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对共轭亚油酸的生物学功能及共轭亚油酸在羊肉中的调控进行综述,旨在探索一种经济有效地调控羊肉中共轭亚油酸的方法,通过对共轭亚油酸的生物学功能及共轭亚油酸在羊肉中的不同调控方法进行比较分析,发现放牧饲养或增添草料是目前一种最为经济有效的调控方法,且对未来的羊肉产业具有重要的意义。 相似文献
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共轭亚油酸(conjugated linoleic acid,CLA)是一种具有多种生理活性的功能性脂肪酸,在食品、保健品中具有广阔的应用前景。然而,天然来源的CLA含量很低,不能满足人类需求。乳酸菌可以合成CLA,且广泛用于食品加工领域,利用乳酸菌开发富含CLA的功能食品是当今的研究热点。为推动CLA功能食品的研究开发,该文对合成共轭亚油酸乳酸菌的研究进展、合成共轭亚油酸乳酸菌的益生性研究以及将产CLA乳酸菌应用到食品和饲料中的研究现状进行综述,并对利用乳酸菌合成CLA进而应用于功能食品进行展望。 相似文献
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共轭亚油酸氧化稳定性及其影响因素的研究 总被引:7,自引:1,他引:6
研究了共轭亚油酸的氧化稳定性及其主要影响因素。共轭亚油酸氧化稳定性低于相应的油脂。变价金属离子(Fe∧3 能够促进共轭亚油酸氧化。考察了几种抗氧化剂对共轭亚油酸的抗氧化性能,BHT、BHA BHT(1:1)对共轭亚油酸的抗氧化效果优于实验的其他抗氧化剂,添加抗氧化剂可是明显改善共轭亚油酸的氧化稳定性。 相似文献
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以甘肃省陇南市油橄榄研究所种质资源基因库的‘城固32号’和‘莱星’油橄榄果为原料提取橄榄油,运用GC-MS、HPLC和E-Nose对不同品种与不同成熟度指数的橄榄油脂肪酸、酚类化合物及风味属性进行检测分析,以探究成熟度指数与不同品种橄榄油品质的关系。结果表明:随着成熟度指数的增大,‘城固32号’橄榄油中的硬脂酸、油酸、亚麻酸、饱和脂肪酸(SFA)含量及单不饱和脂肪酸/多不饱和脂肪酸(MUFA/PUFA)和油酸/亚油酸值呈下降趋势,亚油酸和不饱和脂肪酸(UFA)含量呈上升趋势,‘莱星’橄榄油中油酸和UFA含量及MUFA/PUFA和油酸/亚油酸值呈上升趋势,而亚油酸、亚麻酸和SFA含量呈下降趋势;油酸/亚油酸和MUFA/PUFA值在2个品种间存在差异,可作为鉴别‘城固32号’和‘莱星’橄榄油的依据;2个品种橄榄油中酪醇和总酚含量总体呈下降趋势,香草酸和木犀草素含量总体呈上升趋势,而羟基酪醇含量在‘城固32号’中总体逐渐减少,在‘莱星’中总体逐渐增加,木犀草苷含量在2个品种中保持稳定;风味物质的E-Nose信号响应值在2个品种中均显著减小。利用橄榄油中脂肪酸和酚类化合物的组成与含量以及风味属性的信号响应值差异结合主成分(PCA)分析可有效鉴别和区分不同成熟度指数的‘城固32号’和‘莱星’橄榄油。 相似文献
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Jung Mun Yhung Jung Dong Min Wu Ja Won Choi Dong Seong 《Food science and biotechnology》2011,20(3):725-733
Effects of catechins and green tea extract (GTE) on the photosensitized singlet oxygen oxidation of linoleic acid were studied.
Epigallocatechin gallate (EGCG) showed the highest antioxidant activity, followed by gallocatechin gallate, epigallocatechin,
and epicatechin in a decreasing order. α-Tocopherol showed strong antioxidative activity at the initial oxidation stage, but
its antioxidative property rapidly decreased with illumination time. EGCG showed significantly stronger antioxidative activity
than α-tocopherol at the later oxidation stage (p<0.05) due to the higher stability of EGCG. Unlike α-tocopherol, GTE possessed strong antioxidative activity even at the later
oxidation stage. Overall, GTE was a better antioxidant than α-tocopherol for the protection of linoleic acid from singlet
oxygen oxidation. Electron spin resonance (ESR) spectroscopy and visible-spectroscopic data showed unambiguous evidences that
the protective activity of GTE against the photosensitized oxidation of linoleic acid was due to the singlet oxygen quenching
mechanism. 相似文献
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Alfredo J. Rosas Romero Ian D. Morton 《Journal of the science of food and agriculture》1975,26(9):1353-1356
The kinetics of the autoxidation of oleic acid-linoleic acid mixtures have been investigated by the rate of oxygen uptake. Mixtures with different molar fractions were prepared, keeping the total number of moles constant. Oxidations were carried out at 30 °C and graphs were made of the percentage of oxidation against time, overall first order rate constant against molar fraction and overall second order rate constant against molar fraction. It was found that during the mono-molecular decomposition of hydroperoxides, the reaction rates decrease with decreasing linoleic acid molar fraction. No prooxidant or antioxidant effects were observed during this period, the predominant effect being that of oleic acid acting as a diluent for the oxidation of linoleic acid. When the reaction enters the period of bimolecular decomposition of hydroperoxides, a slight antioxidant effect was found, for mixtures containing less than 25% oleic acid. With increasing oleic acid concentration this effect levels off and gives way to a more marked prooxidant effect when the oleic acid is above 75%. 相似文献
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该文系统地介绍和评述了共轭亚油酸结构和性质。共轭亚油酸与亚油酸不仅在空间结构上不同,而且在理化性质和生理功能等方面也具有显著区别。共轭亚油酸经肠粘膜吸收渗入到血脂、细胞膜及脂肪组织,或者经过代谢进一步合成一系列活性物质而发挥重要生理功能。 相似文献
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为了探明摘薹对油菜籽粒品质性状的影响,本研究以21份甘蓝型油菜品系为材料,进行摘薹处理与正常收获,测定籽粒中饱和脂肪酸、不饱和脂肪酸、油份、蛋白质及硫苷含量变化。结果表明:摘薹后棕榈酸、硬脂酸、亚油酸、亚麻酸、蛋白质及硫苷含量表现为增加的趋势,油酸、油份含量表现为减少的趋势,芥酸、花生烯酸含量变化趋势并不明显。相关性分析表明,摘薹后油份与油酸呈极显著正相关,二者均与棕榈酸、硬脂酸、亚油酸、亚麻酸、蛋白质呈极显著负相关。主成分及隶属函数分析表明,摘薹后y15油菜品系籽粒综合性状最优良,y12、y10、y14、y6、y19、y11、y7、y13、y20、y3、y8品系次之,y4、y2、y9品系综合得分低于对照y21。 相似文献
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本试验以2013年收获的“源玉3”和“先玉335”玉米原粮为试验对象,测定了玉米原粮中脂肪含量、脂肪酸组成及脂肪酸值随储藏时间的变化。并对完整籽粒和胚芽中的脂肪酸含量进行了比较分析。试验结果表明,在储藏270 d时间中,脂肪含量分别下降14.25%和12.19%。棕榈酸和硬脂酸含量呈先上升后下降趋势。油酸、亚油酸和亚麻酸含量呈下降趋势。五种脂肪酸含量在胚芽中所占比例略高于在完整籽粒中所占的百分比,但是脂肪酸含量变化规律保持一致,无显著差异。2014年4月1日后,在本试验模拟粮仓储藏条件下,应用玉米胚芽提取玉米油的玉米原粮的适宜储藏期不宜超过210 d,但并不影响玉米原粮的宜存品质。 相似文献
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共轭亚油酸的功能性质及其应用前景 总被引:1,自引:0,他引:1
为了让共轭亚油酸在食品工业中被更广泛的应用,系统地介绍和评述了共轭亚油酸的分布及来源、光谱特征、层析、氧化稳定性、抗氧化性、吸收、代谢、转化及安全性,同时介绍了共轭亚油酸在食品工业中的应用前景。共轭亚油酸与亚油酸不仅在空间结构上不同,而且在理化性质和生理功能等方面也具有显著区别,共轭亚油酸经肠粘膜吸收渗入到血脂、细胞膜及脂肪组织,或者经过代谢进一步合成一系列活性物质而发挥重要的生理功能。 相似文献
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Frances M. Whittington Nicola J. Prescott Jeffrey D. Wood Michael Enser 《Journal of the science of food and agriculture》1986,37(8):753-761
Three groups of 15 female pigs were fed diets containing 0.8%, 1.1%, or 1.8% linoleic acid from 20 to 35 kg followed by 1.0%, 1.2% or 1.4% linoleic acid respectively from 35 kg to slaughter at 85 kg live-weight. Pigs grew at similar rates on all three diets and had similar proportions of carcass fat. The mean proportions of linoleic acid in the backfat lipids were 8.6%, 11.0%, and 13.9% respectively as the amount of the diet increased. There was a significant correlation between the concentration of linoleic acid in the inner backfat lipid and P2 backfat thickness for those animals on the high and medium linoleic acid diets but not for those on the low diet. Backfat from pigs fed the high linoleic acid diet was softer than that from the other two groups of pigs which could not be distinguished using the subjective finger probe method. Using a mechanical probe backfat consistency was distinguished between all three groups and was inversely correlated (r=?0.775, P<0.001) with the concentration of linoleic acid in the lipid. However, none of the pigs had fat which was too soft for bacon production based on either consistency data or linoleic acid content. If 15% linoleic acid is taken to be the maximum acceptable in bacon, then extrapolation of the regression of linoleic acid concentration on backfat thickness suggested that only the 1.4% linoleic acid diet is likely to result in unacceptably soft fat as pigs become leaner. However, this high concentration, although frequently present in current feeds, is not necessary since it is twice that recommended for normal growth and development of pigs. 相似文献