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Tengku Mohamad Tengku-Rozaina Edward John Birch 《Journal of the American Oil Chemists' Society》2013,90(8):1111-1119
Enrichment of the omega-3 (n-3) fatty acids of refined hoki oil (RHO) intact triglycerides (TG) and via free fatty acids (FFA), was carried out in the present study using established methods of dry fractionation (DF), low temperature solvent crystallization (LTSC) and urea complexation (UC) and positional distribution of fatty acids in the intact TG was determined by Nuclear Magnetic Resonance (NMR) analysis. Results showed that n-3 fatty acids were enriched in liquid fractions of all methods except DF, where the highest concentration was obtained via the UC method (83.00 %). The FFA form of the oil produced a higher concentration (40.81 %) of n-3 fatty acids via the LTSC method compared to the TG form (31.50 %). The percentages of the total saturated fatty acid (SFA) in the liquid fractions in all methods were lower, ranging from 1.60 % (UC) to 21.44 % (DF) compared to the RHO parent oil (24.05 %). The percentages of total monounsaturated fatty acids (MUFA) in the liquid fractions were similar to the solid fractions except for the UC method where total MUFA was six times higher in the solid fraction. In LTSC-FFA and UC methods, the enrichment factor for EPA was lower, ranging from 1.61 (LTSC-FFA) to 2.83 (UC), than DHA which ranged from 1.64 (LTSC-FFA) to 3.88 (UC). EPA was preferentially located at the sn-1,3 position and DHA was significantly located at the sn-2 position which is the favoured location for intestinal digestion. 相似文献
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分子蒸馏富集海狗油中多不饱和脂肪酸 总被引:5,自引:0,他引:5
海狗油中富含多不饱和脂肪酸,如二十碳五烯酸(EPA)、二十二碳五烯酸(DPA)、二十二碳六烯酸(DHA)等。用分子蒸馏法对海狗油中多不饱和脂肪酸进行富集,通过控制适宜的温度和压力等条件,得到较为满意的分离效果。当进料速率为80 mL/h,预热温度为80℃,刮膜器转速为250r/min,蒸馏温度为120℃,压力为15 Pa时,经过一级分子蒸馏,得到EPA、DPA和DHA的总含量为54.86%(质量分数)的海狗油产品,收率为92.7%,并用气相色谱法测定了产品的脂肪酸组成。 相似文献
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Filip Hromcik Jan Vokurka Michal Kyr Lydie Izakovicova Holla 《European Journal of Lipid Science and Technology》2021,123(2):2000259
The topical application of aspirin and omega-3 polyunsaturated fatty acids (PUFAs) may trigger the resolution of inflammation by inducing the biosynthesis of pro-resolvers such as lipoxins and resolvins while also avoiding the side effects of systemic aspirin intake. This study assessed the effect of enhanced granulation tissue (EGT) on periodontal tissue regeneration through the local application of aspirin and omega-3 PUFAs directly to granulation tissue (GT) during periodontal surgery. This randomized controlled experiment assesses 38 pockets in 19 patients. In every patient, two similar intrabony periodontal defects are treated with an open flap debridement, one with EGT (GT extracted, enhanced with aspirin and omega-3 PUFAs, and replaced) and the other with standard GT removal. Clinical attachment level (CAL) and probing pocket depth (PPD) are assessed at baseline and 2 and 6 months after surgery. The experimental protocol (EGT) results in a greater CAL gain as compared to that in the controls at 6 months (p < 0.05), while PPD reduction is not affected. The retained GT does not compromise healing. EGT is proposed as a promising, inexpensive, and simple method that may improve the outcome of periodontal regenerative treatment. However, the described protocol requires optimization and further assessment. Practical Applications : The biosynthesis of mediators including resolvins and lipoxins triggered by aspirin and omega-3 PUFAs promote the resolution of inflammation, eventually leading to faster regeneration of inflamed tissues. While granulation tissue is a necessary component in wound healing, enhancing granulation tissue with aspirin and omega-3 PUFAs results in CAL gain in the surgical treatment of periodontal defects. Retained granulation tissue does not compromise periodontal healing. The EGT strategy is an inexpensive and simple method that may improve the clinical outcomes of regenerative periodontal procedures. 相似文献
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《分离科学与技术》2012,47(8):2072-2089
Abstract In this paper, we demonstrate that the hydrophobic ionic liquid (IL) such as 1-hexyl-3-methyl imidazolium hexafluorophosphate, [hmim][PF6], with silver salt, e.g. AgBF4, is an excellent extraction phase to separate and enrich omega-3 polyunsaturated fatty acid methyl esters (PUFAMEs) from the mixed solution containing closely related saturated, monounsaturated or diunsaturated fatty acid methyl esters. With this silver salt-ionic liquids extraction phase, the health-beneficial omega-3 PUFAMEs such as methyl ester of all-cis-5,8,11,14,17-eicosapentaenoic acid (20:5 or EPA) and methyl ester of all-cis-4,7,10,13,16,19-docosahexaenoic acid (22:6 or DHA) were largely enriched from 18% (wt %) in the original cod liver oil to greater than 80% in the 1-hexene stripping solvent. The unique properties of nonvolatility and adequate polarity allow ILs to dissolve or suspend silver salts and to be conveniently adopted as extraction phase in separating PUFAMEs. The ILs with different hydrophobicities and different silver salts were screened to obtain an optimal combination of IL and silver salt with the highest extraction capability and selectivity. The screening results showed that AgBF4 exhibited high extraction capability in the hydrophobic ILs but little or no extraction capability in the hydrophilic ILs. Furthermore, the high extraction capability of AgBF4 in hydrophobic ILs was much greater than that of AgBF4 in traditional silver-water or silver-alcohol extraction systems. Pretreating the silver-ILs extraction phase with steric hindered short chain olefins could significantly enhance its extraction selectivity for PUFAMEs. Nine runs of the IL-silver extraction phase showed no obvious decrease in its extraction capabilities and selectivities. 相似文献
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稀油密封型干式储气罐的密封油,在循环使用中会出现乳化变质,通过对乳化机理和原料的分析,提出了破乳方法和破乳剂的选择方案。 相似文献
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充分利用原设计结构的特点及波齿复合垫的优异密封性能 ,对油浆蒸汽发生器的密封进行了改造 ,避免了难度较高的机械加工 ,取得了满意的效果 相似文献
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Antioxidant Efficacy of a New Synergistic,Multicomponent Formulation for Fish Oil Omega-3 Concentrates 下载免费PDF全文
Vidar Moen Iren Stoknes Harald Breivik 《Journal of the American Oil Chemists' Society》2017,94(7):947-957
Today, tocopherols serve as the industrial standard antioxidant protection for fish oil omega-3 concentrates. Synergistic interactions between tocopherols, ascorbyl palmitate and natural polyphenols extracted from plant sources have been demonstrated in model systems. The main goal for this work was to develop a mix of such antioxidants with improved efficacy in the context of preserving industrial marine oil concentrates. The antioxidant formulation comprises tocopherols, ascorbyl palmitate, rosemary extract and green tea catechins. Part of the scope was to develop a method for dissolving green tea catechins in oil. The key element of the method is to introduce green tea on a lipid insoluble carrier when dissolving the extract in the oil, and thereafter remove the carrier by filtration. The antioxidant mix was tested against tocopherol in omega-3 concentrates of minimum 300 mg/g eicosapentaenoic acid (EPA) plus 200 mg/g docosahexaenoic acid (DHA) in the form of triacylglycerides and ethyl esters. The mix was superior compared to tocopherols in suppressing both primary- and secondary oxidation. Weight increase measurements of oil in contact with air correlated well with standard oxidation tests within individual samples and the method was considered simple and useful for monitoring oxidation in omega-3 concentrates. 相似文献
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Stearidonic Acid-Enriched Soybean Oil Increased the Omega-3 Index, an Emerging Cardiovascular Risk Marker 总被引:1,自引:0,他引:1
Harris WS Lemke SL Hansen SN Goldstein DA DiRienzo MA Su H Nemeth MA Taylor ML Ahmed G George C 《Lipids》2008,43(9):805-811
A plant source of omega-3 fatty acid (FA) that can raise tissue eicosapentaenoic acid (EPA) and/or docosahexaenoic acid (DHA) is needed. A soybean oil (SBO) containing approximately 20% stearidonic acid [SDA; the delta-6 desaturase product of alpha-linolenic acid (ALA)] derived from genetically modified soybeans is under development. This study compared the effects of EPA to SDA-SBO on erythrocyte EPA+DHA levels (the omega-3 index). Overweight healthy volunteers (n=45) were randomized to SDA-SBO (24 ml/day providing approximately 3.7 g SDA) or to regular SBO (control group) without or with EPA ethyl esters (approximately 1 g/day) for 16 weeks. Serum lipids, blood pressure, heart rate, platelet function and safety laboratory tests were measured along with the omega-3 index. A per-protocol analysis was conducted on 33 subjects (11 per group). Compared to baseline, average omega-3 index levels increased 19.5% in the SDA group and 25.4% in the EPA group (p<0.05 for both, vs. control). DHA did not change in any group. Relative to EPA, SDA increased RBC EPA with about 17% efficiency. No other clinical endpoints were affected by SDA or EPA treatment (vs. control). In conclusion, SDA-enriched SBO significantly raised the omega-3 index. Since EPA supplementation has been shown to raise the omega-3 index and to lower risk for cardiac events, SDA-SBO may be a viable plant-based alternative for providing meaningful intakes of cardioprotective omega-3 FAs. 相似文献
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Vandal M Freemantle E Tremblay-Mercier J Plourde M Fortier M Bruneau J Gagnon J Bégin M Cunnane SC 《Lipids》2008,43(11):1085-1089
Little information is available concerning whether incorporation of dietary omega-3 fatty acids into plasma lipids changes
during healthy aging. Elderly (74 ± 4 years old) and young (24 ± 2 years old) adults were given a fish oil supplement for
3 weeks that provided 680 mg/day of docosahexaenoic acid and 320 mg/day of eicosapentaenoic acid, followed by a 2 week wash-out
period. Compliance was monitored by spiking the capsules with carbon-13 glucose, the excretion of which was measured in breath
CO2. In response to the supplement, plasma docosahexaenoic acid rose 42% more in the elderly but eicosapentaenoic responded similarly
in both groups. Despite raising docosahexaenoic acid intake by five to tenfold, the supplement did not raise plasma free docosahexaenoic
acid (% or mg/dL) in either group. We conclude that healthy aging is accompanied by subtle but significant changes in DHA
incorporation into plasma lipids. 相似文献
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炼油厂一车间蜡催装置公司级设备402主风机组,风机后油封存在漏油现象,如不彻底清除该隐患,润滑油漏量大时与烟气接触很容易造成火灾事故,也会给机组的平稳运行带来重大的生产隐患。 相似文献
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基于油封"新月面理论"和微型泵理论的密封机理,从油封结构和油封用橡胶材料两方面论述了油封的密封性能与两者的关系。展望了油封技术的发展趋势。 相似文献
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Gloria Fernández-Lorente Lorena Betancor Alfonso V. Carrascosa Jose M. Palomo Jose M. Guisan 《Journal of the American Oil Chemists' Society》2012,89(1):97-102
Three different lipases (from Candida antarctica fraction B (CALB), Thermomyces lanuginose (TLL), and Rhizomucor miehei (RML)) were immobilized by two different methods, immobilization on CNBr-activated Sepharose via a mild covalent immobilization
or adsorption onto hydrophobic supports (Octyl-Sepharose). These immobilized preparations were chemically and physically modified
on the protein surface (enzyme carboxylic groups with ethylenediamine, amino groups with succinic anhydride, or coating with
polyethyleneimine).The activity and selectivity in the production of eicosapentaenoic acid (EPA) and docosahexaenoic acid
(DHA) by enzymatic hydrolysis of sardine oil were evaluated. Activity and selectivity were dependent on the different lipases,
the immobilization protocols, the modification methods, and the pH of the reaction media. The selectivity (EPA/DHA ratio)
of RML immobilized on CNBr-activated Sepharose was increased after succinylation from 7.5 to 34 at pH 6.0. The selectivity
of octyl-RML improved from 1.5 to 8.5 when pH was increased from 6 to 8. The selectivity and activity of octyl-TLL increased
twofold after PEI coating at pH 6. The properties of CAL-B derivatives were slightly altered after modification. 相似文献
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W. M. N. Ratnayake B. Olsson D. Matthews R. G. Ackman 《European Journal of Lipid Science and Technology》1988,90(10):381-386
The effect of weight ratio of urea to fatty acids and the urea-fatty acid adduct crystallization temperature on the enrichment of eicosapentaenoic acid from marine oil fatty acids was studied. The optimum ratio of urea to fatty acids was found to be 3 : 1 for laboratory scale preparations and the optimum temperature for the formation of urea-fatty acid adduct was 1°C. At very low temperatures (?12, ?18, ?35°C) the recovery efficiency for EPA was reduced. Using these optimum values, enrichment of EPA and other n-3 polyunsaturated fatty acids via urea complexation was carried out on a pilot plant scale in a variety of North Atlantic and North Pacific fist oils and a seal oil. Irrespective of hte type of starting oil, all the oils gave a concentrate with 69–85% total n-3 PUFA with an overall yield of 17–20%. Menhaden is clearly an ideal oil for preparation of EPA concentrate, as the starting oil usually has a higher proportion of EPA to DHA than most of the other commercial fish oils. 相似文献