A kind of novel shape-stabilized phase change material （SSPCM） was prepared by using a melting intercalation technique. This kind of SSPCM was made of lauric acid （LA） as a phase change material and organophilic m...A kind of novel shape-stabilized phase change material （SSPCM） was prepared by using a melting intercalation technique. This kind of SSPCM was made of lauric acid （LA） as a phase change material and organophilic montmorillonite （OMMT） as a support material. And the thermal properties and morphology of the SSPCM were characterized by X-ray diffraction （XRD）, transmission electron microscope （TEM）, scanning electronic microscope （SEM）, scanning calorimeter （DSC）, and differential thermal cravimetry （TG）. The DSC result shows that the phase change temperature of the SSPCM is close to that of LA, and its latent heat is equivalent to that of the calculated value based on the mass ratio of LA measured by TG. The XRD, SEM and TEM results demonstrate that the LA intercalates into the silicate layers of the OMMT, thus forming a typically intercalted hybrid, which can restrict the molecular chain of the LA within the structure of OMMT at high temperature. And consequently SSPCM can keep its solid state during its solid-liquid phase change processing.展开更多
This paper reported that a way of preparing superoxide dismutase (SOD) modified by lauric acid (LA-SOD) and study on stability of LA-SOD. The results showed that LA-SOD had high specific activity, high stability and h...This paper reported that a way of preparing superoxide dismutase (SOD) modified by lauric acid (LA-SOD) and study on stability of LA-SOD. The results showed that LA-SOD had high specific activity, high stability and high rate of recovery. The stability of LA-SOD in temperature, pH and human gastric juice was much higher than that of natural SOD. Because LA-SOD is kept for a long time at room temperature, it can widen the applied range of SOD and bring out considerable benificial results both in society and economy.展开更多
Corn cob is a naturally renewable material with developed micropore and hydrophobic characteristics, which enables it to show good oil adsorption capacity. In order to improve oil adsorption capacity, corn cob was mod...Corn cob is a naturally renewable material with developed micropore and hydrophobic characteristics, which enables it to show good oil adsorption capacity. In order to improve oil adsorption capacity, corn cob was modified with lauric acid and ethanediol. The structure of raw and modified corn cob was investigated using Fourier transform infrared(FTIR) spectroscopy, scanning electron microscopy(SEM), Brunauer-Emmett-Teller(BET) method, thermogravimetric analysis(TGA) and Ze Ta potential analyzer. The effects of p H level, adsorption time, adsorbent dosage, and initial oil concentration on oil absorbency of corn cob were studied. The results indicate that the modification significantly improved the lipophilicity of corn cob, making the modified corn cob with much better adsorption capacity on oil absorbency. Compared with raw corn cob, the maximum saturated adsorption capacity of modified corn cob is 16.52 mg/g at p H 5, and the increasing percentage is found to be 141%, which indicates that the modification causes a better adsorption capacity for oil removal. In addition, due to high oil adsorption capacity, affordable price and low secondary pollution, the modified corn cob could be considered promising alternative for the traditional oil adsorbent to clean up the emulsified oily water.展开更多
A novel route for the synthesis of alumina nanospheres was reported by a surfactant-governed approach in the presence of lauric acid.The products were characterized using X-ray diffraction （XRD）,scanning electron mi...A novel route for the synthesis of alumina nanospheres was reported by a surfactant-governed approach in the presence of lauric acid.The products were characterized using X-ray diffraction （XRD）,scanning electron microscope （SEM） and N2 adsorption-desorption techniques.The results show that the produced alumina nanospheres possess uniform nanosphere sizes ranging from 80 120 nm,and high surface area of 550 m2/g.It suggests that the synthesized alumina nanospheres are formed through self-assembly of surfactant/alumina species complex in 1-propanol system.展开更多
In this study,medium-and long-chain triacylglycerol(MLCT)structured lipids were synthesized by lipase catalyzed acidolysis of lauric acid(La)with four kinds of common edible oils of different fatty acid compositions,i...In this study,medium-and long-chain triacylglycerol(MLCT)structured lipids were synthesized by lipase catalyzed acidolysis of lauric acid(La)with four kinds of common edible oils of different fatty acid compositions,including palm oil(PO),camellia oleifera seed oil(CSO),soybean oil(SO)and flaxseed oil(FO).The lipases and reaction conditions including substrate molar ratio,reaction temperature,(time and enzyme loading)were optimized.The physicochemical properties of their MLCT products were determined.Moreover,the interaction mechanism between lipase and different MLCT molecules was revealed.The obtained optimum conditions were as follows:substrate molar ratios of 3:1(La/oil)for FO,SO,and CSO,7:1 for PO;enzyme loading of 8%,reaction temperature of 50℃,and reaction time of 6 h for PO,4 h for SO and 3 h for CSO and FO.Under the conditions,the product based on PO had the highest La content(40.37%)and MLCT yield(94.85%),followed by FO and SO,(29.86%,29.71%and 88.41%,87.55%,respectively),least on CSO(25.40%and 81.79%).The lipase established hydrogen bonds and hydrophobic interactions with triacylglycerol ligands.Triacylglycerol 1(3),2-Linolenin-3(1)-Laurin(LnLnLa,specific in FO-MLCT)exhibited strongest binding activity with Lipozyme RM.Compared with substrate oils,the corresponding MLCT structured lipids showed improved thermal behavior and significant differences in the crystallization temperature as a result of acidolysis esterification.This study developed diverse MLCTs with La,and provided an in-depth understanding of the relationships between substrate composition,interaction,and MLCT structured lipids.展开更多
This work presents the results of tribological investigations of lubricating substances composed of water and a nonionic surfactant:lauric acid random copolyether(LPE),as additive.At the current stage of investigation...This work presents the results of tribological investigations of lubricating substances composed of water and a nonionic surfactant:lauric acid random copolyether(LPE),as additive.At the current stage of investigation,aqueous solutions with LPE additives are prepared and subsequently the lowering friction and reducing wear behaviors are tested by means of friction/wear tester,in conjunction with that the film forming properties experiments are carried out with a nanoscale film thickness measure apparatus.The contact is under condition of steel-steel tribo-pair.The results show that the coefficient of friction measured decreases considerably to about over 60%relative to water.The film thickness data of friction process lubricated by aqueous solutions with LPE added show that the lubrication is in boundary lubrication regime.The results indicate that aqueous solutions with LPE added can be used to improve the lubricity and they may be applied to real tribological systems.展开更多
Medium-and long-chain triglycerides(MLCT)have been widely concerned.In this study,lauric acid(La)was incorporated into flaxseed(Linum usitatissimum L.)oil(FO,aLna-riched)by lipase-catalyzed acidolysis.The synthesis ef...Medium-and long-chain triglycerides(MLCT)have been widely concerned.In this study,lauric acid(La)was incorporated into flaxseed(Linum usitatissimum L.)oil(FO,aLna-riched)by lipase-catalyzed acidolysis.The synthesis efficiency of four immobilized lipases(Lipozyme RM IM,TL IM,AOAB8 and Novozym 435)was compared,while Lipozyme AOAB8 reaction for 2 h was the best scheme.Further,the optimal conditions for synthesizing structural lipids(aLSLs,rich in aLna and La)were obtained by response surface methodology:the reaction temperature was 44.6℃,substrate molar ratio was 12(La/FO),and enzyme loading was 9.11%.After purification by molecular distillation,the triglycerides(TAGs)of aLSLs contained 75.35% of TAGs withα-linolenic acid(aLna),40.82%of MLCTs with La,and 26.75%(65.53% of the total MLCTs)of TAGs with both aLna and La(ɑ-MLCT).Meanwhile,the content of La and aLna in aLSLs were 22.38%and 39.78%,respectively.The chemical structure and microstructure of aLSLs were similar to FO.In addition,the thermo-oxidative decomposition behavior of aLSLs was significantly improved compared with physical mixture oil.This improvement might be related to the insertion of La and the structure of TAG.In all,this study firstly developed a novel thermo-oxidatively stable MLCT with high levels of aLna and La.展开更多
Lauric acid(LA)has the possibility to improve milk production in dairy cows by improving mammary gland development,however,the mechanism by which it might regulate mammary gland development is unclear.The influence of...Lauric acid(LA)has the possibility to improve milk production in dairy cows by improving mammary gland development,however,the mechanism by which it might regulate mammary gland development is unclear.The influence of LA on milk production,nutrient digestibility and the expression of proteins related to mammary gland development in dairy cows were evaluated.Forty primiparous Holstein dairy cows were divided into 4 groups in a randomized block design.Four treatments included the control(0 g/d LA per cow),low-LA(100 g/d LA per cow),medium-LA(200 g/d LA per cow),and high-LA(300 g/d LA per cow).Yields of milk,fat-corrected milk,and energy-corrected milk quadratically increased(P<0.05),and yield and content of milk fat linearly increased(P<0.05)with LA supplementation.Percentages of C12:0,C18:1 and C20:1 fatty acids in milk fat linearly increased(P<0.05),but that of C16:0 fatty acid linearly decreased(P=0.046).Supplementation of LA led to a linear and quadratical increase(P<0.05)in digestibility of dry matter,organic matter,neutral detergent fibre and acid detergent fibre,and ruminal total volatile fatty acid concentration but a linear reduction(P=0.018)in the ratio of acetate to propionate.The enzymatic activities of ruminal pectinase,xylanase,andα-amylase,and populations of total bacteria and anaerobic fungi increased linearly(P<0.05),while populations of total protozoa and methanogens decreased linearly(P<0.05)with increased LA addition.Following LA addition,blood glucose,triglyceride,estradiol,prolactin,and insulin-like growth factor 1 concentrations increased linearly(P<0.05)and albumin and total protein concentrations increased quadratically(P<0.05).Moreover,addition of 200 g/d LA promoted(P<0.05)the expression of protein involved in mammary gland development and fatty acids synthesis.These results suggested that LA addition enhanced milk production and fatty acids synthesis by stimulating nutrient digestion,the expression of proteins associated with milk fat synthesis and mammary gland development.展开更多
The esterification of lauric acid with methanol could be efficiently catalyzed by ZrOCl2·8H2O, and this reaction was studied to develop a green method for biodiesel production. The influencing factors, such as am...The esterification of lauric acid with methanol could be efficiently catalyzed by ZrOCl2·8H2O, and this reaction was studied to develop a green method for biodiesel production. The influencing factors, such as amount of catalyst, reaction time and molar ratio of acid to methanol, were investigated. The results indicated that the ZrOCl2·8H2O catalyst showed high catalytic activity, and gave a 97.0% methyl laurate conversion rate under the following optimized conditions, viz.: a lauric acid/methanol molar ratio of 1:10, a catalyst dosage of 4%, and a reaction duration of 2 h at methanol refluxing temperature. The catalyst could be easily recovered while its activity could be well retained after three cycles. The ZrOCl2·8H2O catalyst also exhibited excellent catalytic activity for the esterification of different free long-chain fatty acids(including nonedible oils with high acid value) with different short carbon chain alcohols. Therefore, the ZrOCl2·8H2O catalyst has good potential for the synthesis of biodiesel from low-cost feedstocks such as waste vegetable oils and non-edible oils.展开更多
The objective of this study was to establish the thermal characteristics of the lauric acid (95% purity) as a latent heat storage material filled in the annulus of vertical concentric double pipe during its melting pr...The objective of this study was to establish the thermal characteristics of the lauric acid (95% purity) as a latent heat storage material filled in the annulus of vertical concentric double pipe during its melting process,The temperature data were used to determine the thermal characteristics,including the temporal temperature variations and the effects of the mass flow rate and the inlet temperature of the heat transfer fluid on the heat transfer coefficient and the heat charging fraction during the melting process,The results indicated that the time to reach to heat charging fraction of 1.0 could be altered by changing the mass flow rate and the inlet temperature of the heat transfer fluid.展开更多
文摘A kind of novel shape-stabilized phase change material （SSPCM） was prepared by using a melting intercalation technique. This kind of SSPCM was made of lauric acid （LA） as a phase change material and organophilic montmorillonite （OMMT） as a support material. And the thermal properties and morphology of the SSPCM were characterized by X-ray diffraction （XRD）, transmission electron microscope （TEM）, scanning electronic microscope （SEM）, scanning calorimeter （DSC）, and differential thermal cravimetry （TG）. The DSC result shows that the phase change temperature of the SSPCM is close to that of LA, and its latent heat is equivalent to that of the calculated value based on the mass ratio of LA measured by TG. The XRD, SEM and TEM results demonstrate that the LA intercalates into the silicate layers of the OMMT, thus forming a typically intercalted hybrid, which can restrict the molecular chain of the LA within the structure of OMMT at high temperature. And consequently SSPCM can keep its solid state during its solid-liquid phase change processing.
文摘This paper reported that a way of preparing superoxide dismutase (SOD) modified by lauric acid (LA-SOD) and study on stability of LA-SOD. The results showed that LA-SOD had high specific activity, high stability and high rate of recovery. The stability of LA-SOD in temperature, pH and human gastric juice was much higher than that of natural SOD. Because LA-SOD is kept for a long time at room temperature, it can widen the applied range of SOD and bring out considerable benificial results both in society and economy.
基金Project(51174017)supported by the National Natural Science Foundation of China
文摘Corn cob is a naturally renewable material with developed micropore and hydrophobic characteristics, which enables it to show good oil adsorption capacity. In order to improve oil adsorption capacity, corn cob was modified with lauric acid and ethanediol. The structure of raw and modified corn cob was investigated using Fourier transform infrared(FTIR) spectroscopy, scanning electron microscopy(SEM), Brunauer-Emmett-Teller(BET) method, thermogravimetric analysis(TGA) and Ze Ta potential analyzer. The effects of p H level, adsorption time, adsorbent dosage, and initial oil concentration on oil absorbency of corn cob were studied. The results indicate that the modification significantly improved the lipophilicity of corn cob, making the modified corn cob with much better adsorption capacity on oil absorbency. Compared with raw corn cob, the maximum saturated adsorption capacity of modified corn cob is 16.52 mg/g at p H 5, and the increasing percentage is found to be 141%, which indicates that the modification causes a better adsorption capacity for oil removal. In addition, due to high oil adsorption capacity, affordable price and low secondary pollution, the modified corn cob could be considered promising alternative for the traditional oil adsorbent to clean up the emulsified oily water.
基金supported by the State Key Basic Research Program of China(2006CB202505)the National Natural Science Foundation of China(20806093)
文摘A novel route for the synthesis of alumina nanospheres was reported by a surfactant-governed approach in the presence of lauric acid.The products were characterized using X-ray diffraction （XRD）,scanning electron microscope （SEM） and N2 adsorption-desorption techniques.The results show that the produced alumina nanospheres possess uniform nanosphere sizes ranging from 80 120 nm,and high surface area of 550 m2/g.It suggests that the synthesized alumina nanospheres are formed through self-assembly of surfactant/alumina species complex in 1-propanol system.
基金supported by the National Natural Science Foundation of China(32372469,32302223 and 31871763)Basic Scientific Research Project of Zhejiang University of Science and Technology(2023QN032)+1 种基金Zhejiang Province Key Science and Technology Projects(2023C02042,2023C02045)Agriculture and Social Development Projects of Hangzhou(202203A11).
文摘In this study,medium-and long-chain triacylglycerol(MLCT)structured lipids were synthesized by lipase catalyzed acidolysis of lauric acid(La)with four kinds of common edible oils of different fatty acid compositions,including palm oil(PO),camellia oleifera seed oil(CSO),soybean oil(SO)and flaxseed oil(FO).The lipases and reaction conditions including substrate molar ratio,reaction temperature,(time and enzyme loading)were optimized.The physicochemical properties of their MLCT products were determined.Moreover,the interaction mechanism between lipase and different MLCT molecules was revealed.The obtained optimum conditions were as follows:substrate molar ratios of 3:1(La/oil)for FO,SO,and CSO,7:1 for PO;enzyme loading of 8%,reaction temperature of 50℃,and reaction time of 6 h for PO,4 h for SO and 3 h for CSO and FO.Under the conditions,the product based on PO had the highest La content(40.37%)and MLCT yield(94.85%),followed by FO and SO,(29.86%,29.71%and 88.41%,87.55%,respectively),least on CSO(25.40%and 81.79%).The lipase established hydrogen bonds and hydrophobic interactions with triacylglycerol ligands.Triacylglycerol 1(3),2-Linolenin-3(1)-Laurin(LnLnLa,specific in FO-MLCT)exhibited strongest binding activity with Lipozyme RM.Compared with substrate oils,the corresponding MLCT structured lipids showed improved thermal behavior and significant differences in the crystallization temperature as a result of acidolysis esterification.This study developed diverse MLCTs with La,and provided an in-depth understanding of the relationships between substrate composition,interaction,and MLCT structured lipids.
基金supported by the Fundamental Research Funds for the Central Universities(Grant No.2013JBZ015)
文摘This work presents the results of tribological investigations of lubricating substances composed of water and a nonionic surfactant:lauric acid random copolyether(LPE),as additive.At the current stage of investigation,aqueous solutions with LPE additives are prepared and subsequently the lowering friction and reducing wear behaviors are tested by means of friction/wear tester,in conjunction with that the film forming properties experiments are carried out with a nanoscale film thickness measure apparatus.The contact is under condition of steel-steel tribo-pair.The results show that the coefficient of friction measured decreases considerably to about over 60%relative to water.The film thickness data of friction process lubricated by aqueous solutions with LPE added show that the lubrication is in boundary lubrication regime.The results indicate that aqueous solutions with LPE added can be used to improve the lubricity and they may be applied to real tribological systems.
基金The authors gratefully acknowledge the funding support of Key Project of Science and Technology Innovation 2025 program(2019B10060)the National Natural Science Foundation of China(32072224).
文摘Medium-and long-chain triglycerides(MLCT)have been widely concerned.In this study,lauric acid(La)was incorporated into flaxseed(Linum usitatissimum L.)oil(FO,aLna-riched)by lipase-catalyzed acidolysis.The synthesis efficiency of four immobilized lipases(Lipozyme RM IM,TL IM,AOAB8 and Novozym 435)was compared,while Lipozyme AOAB8 reaction for 2 h was the best scheme.Further,the optimal conditions for synthesizing structural lipids(aLSLs,rich in aLna and La)were obtained by response surface methodology:the reaction temperature was 44.6℃,substrate molar ratio was 12(La/FO),and enzyme loading was 9.11%.After purification by molecular distillation,the triglycerides(TAGs)of aLSLs contained 75.35% of TAGs withα-linolenic acid(aLna),40.82%of MLCTs with La,and 26.75%(65.53% of the total MLCTs)of TAGs with both aLna and La(ɑ-MLCT).Meanwhile,the content of La and aLna in aLSLs were 22.38%and 39.78%,respectively.The chemical structure and microstructure of aLSLs were similar to FO.In addition,the thermo-oxidative decomposition behavior of aLSLs was significantly improved compared with physical mixture oil.This improvement might be related to the insertion of La and the structure of TAG.In all,this study firstly developed a novel thermo-oxidatively stable MLCT with high levels of aLna and La.
基金funded by the Education Department of Shanxi Province,Excellent Doctor Work Award Fund Research Project[SXYBKY2018036]Modern Agro industry Technology Research System of Shanxi Province (2023CYJSTX13).
文摘Lauric acid(LA)has the possibility to improve milk production in dairy cows by improving mammary gland development,however,the mechanism by which it might regulate mammary gland development is unclear.The influence of LA on milk production,nutrient digestibility and the expression of proteins related to mammary gland development in dairy cows were evaluated.Forty primiparous Holstein dairy cows were divided into 4 groups in a randomized block design.Four treatments included the control(0 g/d LA per cow),low-LA(100 g/d LA per cow),medium-LA(200 g/d LA per cow),and high-LA(300 g/d LA per cow).Yields of milk,fat-corrected milk,and energy-corrected milk quadratically increased(P<0.05),and yield and content of milk fat linearly increased(P<0.05)with LA supplementation.Percentages of C12:0,C18:1 and C20:1 fatty acids in milk fat linearly increased(P<0.05),but that of C16:0 fatty acid linearly decreased(P=0.046).Supplementation of LA led to a linear and quadratical increase(P<0.05)in digestibility of dry matter,organic matter,neutral detergent fibre and acid detergent fibre,and ruminal total volatile fatty acid concentration but a linear reduction(P=0.018)in the ratio of acetate to propionate.The enzymatic activities of ruminal pectinase,xylanase,andα-amylase,and populations of total bacteria and anaerobic fungi increased linearly(P<0.05),while populations of total protozoa and methanogens decreased linearly(P<0.05)with increased LA addition.Following LA addition,blood glucose,triglyceride,estradiol,prolactin,and insulin-like growth factor 1 concentrations increased linearly(P<0.05)and albumin and total protein concentrations increased quadratically(P<0.05).Moreover,addition of 200 g/d LA promoted(P<0.05)the expression of protein involved in mammary gland development and fatty acids synthesis.These results suggested that LA addition enhanced milk production and fatty acids synthesis by stimulating nutrient digestion,the expression of proteins associated with milk fat synthesis and mammary gland development.
基金financially supported by the Chunhui Project of the Ministry of Education of China (Z122007)
文摘The esterification of lauric acid with methanol could be efficiently catalyzed by ZrOCl2·8H2O, and this reaction was studied to develop a green method for biodiesel production. The influencing factors, such as amount of catalyst, reaction time and molar ratio of acid to methanol, were investigated. The results indicated that the ZrOCl2·8H2O catalyst showed high catalytic activity, and gave a 97.0% methyl laurate conversion rate under the following optimized conditions, viz.: a lauric acid/methanol molar ratio of 1:10, a catalyst dosage of 4%, and a reaction duration of 2 h at methanol refluxing temperature. The catalyst could be easily recovered while its activity could be well retained after three cycles. The ZrOCl2·8H2O catalyst also exhibited excellent catalytic activity for the esterification of different free long-chain fatty acids(including nonedible oils with high acid value) with different short carbon chain alcohols. Therefore, the ZrOCl2·8H2O catalyst has good potential for the synthesis of biodiesel from low-cost feedstocks such as waste vegetable oils and non-edible oils.
文摘The objective of this study was to establish the thermal characteristics of the lauric acid (95% purity) as a latent heat storage material filled in the annulus of vertical concentric double pipe during its melting process,The temperature data were used to determine the thermal characteristics,including the temporal temperature variations and the effects of the mass flow rate and the inlet temperature of the heat transfer fluid on the heat transfer coefficient and the heat charging fraction during the melting process,The results indicated that the time to reach to heat charging fraction of 1.0 could be altered by changing the mass flow rate and the inlet temperature of the heat transfer fluid.
