期刊文献+
共找到748篇文章
< 1 2 38 >
每页显示 20 50 100
Boosted Biodegradability and Tribological Properties of Mineral Base Oil by Methyl Diethanolamine Fatty Acid Esters 被引量:2
1
作者 Ding Jianhua Fang Jianhua +3 位作者 Chen Boshui Zhang Nan Fan Xingyu Zheng Zhe 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2018年第4期117-124,共8页
Methyl diethanolamine fatty acid esters, viz. methyl diethanolamine octanoate and methyl diethanolamine oleate,were prepared. Their impacts on the biodegradability and tribological properties of mineral base oil 400 S... Methyl diethanolamine fatty acid esters, viz. methyl diethanolamine octanoate and methyl diethanolamine oleate,were prepared. Their impacts on the biodegradability and tribological properties of mineral base oil 400 SN were evaluated by a tester for fast evaluating the biodegradability of lubricants and by a four-ball tester, respectively. The results showed that methyl diethanolamine octanoate and methyl diethanolamine oleate both could markedly promote the biodegradation of the oil and improved its tribological properties. The improvement of biodegradability was attributed to the enhanced growth and quantity of microbes by methyl diethanolamine fatty acid esters. The worn surfaces were analyzed by a scanning electron microscope(SEM) equipped with an energy dispersive spectrometer(EDS) and an X-ray photoelectron spectroscope(XPS). The results indicated that the enhancement of friction-reducing and anti-wear properties of the mineral oil was attributed to the formation of complicated boundary lubrication films composed of species such as Fe_2O_3, Fe_3O_4 and organic nitrogen-containing compounds with a structure of –C-N-or R-NH_2. 展开更多
关键词 BIODEGRADATION wear friction methyl DIETHANOLAMINE fatty acid esters
下载PDF
Epoxidation of Unsaturated Fatty Acid Methyl Esters in the Presence of SO_3H-functional Brφnsted Acidic Ionic Liquid as Catalyst 被引量:15
2
作者 蔡双飞 王利生 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2011年第1期57-63,共7页
The epoxidation of unsaturated fatty acid methyl esters(FAMEs)by peroxyacetic acid generated in situ from hydrogen peroxide and acetic acid was studied in the presence of SO3H-functional Brnsted acidic ionic liquid (I... The epoxidation of unsaturated fatty acid methyl esters(FAMEs)by peroxyacetic acid generated in situ from hydrogen peroxide and acetic acid was studied in the presence of SO3H-functional Brnsted acidic ionic liquid (IL)[C3SO3HMIM][HSO4]as catalyst.The effects of hydrogen peroxide/ethylenic unsaturation ratio,acetic acid concentration,IL concentration,recycling of the IL catalyst,and temperature on the conversion to oxirane were studied.The kinetics and thermodynamics of unsaturated FAMEs epoxidation and the kinetics of oxirane cleavage of the epoxidized FAMEs by acetic acid were also studied.The conversion of ethylenic unsaturation group to oxirane, the reaction rate of the conversion to oxirane,and the rate of hydrolysis(oxirane cleavage)were higher by using the IL catalyst. 展开更多
关键词 in situ epoxidation kinetics oxirane cleavage unsaturated fatty acid methyl esters Brnsted acidic ionic liquids
下载PDF
The Kinetics of the Esterification of Free Fatty Acids in Waste Cook- ing Oil Using Fe2(SO4)3/C Catalyst 被引量:7
3
作者 甘孟瑜 潘登 +2 位作者 马利 岳恩 洪建兵 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2009年第1期83-87,共5页
The esterification of free fatty acids(FFA) in waste cooking oil with methanol in the presence of Fe2(SO4)3/C(ferric sulfate/active carbon) catalyst was studied.The effects of different temperature,methanol/FFA mole r... The esterification of free fatty acids(FFA) in waste cooking oil with methanol in the presence of Fe2(SO4)3/C(ferric sulfate/active carbon) catalyst was studied.The effects of different temperature,methanol/FFA mole ratio and amount of catalyst on the conversion of FFA were investigated.The results demonstrated that under optimal esterification conditions the final acid value of the resultant system can be reduced to ~1(mg KOH)·g-1,which met fully the requirements in post-treatment for efficient separation of glycerin and biodiesel.The kinetics of the esterification were also investigated under different temperatures.The results indicated that the rate-control step could be attributed to the surface reaction and the esterification processes can be well-depicted by the as-calculated kinetic formula in the range of the experimental conditions. 展开更多
关键词 BIODIESEL KINETICS ESTERIFICATION free fatty acids waste cooking oil
下载PDF
Enzymatic synthesis, antioxidant ability and oil-water distribution coefficient of troxerutin fatty acid esters 被引量:1
4
作者 Yongmei Xiao Ming Li +2 位作者 Pu Mao Liangru Yang Lingbo Qu 《Grain & Oil Science and Technology》 2019年第3期78-84,共7页
Troxerutin fatty acid esters were prepared using troxerutin and fatty acid vinyl esters as substrates in pyridine through enzymatic route. The structures of as-prepared compounds were identified by FT-TR, NMR, and ESI... Troxerutin fatty acid esters were prepared using troxerutin and fatty acid vinyl esters as substrates in pyridine through enzymatic route. The structures of as-prepared compounds were identified by FT-TR, NMR, and ESI-HRMS. Using alkaline protease(≥30 mg/mL) as enzyme, maximum yields reached 58% at 3:1(vinyl hexanoate to troxerutin) in pyridine(water content ≤1%). The yields gradually declined as chain length of acyl donors rose. The antioxidation abilities of the as-obtained compounds were confirmed by both DPPH free radical scavenging and potassium ferricyanide reduction methods. The antioxidation ability of troxerutin fatty acid esters was found lower than that of troxerutin. However, the logP values of troxerutin fatty acid esters varied from 0.15 to 1.94, suggesting that troxerutin fatty acid esters had better lipophilicity than troxerutin(logP =-2.12) when compared to their oil-water distribution coefficients. Overall, these findings look promising as reference for further development of future troxerutin. 展开更多
关键词 TROXERUTIN ENZYMATIC synthesis fatty acid esters ANTIOXIDATION oil-water distribution COEFFICIENT
下载PDF
Biodiesel Production from Waste Cooking Oil Using Sulfuric Acid and Microwave Irradiation Processes 被引量:5
5
作者 Prafulla D Patil Veera Gnaneswar Gude +2 位作者 Harvind K. Reddy Tapaswy Muppaneni Shuguang Deng 《Journal of Environmental Protection》 2012年第1期107-113,共7页
A comparative study of biodiesel production from waste cooking oil using sulfuric acid (Two-step) and microwave-assisted transesterification (One-step) was carried out. A two-step transesterification process was used ... A comparative study of biodiesel production from waste cooking oil using sulfuric acid (Two-step) and microwave-assisted transesterification (One-step) was carried out. A two-step transesterification process was used to produce biodiesel (alkyl ester) from high free fatty acid (FFA) waste cooking oil. Microwave-assisted catalytic transesterification using BaO and KOH was evaluated for the efficacy of microwave irradiation in biodiesel production from waste cooking oil. On the basis of energy consumptions for waste cooking oil (WCO) transesterification by both conventional heating and microwave-heating methods evaluated in this study, it was estimated that the microwave-heating method consumes less than 10% of the energy to achieve the same yield as the conventional heating method for given experimental conditions. The thermal stability of waste cooking oil and biodiesel was assessed by thermogravimetric analysis (TGA). The analysis of different oil properties, fuel properties and process parametric evaluative studies of waste cooking oil are presented in detail. The fuel properties of biodiesel produced were compared with American Society for Testing and Materials (ASTM) standards for biodiesel and regular diesel. 展开更多
关键词 Biodiesel waste COOKING oil Free fatty acid Sulfuric acid MICROWAVE-ASSISTED TRANSESTERIFICATION
下载PDF
Supercritical Synthesis of Ethyl Esters via Transesterification from Waste Cooking Oil Using a Co-Solvent 被引量:1
6
作者 Tapaswy Muppaneni Harvind K. Reddy Shuguang Deng 《Journal of Environmental Protection》 2015年第9期986-994,共9页
Biofuels became more promising alternative to the fossil fuels because of the depletion of fossil resources, renewability, environmental benefits, and energy security. Ethanolysis of waste cooking oil with hexane as c... Biofuels became more promising alternative to the fossil fuels because of the depletion of fossil resources, renewability, environmental benefits, and energy security. Ethanolysis of waste cooking oil with hexane as co-solvent was carried out for the production of fatty acid ethyl ester (FAEE). This process reduced the severity of process parameters with high purity biodiesel yield. Process variables such as co-solvent ratio, ethanol to oil molar ratio, reaction temperature and reaction time were optimized. The maximum biodiesel yield of 88% was obtained at ethanol/oil molar ratio of 40:1, co-solvent (hexane) to oil ratio of 0.2% (v/v), reaction temperature of 300°C in 20 min of reaction time. Fatty acid ethyl ester (biodiesel) samples produced from this process were measured and evaluated using GC-MS analytical instrument. Thermo gravimetric analysis (TGA) was also performed to examine the thermal stability of waste cooking oil, ethyl esters and fuel blends. Fuel properties of ethyl esters were determined and compared with the ASTM standards for biodiesel, regular diesel and ethyl esters from different feedstock. 展开更多
关键词 fatty acid Ethyl esters SUPERCRITICAL ETHANOLYSIS CO-SOLVENT waste Cooking oil
下载PDF
Effects of Yttrium Doping on the Performance of Ru-Based Catalysts for Hydrogenation of Fatty Acid Methyl Ester 被引量:1
7
作者 Qi Lin Huirong Zheng +2 位作者 Guocai Zheng Xinzhong Li Benyong Lou 《International Journal of Organic Chemistry》 2014年第4期219-224,共6页
The highly dispersed supported ruthenium-yttrium (Ru-Y) bimetallic catalysts were prepared by impregnation method and their catalytic performance for hydrogenation of ester was fully investigated. The catalyst was cha... The highly dispersed supported ruthenium-yttrium (Ru-Y) bimetallic catalysts were prepared by impregnation method and their catalytic performance for hydrogenation of ester was fully investigated. The catalyst was characterized by X-ray diffraction and field emission scanning electron microscopy. The results show that the average particle diameter of the bimetallic crystallites was less than 10 nm. The effects of the reaction temperature, the hydrogen pressure, the amount of catalyst and the proportion of yttrium in catalyst on the hydrogenation of ester were studied. The experimental results show that the introduction of yttrium not only changed the chemical and textural properties of ruthenium-based catalyst but also controlled the formation of Ru-Y alloy. The Ru-Y catalyst (Ru-2%Y/TiO2) exhibited high catalytic activity and good selectivity towards the higher alcohols. Under optimal reaction conditions of 240°C and 5 MPa hydrogen pressure, the conversion of palm oil esters was above 93.4% while the selectivity towards alcohol was above 99.0%. 展开更多
关键词 Yttrium-Doped Ruthenium-Based Catalyst fatty acid methyl Ester HYDROGENATION
下载PDF
Ternary Liquid-Liquid Equilibrium for Systems of Fatty Acid Methyl Ester(Methyl Palmitate/Methyl Stearate)+Ethanol+Glycerol at Atmospheric Pressure
8
作者 夏淑倩 罗慧娟 马沛生 《Transactions of Tianjin University》 EI CAS 2015年第5期392-399,共8页
Liquid-liquid equilibrium data of two ternary systems methyl palmitate+ethanol+glycerol and methyl stearate+ethanol+glycerol at(318.2 and 333.2)K and atmospheric pressure were measured. The values of distribution coef... Liquid-liquid equilibrium data of two ternary systems methyl palmitate+ethanol+glycerol and methyl stearate+ethanol+glycerol at(318.2 and 333.2)K and atmospheric pressure were measured. The values of distribution coefficient and selectivity were calculated, which indicates that glycerol can be separated from fatty acid ester by using ethanol as an extraction solvent. The consistency of the isothermal tie-line data were checked by the Othmer-Tobias equation. The correlation coefficients R2 are higher than 0.993,9 for all the fitted curves. The NRTL activity coefficient model was applied to the correlation of the measured tie-line data. The root mean square deviation(RMSD)values are less than 0.007 for all the systems, which shows a good predictive capability of this model for such systems. 展开更多
关键词 liquid-liquid phase equilibrium fatty acid methyl ester ETHANOL NRTL model BIODIESEL
下载PDF
Investigation of performance and emission characteristics of waste cooking oil as biodiesel in a diesel engine 被引量:2
9
作者 Yahya Ulusoy Rldvan Arslan +3 位作者 Yucel Tekin Ali Surmen Alper Bolat Remzi Sahin 《Petroleum Science》 SCIE CAS CSCD 2018年第2期396-404,共9页
Biodiesel is one of the most popular prospective alternative fuels and can be obtained from a variety of sources. Waste frying oil is one such source along with the various raw vegetable oils. However, some specific t... Biodiesel is one of the most popular prospective alternative fuels and can be obtained from a variety of sources. Waste frying oil is one such source along with the various raw vegetable oils. However, some specific technical treatments are required to improve certain fuel properties such as viscosity and calorific value of the biodiesel being obtained from waste cooking oil methyl ester (WCOME). Various treatments are applied depending on the source and therefore the composition of the cooking oil. This research investigated the performance of WCOME as an alternative biofuel in a four-stroke direct injection diesel engine. An 8-mode test was undertaken with diesel fuel and five WCOME blends. The best compromise blend in terms of performance and emissions was identified. Results showed that energy utilization factors of the blends were similar within the range of the operational parameters (speed, load and WCOME content). Increasing biodiesel content produced slightly more smoke and NOx for a great majority of test points, while the CO and THC emissions were lower. 展开更多
关键词 waste cooking oil methyl ester BIODIESEL Alternative fuels Vehicle emissions
下载PDF
Determination of the Fatty Acid Profile of Breast Milk from Nursing Mothers in Bungoma County, Kenya
10
作者 Virate J. Kiprop Amy W. Girard +2 位作者 Lilian A. Gogo Mary N. Omwamba Symon M. Mahungu 《Food and Nutrition Sciences》 2016年第8期661-670,共10页
The fatty acid profile in breast milk of nursing mothers who participated in a Cohort for Vitamin A (COVA) study at the fourth and ninth month of lactation was investigated. Breast milk samples were collected by manua... The fatty acid profile in breast milk of nursing mothers who participated in a Cohort for Vitamin A (COVA) study at the fourth and ninth month of lactation was investigated. Breast milk samples were collected by manual expression and stored at - 20°C until analysis. The fat was extracted from the milk and methylated using the American Oil Chemists’ Society (AOCS) Official Methods with modifications. The separation, identification and quantification of the fatty acid methyl esters was performed by gas chromatography coupled with mass spectrometry (GC-MS). Fat contents of human milk increased significantly between the fourth and ninth month of lactation 0.38 and 1.21 mg·mL<sup>-1</sup> respectively;P 0.05) than the average percent of the total unsaturated FAs (48.93%). Similarly, at the 9th month the percentage average of the total saturated fatty acids (15.18%) was significantly lower (P < 0.05) than the average percent of the total unsaturated FAs (31.05%). The results obtained in this study demonstrated that the fat content in breast milk significantly increased in the 9th compared to the 4th month of lactation. The fatty profile was also significantly different with the omega 6 being the dominant at the 9th month compared with the omega - 9 being dominant at the 4th month of lactation. 展开更多
关键词 fatty acid Profile Breast Milk Nursing Mothers fatty acid methyl esters LACTATION
下载PDF
Waste Cooking Oil as a Substrate for Biodiesel Production
11
作者 Bronislaw Buczek 《Journal of Agricultural Science and Technology(B)》 2014年第6期493-500,共8页
The effectiveness of adsorptive treatment of waste cooking oils was assessed in terms of suitability for biodiesel production. New technologies involving standard diesel engines have been developed using biofuel produ... The effectiveness of adsorptive treatment of waste cooking oils was assessed in terms of suitability for biodiesel production. New technologies involving standard diesel engines have been developed using biofuel products from vegetable oils and waste animal fats based on environmental and economic considerations. The potential application of used rapeseed oil after treatment with a mixture of active carbon (AR) and magnesium silicate (MG) as energy source was studied. The results were compared with substrates standard in the Vogel&Noot GmbH technology for the transesterification of oils and fats. 展开更多
关键词 Cooking oil adsorptive purification fatty acid methyl esters
下载PDF
Production of biodiesel from palm fatty acid distillate using sulfonated-glucose solid acid catalyst:Characterization and optimization
12
作者 Ibrahim M.Lokman Umer Rashid Yun Hin Taufiq-Yap 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第11期1857-1864,共8页
A palm fatty acid distillate (PFAD) has been used for biodiesel production. An efficient sulfonated-glucose acid catalyst (SGAC) was prepared by sulfonation to catalyze the esterification reaction. The effect of t... A palm fatty acid distillate (PFAD) has been used for biodiesel production. An efficient sulfonated-glucose acid catalyst (SGAC) was prepared by sulfonation to catalyze the esterification reaction. The effect of three variables i.e. methanol-to-PFAD molar ratio, catalyst amount and reaction time, on the yield of PFAD esters was studied by the response surface methodology (RSM). The optimum reaction conditions were: 12.2:1 methanol-to- PFAD molar ratio, 2.9% catalyst concentration and 134 rain of time as predicted by the RSM. The reaction under the optimum conditions resulted in 94.5% of the free fatty acid (FFA) conversion with 92.4% of the FAME yield. The properties of the PFAD esters were determined according to biodiesel standards. 展开更多
关键词 Palm fatty acid distillate (PFAD)5ulfonated-glucose solid acid catalystEsterificationOptimizationPFAD methyl ester
下载PDF
Optimization for Community Biodiesel Production from Waste Palm Oil via Two-Step Catalyzed Process
13
作者 Athitan Timyamprasert 《材料科学与工程(中英文A版)》 2015年第5期238-244,共7页
关键词 生物柴油 棕榈油 催化法 优化 游离脂肪酸 硫酸催化剂 脂肪酸甲酯 实验设计
下载PDF
NiMoRe/HZSM-5催化剂的制备及其催化脂肪酸甲酯加氢脱氧
14
作者 郭效博 江文夺 +3 位作者 侯文彪 赵平 徐俊明 刘朋 《林产化学与工业》 CAS CSCD 北大核心 2024年第2期119-126,共8页
使用浸渍法制备了5 kg NiMoRe/HZSM-5催化剂,结合X射线衍射(XRD)、扫描电子显微镜(SEM)、电感耦合等离子原子发射光谱(ICP-OES)等表征手段对催化剂进行理化性质分析,并对该催化剂用于硬脂酸甲酯加氢脱氧反应的最佳条件进行探究。研究结... 使用浸渍法制备了5 kg NiMoRe/HZSM-5催化剂,结合X射线衍射(XRD)、扫描电子显微镜(SEM)、电感耦合等离子原子发射光谱(ICP-OES)等表征手段对催化剂进行理化性质分析,并对该催化剂用于硬脂酸甲酯加氢脱氧反应的最佳条件进行探究。研究结果表明:相比3种商用催化剂,NiMoRe/HZSM-5中金属Ni具有较小颗粒,且分散均匀,BET比表面积(S_(BET))更大,为239.1 m^(2)/g,具有更好的催化活性。在温度260℃、0.3 g催化剂用量、反应时间4 h、初始H 2压力3 MPa的最优反应条件下,原料转化率和烷烃选择性均为100%,且催化剂稳定性较佳,第5次循环原料转化率仍高达96.1%,加氢脱氧(HDO)反应的选择性(S HDO/DCO),即HDO反应与脱羧脱羰(DCO)反应的比值由1.2降至0.56。将催化剂NiMoRe/HZSM-5用于脂肪酸甲酯无溶剂条件下的加氢脱氧反应放大实验后进行中试,采用2.8 L固定床对25 kg脂肪酸甲酯进行连续加氢性能评价,经过15循环后脂肪酸甲酯的转化率达到98%。 展开更多
关键词 脂肪酸甲酯 中试 加氢脱氧 烃基生物柴油
下载PDF
丙磺酸型碗状碳微球制备及在餐厨废油酯交换反应中的性能研究
15
作者 薛媛 何水清 +1 位作者 袁红 周惠良 《化工新型材料》 CAS CSCD 北大核心 2024年第3期166-171,176,共7页
以碗状碳微球(BHC)为载体,合成了以烷基为磺酸基键合位点的丙磺酸型碗状碳微球(PA-CBHC-Si)。X射线光电子能谱仪、扫描电子显微镜和傅里叶变换红外光谱分析表明,三步改性分别逐步丰富BHC表面羧基(—COOH)、巯基(—SH)、磺酸基(—SO_(3)H... 以碗状碳微球(BHC)为载体,合成了以烷基为磺酸基键合位点的丙磺酸型碗状碳微球(PA-CBHC-Si)。X射线光电子能谱仪、扫描电子显微镜和傅里叶变换红外光谱分析表明,三步改性分别逐步丰富BHC表面羧基(—COOH)、巯基(—SH)、磺酸基(—SO_(3)H)官能团含量,且改性过程保留了载体的原始形貌。PA-CBHC-Si的酸密度高达8.5mmol/g,活性中心—SO_(3)H于300℃开始分解,具有良好的热稳定性。PA-CBHC-Si可作为煎炸废油与甲醇酯交换反应的催化剂,醇油摩尔比为16∶1,剂油比为0.02的催化体系于130℃反应4h,脂肪酸甲酯产率为84.53%。 展开更多
关键词 脂肪酸甲酯 碗状碳微球 丙磺酸 酸密度
下载PDF
黑水虻幼虫对脂质资源的处理和转化
16
作者 张志义 周俊锋 +1 位作者 王佳庆 王存文 《化学与生物工程》 CAS 北大核心 2024年第10期33-38,共6页
选取黑水虻幼虫(BSFL)为实验对象,分别用餐厨垃圾和分别添加椰子油、棕榈油、藻油、煎炸油的豆粕为基质饲养,采用气相色谱-质谱(GC-MS)法检测了不同油脂的脂肪酸组成以及BSFL油脂的脂肪酸组分动态变化,探究了不同链长脂肪酸和反式脂肪酸... 选取黑水虻幼虫(BSFL)为实验对象,分别用餐厨垃圾和分别添加椰子油、棕榈油、藻油、煎炸油的豆粕为基质饲养,采用气相色谱-质谱(GC-MS)法检测了不同油脂的脂肪酸组成以及BSFL油脂的脂肪酸组分动态变化,探究了不同链长脂肪酸和反式脂肪酸在BSFL体内的转化规律。结果表明,BSFL可以储存基质中的油脂,并将基质油脂中的其他脂肪酸转化为自身生长发育所必需的脂肪酸(如月桂酸、肉豆蔻酸、棕榈酸、油酸、亚油酸等),但该过程会影响其生长速度;同时,BSFL能对基质中的反式脂肪酸进行高效转化,转化率高达71.33%。 展开更多
关键词 黑水虻幼虫 餐厨垃圾 反式脂肪酸 油脂处理 脂肪酸转化
下载PDF
生物柴油原料中不皂化物和脂肪酸分析 被引量:1
17
作者 陈艳凤 曾建立 +2 位作者 杜泽学 赵敏 吴芳青 《中国油脂》 CAS CSCD 北大核心 2024年第4期83-87,共5页
旨在确定生物柴油原料的可利用性,以可作为生物柴油原料的木本植物油脂、餐饮废油和酸化油为研究对象,分析其不皂化物和脂肪酸组成及含量。结果表明:棕榈油等7种木本植物油脂不皂化物含量低于1.10%,脂肪酸含量均高于91.50%,脂肪酸组成... 旨在确定生物柴油原料的可利用性,以可作为生物柴油原料的木本植物油脂、餐饮废油和酸化油为研究对象,分析其不皂化物和脂肪酸组成及含量。结果表明:棕榈油等7种木本植物油脂不皂化物含量低于1.10%,脂肪酸含量均高于91.50%,脂肪酸组成以油酸、亚油酸和亚麻酸为主(除棕榈油外);餐饮废油的不皂化物含量变化较大,脂肪酸含量在83.99%~94.87%之间,大部分餐饮废油脂肪酸组成以亚油酸和亚麻酸为主;5种酸化油的脂肪酸含量在71.35%~92.05%之间,椰子酸化油饱和脂肪酸占比为80.06%,其他4种酸化油的脂肪酸组成以不饱和脂肪酸为主。综上,7种木本植物油脂是优良的生物柴油原料,餐饮废油和酸化油作为原料制备生物柴油时要严格控制其质量指标。 展开更多
关键词 生物柴油 不皂化物 脂肪酸 木本植物油脂 餐饮废油 酸化油
下载PDF
气相色谱法测定调制羊奶粉中37种脂肪酸
18
作者 张清 曾令英 +7 位作者 周娇 吴芸芸 李上 李南燕 兰姝姝 王贵敏 陈婷 房翠兰 《食品与发酵科技》 CAS 2024年第5期121-126,共6页
建立了气相色谱法(Gas Chromatography,GC)同时测定调制羊奶粉中37种脂肪酸的分析方法。样品经氨水水解,用乙醚-石油醚混合液(1∶1,v/v)提取,提取物经2%氢氧化钠-甲醇溶液皂化,15%三氟化硼-甲醇溶液甲酯化,正庚烷提取后用GC测定。37种... 建立了气相色谱法(Gas Chromatography,GC)同时测定调制羊奶粉中37种脂肪酸的分析方法。样品经氨水水解,用乙醚-石油醚混合液(1∶1,v/v)提取,提取物经2%氢氧化钠-甲醇溶液皂化,15%三氟化硼-甲醇溶液甲酯化,正庚烷提取后用GC测定。37种脂肪酸在各自的质量浓度范围内线性关系良好(R2>0.995),方法检出限为0.002~0.006 g/100 g,方法定量限为0.01~0.03 g/100 g。质控样的平均加标回收率为83.3%~108.5%,相对标准偏差为0.9%~5.6%(n=6)。该方法操作简便、准确可靠,用于测定市场购买的16组调制羊奶粉,结果发现市售调制羊奶粉中脂肪酸的组成及含量存在差异。 展开更多
关键词 气相色谱法 调制羊奶粉 脂肪酸 脂肪酸甲酯
下载PDF
超临界CO_(2)萃取石榴籽油及石榴酸甲酯富集 被引量:1
19
作者 任小娜 李兴梅 +1 位作者 吴江超 库尔班江·艾买提 《食品研究与开发》 CAS 2024年第8期85-90,共6页
采用超临界CO_(2)萃取技术从石榴籽中提取石榴籽油,对其脂肪酸和甘三酯组成和含量进行分析;通过单因素和正交优化试验研究尿素包合法富集石榴酸甲酯。超临界CO_(2)萃取技术与有机溶剂萃取相比更有利于获得高石榴酸含量的石榴籽油,石榴... 采用超临界CO_(2)萃取技术从石榴籽中提取石榴籽油,对其脂肪酸和甘三酯组成和含量进行分析;通过单因素和正交优化试验研究尿素包合法富集石榴酸甲酯。超临界CO_(2)萃取技术与有机溶剂萃取相比更有利于获得高石榴酸含量的石榴籽油,石榴籽油中检测出14种甘三酯。尿素包合法富集石榴酸甲酯的最佳工艺为尿素包合温度5℃、包合时间20 h、尿素与脂肪酸甲酯的质量比1∶1、尿素和95%乙醇的质量比1∶5,此最佳包合条件下获得的石榴酸甲酯的含量为78.82%。 展开更多
关键词 石榴籽油 石榴酸甲酯 尿素包合 石榴酸 超临界CO_(2)
下载PDF
气相色谱-氢火焰离子化测定脂肪酸甲酯的响应机理与定量规律
20
作者 崔华玲 杨慧 +7 位作者 孙丽华 叶倩 丁晨红 王威利 季天荣 马蕾 曾坤宏 殷秋妙 《食品科学》 EI CAS CSCD 北大核心 2024年第13期49-57,共9页
针对国内外现行标准中气相色谱-氢火焰离子化检测器(gas chromatography-flame ionization detector,GCFID)测定脂肪酸甲酯(fatty acid methyl esters,FAME)定量方法的不足,本实验通过理论推导和实验验证,从仪器、色谱柱、分流比、标准... 针对国内外现行标准中气相色谱-氢火焰离子化检测器(gas chromatography-flame ionization detector,GCFID)测定脂肪酸甲酯(fatty acid methyl esters,FAME)定量方法的不足,本实验通过理论推导和实验验证,从仪器、色谱柱、分流比、标准物质方面系统研究利用GC-FID分析37种FAME的响应规律、理论模型及实验干扰因素,提出“质量系数”和“关联因子”概念,揭示实验关联因子(experimental relevance factors,FF_(E))和理论关联因子(theoretical relevance factors,FF_(T))的函数关系和等值性条件,并经多个实验证实了关联因子的稳定性,发现当脂肪酸碳数大于10时,可充分利用理论质量系数(theoretical quality coefficient,QC_(T))和FFT对FAME进行相对或绝对定量;当脂肪酸碳数小于10时,可以通过现配FAME标准物质等方法精确测定实验质量系数(experimental quality coefficient,QC_(E))和实验关联因子FFE,并用此校正FAME的量进行定量,不仅能够提高定量结果的准确性,而且能够增加标准物质的使用时效以及节省标准物质的使用量。 展开更多
关键词 脂肪酸甲酯 甲酯化 气相色谱-氢火焰离子化检测 质量系数 关联因子
下载PDF
上一页 1 2 38 下一页 到第
使用帮助 返回顶部