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Y. Uma Devi H. R. Zaidi P. K. Saiprakash 《European Journal of Lipid Science and Technology》1984,86(2):74-76
Seed oils of S. emarginatus Vahl, Z. jujuba, A. excelsa and Delomix regia have been analysed. All the four oils are of semi drying nature and have a higher percentage of unsaturation. S. emarginatus and Z. jujuba are very similar in the composition of the unsaturated acids (67.0% and 65.6%). Oleic content is 56.5% and 53.0% respectively. The iodine value of S. emarginatus (93) is higher than the reported value of a closely related species S. trifoliatus (60.4). The composition of A. excelsa and D. regia are very much similar. A. exelsa has a high oleic acid content (65%) whereas higher fatty acids have not been found. In D. regia the peak for stearic acid is not present in our gas-liquid chromatogram. 相似文献
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Glycerolysis of palm and palm kernel oils were carried out using commercial lipases from Candida antarctica (Novozym 435) and Mucor miehei (Novozym 388) as catalyst (500 units lipase/g oil) at 40°C and with an oil:glycerol molar ratio of 1:2 in a solvent-free system. Novozym 435 catalyzed the glycerolysis of palm and palm kernel oils giving reaction products in similar compositions. Partial acylglycerols contents of the glycerolysis products obtained from palm and palm kernel oils were 64% (wt) and 66% (wt), respectively. However, partial acylglycerols contents of the glycerolysis products obtained from palm and palm kernel oils conducted with Novozym 388 as catalyst at the same conditions were 44% (wt) and 56% (wt), respectively. On the other hand, free fatty acid contents of the glycerolysis products of palm and palm kernel oils obtained using Novozym 388 were higher, 25–30% (wt), than those obtained by Novozym 435, 4–5% (wt). The monoacylglycerols fraction with the highest content of oleic acid, 62.7% (wt), was obtained from the palm kernel oil glycerolysis reaction catalyzed by Novozym 435. 相似文献
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Glycerolysis of palm and palm kernel oils were carried out using commercial lipases from Candida antarctica (Novozym 435) and Mucor miehei (Novozym 388) as catalyst (500 units lipase/g oil) at 40°C and with an oil:glycerol molar ratio of 1:2 in a solvent-free system. Novozym 435 catalyzed the glycerolysis of palm and palm kernel oils giving reaction products in similar compositions. Partial acylglycerols contents of the glycerolysis products obtained from palm and palm kernel oils were 64% (wt) and 66% (wt), respectively. However, partial acylglycerols contents of the glycerolysis products obtained from palm and palm kernel oils conducted with Novozym 388 as catalyst at the same conditions were 44% (wt) and 56% (wt), respectively. On the other hand, free fatty acid contents of the glycerolysis products of palm and palm kernel oils obtained using Novozym 388 were higher, 25-30% (wt), than those obtained by Novozym 435, 4-5% (wt). The monoacylglycerols fraction with the highest content of oleic acid, 62.7% (wt), was obtained from the palm kernel oil glycerolysis reaction catalyzed by Novozym 435. 相似文献
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Peck Hong Yap J. M. Deman L. Deman 《European Journal of Lipid Science and Technology》1989,91(5):178-180
Differential scanning calorimetry and pulsed nuclear magnetic resonance were used in the estimation of crystallization kinetics of palm oil and modified palm oils. Differential scanning calorimetry was found to be more sensitive and could differentiate between crystallization during cooling and crystallization during isothermal conditions. Hydrogenated palm oils crystallized quickly and completely when cooled from 60° to 20°C, while palm oil and fractionated palm stearin continued to crystallize when held isothermally at 20°C. 相似文献
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Assunta Raiola Gian Carlo Tenore Amalia Barone Luigi Frusciante Maria Manuela Rigano 《International journal of molecular sciences》2015,16(12):29250-29264
Several epidemiological studies have demonstrated that high vitamin E intakes are related to a reduced risk of non-communicable diseases, while other dietary antioxidants are not, suggesting that vitamin E exerts specific healthy functions in addition to its antioxidant role. In this regard, tomato (Solanum lycopersicum), one of the most consumed vegetables of the whole world population, is an important source of both tocopherols and tocotrienols. However, vitamin E content may strongly depend on several biotic and abiotic factors. In this review we will debate the elements affecting the synthesis of tocopherols and tocotrienols in tomato fruit, such as environmental conditions, genotype, fruit maturity level, and the impact of classical processing methods, such as pasteurization and lyophilization on the amount of these compounds. In addition we will analyze the specific vitamin E mechanisms of action in humans and the consequent functional effects derived from its dietary intake. Finally, we will examine the currently available molecular techniques used to increase the content of vitamin E in tomato fruit, starting from the identification of genetic determinants and quantitative trait loci that control the accumulation of these metabolites. 相似文献
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The steryl ester fraction of coconut and palm kernel oils has been separated and analysed by gas chromatography (GC) and high performance liquid chromatography (HPLC). The gas chromatograms of the steryl ester fractions of the oils are rather similar, but the liquid chromatograms show important differences which may represent a basis for distinguishing between the two oils. 相似文献
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Lipid Composition and Antioxidant Capacity Evaluation in Tilapia Fillets Supplemented with a Blend of Oils and Vitamin E 下载免费PDF全文
Fabiana Carbonera Paula Fernandes Montanher Ingrid Lima Figueiredo Elton Guntendorfer Bonafé Oscar Oliveira Santos Júnior Sheisa Cyléia Sargi Renata Menoci Gonçalves Makoto Matsushita Jesuí Vergílio Visentainer 《Journal of the American Oil Chemists' Society》2016,93(9):1255-1264
Since the nutritional value of farm‐raised fish fillets is directly related to the diet provided, we supplemented the diet of Tilapia (Oreochromis niloticus) with a blend of chia (Salvia hispanica L.) oil, tung (Aleurites fordii) oil, and conjugated linoleic acid (CLA) to evaluate the effects on the fatty acid composition. Vitamin E was also added to the diet to improve the antioxidant capacity of tilapia fillets. We observed an increase in α‐linolenic acid content (from 6.56 to 19.03 mg g?1 of total lipids), as well as the incorporation of CLA and conjugated linolenic acid (CLnA) isomers in the fillets. The addition of vitamin E resulted in the antioxidant capacity improvement of the fillets and higher values were found after 15 feeding days (39.25 µmol TE g?1 in the Ferric Reducing Ability Power assay). Supplementation proved to be an excellent tool to improve the nutritional value of fish fillets. 相似文献
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Chemical Composition,Anti-oxidant,and Antimicrobial Activities of Four Saline-Tolerant Plant Seed Oils Extracted by SFC 下载免费PDF全文
Qi Wei Yue Wei Haiwen Wu Xiuyan Yang Huangli Chen Huaxin Zhang 《Journal of the American Oil Chemists' Society》2016,93(9):1173-1182
The supercritical CO2 fluid extraction process was used to obtain seed oils. The compositional analyses of the seed oils of Amorpha fruticosa L., Caragana microphylla Lam and Elaeagnus angustifolia L. were performed by GC–MS, from which 18–22 fatty acid compositions were identified, and their main components were linoleic acid (49.10–66.39 %) and oleic acid (11.95–41.10 %). The seed oils were rich in unsaturated fatty acids, which accounted for 79.75–91.19 %. The in vitro anti‐oxidant activities of the seed oils were measured by the DPPH, ABTS and phosphomolybdenum complex assays. The IC50s of the seed oils were 6.5110–12.6599 mg/mL tested by DPPH assay, and the IC50s were in the range of 0.6872–1.9310 mg/mL tested by ABTS assay. The anti‐oxidant activities of seed oils decreased in the order of A. fruticosa > C. microphylla > E. angustifolia (A) > E. angustifolia (D). In vitro antimicrobial activities of seed oils against five bacteria were tested by microdilution method. The MIC values of the oils against Bacillus subtilis, E. coli, S. aureus, P. solanacearum and B. thuringiensis were in the range of 26–36, 30–38, 58, 56–58 and 56–58 mg/mL, respectively, while the MBC values were in the range of 30–40, 34–42, 58, 56–58 and 58 mg/mL, respectively. In vitro antifungal properties of the seed oils against four plant pathogenic fungi were tested by the mycelial growth rate method. The EC50s of seed oils against V. mali, C. gloeosporioides, F. graminearum and B. cinerea were in the range of 17.51–19.25, 15.58–19.12, 8.00–17.12 and 18.76–19.14 mg/mL, respectively. The seed oils showed moderate anti‐oxidant and antimicrobial activities. 相似文献
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Production of High Oleic Palm Oils on a Pilot Scale 总被引:1,自引:0,他引:1
Muhamad Roddy Ramli Wai Lin Siew Kien Yoo Cheah 《Journal of the American Oil Chemists' Society》2009,86(6):587-594
Refined, bleached and deodorized palm olein (RBD POo) with an iodine value (IV) of 62 was chemically interesterified with
methyl oleate (MO) at a ratio of 50:50 (w/w). The reaction was carried out at 110 °C in the presence of sodium methoxide as
a catalyst using a 100-kg pilot scale reactor. Randomization between 15 and 30 min resulted in less free fatty acid (FFA)
formation and higher oleic content in the interesterified product as compared to longer reaction time of 60–90 min. Sodium
methoxide-catalyzed ester interchange increased the oleic content of the interesterified product to more than 57% from its
initial content of 45%. The product obtained also has an IV of more than 75. The interesterified oil was then subjected to
dry fractionation in a 200-kg De Smet jacketed crystallizer at 8 °C to further enhance the oleic content of the liquid olein
fraction. The resulted olein had an improved cloud point and higher IV of 81. The solid stearin had a slightly higher IV and
oleic content as compared to normal palm stearin. The solid fat content was comparable to normal palm oil. The pilot scale
study has proven a successful conversion of laboratory findings to a larger scale production and gave the most realistic information
for possible commercialization. 相似文献
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赤桉和本泌桉叶精油的化学成分研究 总被引:4,自引:0,他引:4
用水蒸气蒸馏法提取了赤桉叶和本泌桉叶精油,通过气相色谱-质谱(GC-MS)联用法分析鉴定了二者的化学成分及质量分数。赤桉叶精油共鉴定出57种化合物,占总离子流出峰面积的94.81%,主要成分为w(1,8-桉叶油素)=50.17%,其后依次是w(α-蒎烯)=8.53%、w(蓝桉醇)=5.65%、w(乙酸松油酯)=3.69%、w(α-松油醇)=3.58%;本泌桉叶精油共鉴定出45种化合物,占总离子流出峰面积的90.93%,主要成分为w(α-蒎烯)=31.00%、w(蓝桉醇)=15.34%、w(香树烯)=13.80%和w(表蓝桉醇)=4.86%。 相似文献
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Martin Pengou Guy Bertrand Noumi Emmanuel Ngameni 《Journal of the American Oil Chemists' Society》2013,90(1):27-32
The physicochemical properties and chemical composition of oils extracted from two varieties of mature seeds of Allanblackia gabonensis and A. stanerana were assessed. The physicochemical properties of oils from Allanblackia gabonensis and A. stanerana were respectively 5.35 and 22.023 % for the water content; 68.15 and 69.87 % for the extraction yield on a dry basis; 0.35 and 0.30 mg KOH/g oil for the acid index; 35.57 and 29.75 g of I2/100 g oil for the iodine index; 1.3740 and 1.4150 for the refractive index. The fatty acid profile of those oils showed respectively four saturated fatty acids 60.61 and 70.94 %, two monounsaturated fatty acids 37.46 and 28.22 %, two polyunsaturated fatty acids 0.82 and 0.81 % for Allanblackia gabonensis and A. stanerana oils respectively. In both cases, fatty acids C18:0 and C18:1 were dominant. Most of the physicochemical properties showed significant variation (P < 0.05) from one oil to other, the difference being insignificant (P > 0.05) between the two chemical compositions. The analysis of these characteristics showed interesting application features for these oils. 相似文献
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Standard methods for the determination of iodine values of oils involve direct addition of halogen elements to the double bond. Since the reaction proceeds slowly there is a risk of substitution. A direct coulometrical titration method has been investigated. 相似文献
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蔬菜、水果中维生素C的测定方法有很多,如间接原子吸收分光光度法、分光光度法、高效液相色谱法等,各种方法各有特点。文章对近年来有关维生素C的测定方法进行了综述。 相似文献
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Abstract In this study antifungal activities of essential oils from wood and leaf and their constituents of Cunninghamia konishii against four wood decay fungi and six plant pathogenic fungi were investigated. GC and GC-MS analyses show that the major compounds of wood essential oil were cedrol and α-pinene, while those of leaf essential oil were α-pinene and p-cymene. Antifungal tests demonstrated the wood oil from C. konishii used against Trametes versicolor, Lenzites betulina, Laetiporus sulphureus, and Gloeophyllum trabeum and leaf oil from C. konishii used against L. sulphureus had strong antifungal activities. Moreover, wood oil used against Rhizoctonia solani, Fusarium solani, Pestalotiopsis funereal, and Ganoderma australe also had strong antifungal activities. Among the seven constituents of wood oil, cedrol displayed the best antifungal properties, indicating that it may be used as potential antifungal agents for the control of fungal diseases in plants. 相似文献
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