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1. Optimization of Supercritical extraction process for Perilla essential Oil | |||
Zhang Meiping,Shan Yongjie,Shen Zhenguo,Li Jiancheng,Zhang Zetao | |||
Food Science and Technology 28 June 2019 | |||
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Abstract:The essential oil of perilla was extracted by supercritical carbon dioxide extraction with perilla as raw material. On the basis of single factor experiment, the optimum conditions for extracting perilla essential oil were obtained.The optimum process parameters are as follows:The perilla seeds were crushed to 50m 100 mesh; supercritical extraction temperature: 45~55℃;extraction pressure: 305Mpa.Extractive time: 4h;refined separation pressureI: 89Mpa.separation pressureII: 5~6.5Mpa. First-order molecular distillation dehydration,deodorization: distilled I temperature: 60~90C, distillation I vacuum: 500~5000Pa, Flow rate: 200~400g/h,scraper speed: 250~350r/min;second order molecular distillation deacidification: distillation II temperature: 150~170℃, distillation II vacuum degree: 5~20 Pa, built-in condensation temperature: 30~60℃, flow rate: 200~400 g/h, scraper speed: 250~350 r/min; freezing dewaxing: freezing temperature: -5~0℃, freezing time: 16~12h. Extraction rate > 39%. | |||
TO cite this article:Zhang Meiping,Shan Yongjie,Shen Zhenguo, et al. Optimization of Supercritical extraction process for Perilla essential Oil[OL].[28 June 2019] http://en.paper.edu.cn/en_releasepaper/content/4749295 |
2. Identification and characterization of diacylglycerol acyltransferase in oleaginous yeast Rhodosporidium toruloides | |||
Zhen Wang,Huaiyuan Zhang,Yuanda Song | |||
Food Science and Technology 18 March 2016 | |||
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Abstract:Diacylglycerol acyltransferase (DGAT), which catalyzes TAG formation from DAG and acyl-CoA, has been considered to play a vital role in TAG accumulation in oleaginous microorganisms. The genome of oleaginous yeast Rhodosporidium toruloides contains two putative DGAT genes, RtDGATa and RtDGATb, which shared little conserved amino acid coding sequence with each other. Phylogeny tree analysis showed that RtDGATa belonged to DGAT1 family and RtDGATb belonged to DGAT2 family. For functional identification of the DGATs, RtDGATa and RtDGATb were individually expressed in Saccharomyces cerevisiae TAG-deficient quadruple mutant (H1246). RtDGATa had obvious preference for monounsaturated fatty acids, however the expression of RtDGATa did not alter the TAG content in S. cerevisiae H1246, and it had non-involvement in TAG accumulation according to its mRNA expression level in R. toruloides. The expression of RtDGATb could completely resume TAG biosynthesis in S. cerevisiae H1246. Substrate preference experiments revealed that RtDGATb preferred unsaturated fatty acids over saturated fatty acids, but not C18:3. Only the expression pattern of RtDGATb was related to the process of fatty acid biosynthesis, suggesting that RtDGATb plays an important role in lipid accumulation in R. toruloides. | |||
TO cite this article:Zhen Wang,Huaiyuan Zhang,Yuanda Song. Identification and characterization of diacylglycerol acyltransferase in oleaginous yeast Rhodosporidium toruloides[OL].[18 March 2016] http://en.paper.edu.cn/en_releasepaper/content/4681339 |
3. Lipase-catalyzed synthesis and the lipid metabolic effect of phytosterol esters | |||
Pang Min,Zheng Haijie,Jiang Shaotong | |||
Food Science and Technology 17 November 2015 | |||
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Abstract:In this paper, the esterifications of phytosterol with oleic acid catalyzed by Candida rugosa lipase in organic solvent were studied. The esterification conditions (temperature, substrate molar ratio, reaction time and catalyst amount) were optimized by response surface methodology (RSM). The phytoserol linoleic acid ester was also prepared via lipase-catalyzed. The lipid metabolic effect of equivalent intakes of phytoserol oleic/linoleic acid esters and that of different intakes of the same ester were compared. The results demonstrated that the highest phytoserol oleic acid ester esterification degree of 77.43% was obtained under the optimized conditions: temperature of 41℃, reaction time of 19h, substrate molar ratio (oleic acid: phytosterol) of 2.4:1 and catalyst amount of 7%. The chemical structure of phytoserol oleic acid ester was confirmed by FT-IR and GC-MS. The prepared phytosterol esters decreased significantly TC, LDL-C, LDL-C/HDL-C, ApoAⅠ, ApoAⅠ/ApoB in serum and liver weight, HI, hepatic TC, hepatic TG, while they also increased significantly HDL-C and ApoB in serum. No significant changes were found in the concentrations of TG. In contrast, linoleic acid ester could have a advantage effect on cholesterol-lowering and antioxidant capacity over oleic acid ester. | |||
TO cite this article:Pang Min,Zheng Haijie,Jiang Shaotong. Lipase-catalyzed synthesis and the lipid metabolic effect of phytosterol esters[OL].[17 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4662571 |
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