Guangdong Engineering Technology Research Center for Oils and Fats Biorefinery

Guangzhou, China

Guangdong Engineering Technology Research Center for Oils and Fats Biorefinery

Guangzhou, China
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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


Zhang Z.,South China University of Technology | Zhang Z.,Jinan University | Ma X.,Australian National University | Huang H.,South China University of Technology | And 4 more authors.
JAOCS, Journal of the American Oil Chemists' Society | Year: 2017

MDs [monoacylglycerols (MAGs) and diacylglycerols (DAGs) mixture] are widely-used emulsifiers in specialty fats industrial production. An enzymatic production of highly unsaturated MDs (HUSMDs) and its effects on the storage stability of a palm oil-based shortening system are reported. Oleic acid and corn oil were used to produce HUSMDs in a bubble column reactor (BCR) system in the presence of Novozyme 435. Under the optimized reaction conditions, the content of HUSMDs in the products was above 82 wt% with 46.67 wt% of MAGs and 35.56 wt% DAGs, respectively. Moreover, in the subsequent evaluation of MDs’ effects on the storage stabilities of a palm oil-based shortening system (IEPO), HUSMDs proved to be a potent emulsifier with decent aeration properties and a possible alternative to saturated MAGs and DAGs (SMDs) made from fully hydrogenated high erucic acid colza oil. Compared with SMDs, HUSMDs decreased the crystallization rate significantly. The microstructure of them shows improved stability of β′ crystals, and no obvious aggregation of crystals was recorded in IEPO with HUSMDs, which also demonstrated the most stable hardness. © 2017 AOCS


Cui C.,Jinan University | Cui C.,Guangdong Engineering Technology Research Center for Oils and Fats Biorefinery | Teng Y.,Jinan University | Teng Y.,Guangdong Engineering Technology Research Center for Oils and Fats Biorefinery | And 8 more authors.
Journal of the Chinese Cereals and Oils Association | Year: 2016

Nuclear magnetic resonance (NMR) analysis of phosphatidylcholine (PC) was conducted by the internal standard method. 31P-NMR spectra were obtained with a BRUKER AV500 spectrometer at 25℃ in methanol-d4 using triphenyl phosphate as the internal standard. For each measurement, the following parameters were applied: the detection frequency 202.446 MHz, spectra width 81 521.742 Hz, pulses width 11.9 μs, acquisition time 0.4 s, delay time 2 s, and the number of scan 160. The integration of signals at δ=-0.57×10-6 (PC) and -17.45×10-6(triphenyl phosphate) were used for the quantification. By linear regression of these signals, a regression equation of the signal area of PC and concentration was obtained as y=2.672x-0.037, with a correlation coefficient of 0.998. The precision of the instrument (RSD) was 0.68% (n=6). The average recovery for PC was 102.50%, with an RSD of 4.26%. © 2016, Dept. of JCCOA. All right reserved.


Zhang Z.,South China University of Technology | Zhang Z.,Jinan University | Ma X.,Australian National University | Huang H.,South China University of Technology | And 2 more authors.
LWT - Food Science and Technology | Year: 2017

To expand low melting point “liquid” base oil categories of plastic fats, the soft fat named SheaOL25 as a byproduct of shea butter with a melting point of 25.5 °C was achieved via solvent fractionating of shea butter, and abounded in oleic acid and stearic acid/oleic acid/oleic acid (SOO) type triacylglycerols. The compatibility test with palm-based oil and coconut oil showed the desirable linear relationship of isothermal curve. At temperatures above 25 °C, SheaOL25 exhibits good compatibility and could serve as a blending base oil for preparing specialty fats. Compared with palm olein, blending SheaOL25 and palm stearin can significantly expedite crystallization rate and retard crystallization rate after interesterification, thereby stabilizing the β′ crystal form in the system. Further exploration of SheaOL25 as “liquid” oil in oil-in-water emulsion system revealed that SheaOL25 as the oil phase can significantly improve the system's stability compared with the control groups of soybean oil and palm olein towards maintaining the particle size and emulsion stability under high temperatures. © 2017 Elsevier Ltd


Chen Q.,Jinan University | Chen Q.,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 8 more authors.
European Journal of Lipid Science and Technology | Year: 2017

The blend of refined soybean oil and distilled saturated monoacylglycerol in a mass ratio of 70: 30 w/w were enzymatically interesterified under the optimized enzyme dosage (5% w/w) and time (5 h) at 60°C, followed by further purification through molecular distillation (MD). All samples were evaluated and compared in terms of their iodine value (IV), acylglycerols, fatty acid composition, solid fat content (SFC), crystallization, and melting properties. The diacylglycerol content in the MD residual was found increased from 16.2% in interesterified oils to 22.6%. As the temperature increased, the SFC in the MD residual declined to the similar level of that in RSO. However, the crystallization onset temperature and melting point measured by differential scanning calorimetry were much higher than those of RSO. Moreover, the presence of β′ crystal was found in the MD residual by X-ray diffraction and polarized light microscopy. In addition, the MD distillate had 27.4% of unsaturated fatty acids and the lowest IV amongst samples. Considering the properties above, the MD residual (diacylglycerol-enriched oil) could be considered as plastic fats for fluid margarine and the MD distillate (by-product) with 36.8 g/100 g of IV could be a potential emulsifier for oil and fat products. Practical applications: An innovative design for the production of diacylglycerol-enriched oils was developed through optimized enzymatic interesterification and MD afterwards using oversupplied DSM and inexpensive RSO in China. On one hand, the resulting MD residual showed its promising application for fluid margarine because of its relatively high value in DAG, unsaturated fatty acid content, crystallization onset temperature, and melting point, as well as the existence of β′ crystal form found inside. On the other hand, the MD distillate as the MD by-product may become a novel food emulsifier preferred by general consumers due to its lowest IV and enhanced unsaturated fatty acid content. The production of DAG-enriched oils was developed using refined soybean oil (RSO) and distilled saturated monoacylglycerol (DSM) via coupling of optimized enzymatic interesterification and molecular distillation. The resulting MD residual and distillate were characterized by several physical and chemical analyses (e.g., GC-FID, DSC, p-NMR, XRD, and PLM) in order to prove their applicability for oil and fat products, especially in fluid margarine and food emulsification. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim


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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