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Sun G.,Jinan University | Sun G.,Guangdong Engineering Technology Research Center for Oils and Fats Biorefinery | Li Y.,Jinan University | Li Y.,Guangdong Engineering Technology Research Center for Oils and Fats Biorefinery | And 6 more authors.
Applied Catalysis B: Environmental | Year: 2017

Hydrotalcite (HT) loaded with potassium carbonate (K2CO3) was originally applied as a promising heterogeneous solid base catalyst for the production of trimethylolpropane fatty acid triester (TFATE) as the biolubricant base oil through transesterification of fatty acid methyl esters (FAME) from waste cooking oils and trimethylolpropane (TMP), in which FAME to TMP ratio (3:1), catalyst dosage (2% w/w), pressure (300 Pa), temperature (160 °C) and time (2 h) were optimized in order to obtain the best TFATE yield (80.6%). Based on the above, K2CO3 dosage (30% w/w) and calcination temperature (500 °C) in the preparation of HT/K2CO3 catalyst were optimized to improve the TFATE yield to 93.9% along with 97.7% of conversion rate of FAME (CRF). The catalyst recycling was also investigated to determine the suitable reactivated method. Besides, HT/K2CO3 catalysts in various states were characterized for better comprehension of their functional mechanisms and appropriate potential applications. © 2017 Elsevier B.V.


Liang S.,Jinan University | Liang S.,Guangdong Engineering Technology Research Center for Oils and Fats Biorefinery | Liao W.,Jinan University | Liao W.,Guangdong Engineering Technology Research Center for Oils and Fats Biorefinery | And 5 more authors.
Food Chemistry | Year: 2017

In this present study, a novel flaxseed gum oligosaccharide (FGOS) was prepared by H2O2 oxidative degradation method followed by physicochemical properties characterization and antiradical activity evaluation. Results indicated that the degradation rate of flaxseed gum is 37.81% under the optimum conditions (i.e., reaction temperature of 120 °C, H2O2 concentration of 0.2 M and reaction time of 2.0 h) and FGOS as a reddish brown semisolid was obtained. Physicochemical properties identification showed that FGOS has a molecular weight of 1047 Da and is a typical oligosaccharide which contains uronic acid. Characterizations showed FGOS is acid glycopyranose that consists of rhamnose, fucose, xylose, mannose, arabinose, glucose and galactose with mole percentages of 8.26%, 7.54%, 12.85%, 7.93%, 29.31%, 14.28% and 19.82% respectively. FGOS exhibited good free radical scavenging ability (OH[rad] 82.58%, DPPH[rad] 52.74% and ABTS[rad] 91.29% at most, respectively), suggesting its potent antiradical activity. © 2017 Elsevier Ltd


Liu M.,Jinan University | Liu M.,Guangdong Engineering Technology Research Center for Oils and Fats Biorefinery | Fu J.,Jinan University | Fu J.,Guangdong Engineering Technology Research Center for Oils and Fats Biorefinery | And 8 more authors.
JAOCS, Journal of the American Oil Chemists' Society | Year: 2016

In this study, diacylglycerols (DAG) were synthesized rapidly (~30 min) in a solvent-free system via esterification of glycerol with fatty acids (FA, the mixture of 60 wt% palm oil deodorizer distillate and 40 wt% oleic acid) catalyzed by Lipozyme 435 (Novozymes A/S, Copenhagen, Denmark) using a bubble column reactor. The content of DAG, monoacylglycerols (MAG), triacylglycerols (TAG) and free fatty acids (FFA) in the crude product were 57.94 ± 1.60 wt%, 24.68 ± 2.08 wt%, 2.67 ± 1.72 wt% and 14.69 ± 1.22 wt%, respectively under the selected conditions, which were enzyme load of 5.0 wt%, glycerol/FA mole ratio of 7.5, initial water content of 2.5 wt%, reaction temperature of 60 °C, reaction time of 30 min and N2 gas flow of 10.6 cm min−1. The final product containing 91.30 ± 1.10 wt% of DAG was obtained by one-step molecular distillation at 200 °C. The reusability of Lipozyme 435 was investigated by evaluating the esterification degree (ED) and the DAG content in the crude products in 30 successive runs. The enzyme retained 95.10 % of its original activity during 30 successive runs according to comparison of the ED. The new process showed a very high efficiency in production of DAG with a high purity. The ratio of positional isomers 1,3-DAG to 1,2 -DAG was 2:1 in the final product. The certain plasticity (melting point of 44 °C) and content of unsaturated fatty acids made the product a valuable food ingredient. © 2016 AOCS


Zhang N.,Jinan University | Zhang N.,Guangdong Engineering Technology Research Center for Oils and Fats Biorefinery | Yang X.,Jinan University | Yang X.,Guangdong Engineering Technology Research Center for Oils and Fats Biorefinery | And 7 more authors.
Journal of Oleo Science | Year: 2016

In this study, diacylglycerol-enriched soybean oil (DESO) was synthesized through Lipozyme 435-catalyzed glycerolysis of soybean oil (SO) in a solvent-free system using a modified bubble column reactor. The effects of enzyme load, mole ratio of glycerol to soybean oil, reaction temperature, gas flow and reaction time on DAG production were investigated. The selected conditions were established as being enzyme load of 4 wt% (mass of substrates), glycerol/soybean oil mole ratio of 20:1, reaction temperature of 80℃, gas flow of 10.6 cm/min, and a reaction time of 2.5 h, obtaining the DAG content of 49.4±0.5 wt%. The reusability of Lipozyme 435 was evaluated by monitoring the contents of DAG, monoacylglycerol (MAG) and triacylglycerol (TAG) in 10 consecutive runs. After purified by one-step molecular distillation, the DAG content of 63.5±0.3 wt% was achieved in DESO. The mole ratio of 1, 3-DAG to 1, 2-DAG was 2:1 and the fatty acid composition had no significant difference from that of soybean oil. However, the thermal properties of DESO and SO had considerable differences. Polymorphic form of DESO were mainly the β form and minor amounts of the β ′ form. Granular aggregation and round-shaped crystals were detected in DESO. © 2016 by Japan Oil Chemists’ Society.

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