Optimization of fatty acid profile and synthesis of biodiesel from mixing Salvodara persica and Leucas aspera seed oils: Critical analysis of fuel properties

As a unique woody oil tree, Camellia oleifera Abel originates from southern China and is now being cultivated in central China, such as the southern Henan province. The aim of this work is to determine some physiochemical parameters, fatty acid profile and tocopherol composition of the Camellia oleifera seed oils harvested in southern Henan in the 2016 season. The lipid contents of the kernel are in the range of 28.39- 56.94% on dry matter. The acid value (AV), saponification value (SV), iodine value (IV), and refractive index of the oils are in the ranges: 0.22-5.17 mg KOH/g, 178.90-196.91 mg KOH/g, 82.0-87.1 g I2/100g, and 1.4667-1.4720 (nD25) , respectively. The main fatty acids are: palmitic 7.07-9.52%, palmitoleic 0.09-0.22%, stearic 1.45-2.94%, oleic 77.02-84.33%, linoleic 5.19-11.23%, linolenic 0.53-0.70% and arachidic 0.22-0.70%. The sn-2 fatty acid composition is: 84.36-91.33% oleic, 7.14-14.22% linoleic, and 0.89-1.96% others. The tocopherol content is in the range of 39.55-75.94 mg/100g oil, including mainly α-tocopherol (33.98-67.82 mg/100g) and γ-tocopherol (5.57- 8.27 mg/100g) when the oils are extracted with hexane; and 14.91-44.36 mg/100g, including mainly α-tocopherol (9.42-37.08 mg/100g) and γ-tocopherol (5.50-7.33 mg/100g) when the oils are extracted by ethyl ether. The physiochemical properties C. oleifera seed oils from southern Henan are similar to those from other districts of China.

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Fatty Acid Profile of New Varieties of Grape Seed Oils Based on NMR Data and Their Authentication

Revista de Chimie ◽

10.37358/rc.18.1.6058 ◽

2018 ◽

Vol 69 (1) ◽

pp. 130-135

Author(s):

Mihaela Tociu ◽

Maria Cristina Todasca ◽

Mihaela Mihalache ◽

Victoria Artem ◽

Anamaria Hanganu

Keyword(s):

Fatty Acid ◽

Fatty Acid Profile ◽

1H Nmr ◽

Acid Content ◽

Fatty Acid Content ◽

Spectroscopic Method ◽

Principal Component ◽

Grape Seed ◽

Seed Oils ◽

Grape Seeds

Grape seeds from five known red grape sorts and two new local sorts, obtained by hybridization of red and white varieties, have been valorized as vegetal oils, through good yield extraction. The fatty acid content the of obtained oils was determined by GC-FID, as methyl esters, and directly by 1H-NMR spectroscopy. The obtained grape seed oils have a high content in linoleic acid (over 70%) and a relatively low quantity of saturated fatty acid (stearic and palmitic). Both measurement methods gave similar results confirming the accuracy of the spectroscopic method, which is less time and reagent consuming. Based on the fatty acid profile (FAP) of the oils, determined by either FT-IR or 1H-NMR and using the Principal Component Analysis (PCA) and Hierarchical Clustering Analysis (HCA) statistical methods, the discrimination between the classical known grape sorts and the new local varieties could be achieved. The results show that such method is appropriate for discovering possible adulteration of the grape oils, valuable products due to the essential unsaturated acid content.

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