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Study on Extraction and Composition of Oil from Jiashi Melon Seed in Xinjiang

Author: BaiXi
Tutor: ZhangZhengFang；WangQiang；TangJun
School: Xinjiang University
Course: Analytical Chemistry
Keywords: The Jiashi seed oil Extract Linoleic acid Physical and Chemical Properties Attenuated total reflectance Fourier transform infrared spectroscopy
CLC: S652
Type: Master's thesis
Year: 2011
Downloads: 60
Quote: 0
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Abstract


This article to Jiashi seeds as main raw material , the use of microwave-assisted extraction method Jiashi pumpkin seed oil by gas chromatography - mass spectrometry ( GC / MS ) analysis of the resulting oil fatty acids and Unsaponifiables determination Jiashi pumpkin seed oil physical and chemical indicators , freezing crystallization urea legitimate combination of enrichment and purification the Jiashi seed oil , linoleic acid , attenuated total reflectance Fourier transform infrared spectroscopy rapid identification of different JIASHI pumpkin seed varieties . The main findings are as follows : on the basis of single factor test in order to get the oil rate of indicators in order to extract time , microwave power , solid-liquid ratio factors , three factors and three levels orthogonal experiment on the Jiashi seed oil microwave-assisted extraction conditions were optimized to obtain optimum extraction conditions : V ( petroleum ether ) : V ( acetone ) = 1:1 as the extraction solvent , microwave power for 480W microwave extraction time for 3 min , the solid-liquid ratio of 1 : 6 ( m / V ) , under this condition , the oil rate was 46.13% . N-hexane as a solvent , using the traditional Soxhlet extraction the JIASHI seeds extract 5h , the oil rate was 47.03% . Microwave assisted extraction of the the Jiashi seed oil and the resultant physical-chemical constants were measured , the results show the The Jiashi seed oil relative density of 0.9058 , a refractive index of 1.4728 and an acid value (KOH) 3.39mg / g , saponification value (KOH ) 169mg / g , iodine number (I) 115.85g/100g, peroxide value 5.4mmol/kg . Analyzed by GC-MS combined with in Jiashi seed oil fatty acids and Unsaponifiables area normalization method for determination of the mass fraction of each component . The results showed that : the Jiashi pumpkin seed oil is rich in unsaturated fatty acids , linoleic acid content of up to 62.56% ; the Jiashi seed oil unsaponifiable matter content of 0.95% , the main component of squalene . Solvent crystallization and Urea valid combination of separation and enrichment in Jiashi seed oil linoleic acid , linoleic acid with a purity of 99.53% , a yield of 50.86% . Finally, attenuated total reflectance Fourier transform infrared spectroscopy ( ATR - FTIR ) method were determined in three different varieties of muskmelon seeds Fourier transform infrared spectroscopy, principal component analysis ( PCA ) to compare the different varieties of Jiashi the melon seed the degree of difference between the chemical composition , the establishment of a rapid identification of the Jiashi seed varieties .

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CLC: > Agricultural Sciences > Gardening > Fruits and horticulture > Melon
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