Na2SiO3-Catalyzed Glycerolysis of Sacha Inchi (Plukenetia volubilis L.) Oil into Di- and Monoacylglycerols |
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Authors: | Jia Luo Zeping Wang Shangzhi Deng Fan Zhang Guirong Bao Junni Mao Wenjing Yang |
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Affiliation: | 1. National Engineering Laboratory of Wheat & Corn Further Processing, Henan University of Technology, Zhengzhou, Henan 450001, China;2. College of Biology and Chemistry, Pu'er University, Pu'er, Yunnan, 665000 China;3. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650093, China;4. Kunming Branch, CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan, 650223 China;5. Kunming Branch, CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan, 650223 China
Center of Economic Botany, Core Botanical Gardens, Chinese Academy of Sciences, Menglun, Mengla, Yunnan, 666303 China |
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Abstract: | Direct glycerolysis of novel edible Sacha Inchi (Plukenetia volubilis L.) seed oil (PvLO) into diacylglycerols (DAG) and monoacylglycerols (MAG) was studied over solid Na2SiO3 with or without microwave assistance. The glycerolysis yield was calculated by qualitative and semiquantitative analyses of 1H NMR, 13C NMR, and FT-IR spectra. The yields of ~33% 1, 3-DAG, ~16% 1, 2-DAG, ~40% 1-MAG, and ~2.3% 2-MAG were achieved after 16 hours at 120 °C in three consecutive cycles using acetone, with an interesterification rate of 92%. The modified oil showed enhanced gelation ability at low temperatures. The yield of 1, 2-DAG can be increased by adding acetone as solvent. The fatty acid compositions and unsaturated structure of lipids were less destroyed after alkaline glycerolysis. However, more α-linolenic and linoleic acids were transferred to the sn-2 position of glyceryl skeleton. The oxidative stability of the modified oil was still controllable. In summary, this work provides a feasible method to convert polyunsaturated plant oils into oils rich in DAG and MAG with less destructive impact on the olefinic structure of oil. Also, it provides a useful example of how to quickly evaluate the influence of chemical modification on the chemical structure of plant oils by using various spectral technologies. |
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Keywords: | Plukenetia volubilis L seed oil Glycerolysis Sodium silicate Microwave Nuclear magnetic resonance |
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