by screw-expeller extraction method from sesame flour. Furthermore, the levels of PAHs increased by 62.2% when the extraction time was longer. Notably, the PAHs already present in oils could be effectively reduced by refining procedures such as sinking, centrifugation, filtration, and neutralization with alkali.

Identification of terpenes and phytosterols in Dipteryx alata (baru) oil seeds obtained through pressing

ABSTRACTThe oil from seeds of Dipteryx alata Vogel, Fabaceae, popularly known as baru, was extracted by hydraulic and continuous screw pressing. A total of eleven chemical constituents obtained by hydraulic pressing, including steroids, mono and sesquiterpenes and tocopherol derivatives were identified by gas chromatography–tandem mass spectrometry (GC–MS). Compounds limonene, β-elemene, γ-elemene, α-caryophyllene, β-caryophyllene, campesterol, stigmasterol, β-sitosterol and cycloartenol are being described for the first time in the baru oil.