共查询到18条相似文献,搜索用时 234 毫秒
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研究不同加热时间和加热温度对食用油中脂肪酸各组分及其指标的影响.利用气相色谱检测了加热后油脂的反式脂肪酸生成量和各个脂肪酸含量变化,利用2,4-二硝基苯肼对羰基值进行了检测.结果表明,随着加热温度和加热时间的增加,不饱和脂肪酸的含量缓慢下降,饱和脂肪酸的含量上升,其中C16:0经过210℃3h后含量增加了0.572 9 g/L,与此相反,C18:2则下降了2.084 9 g/L.反式脂肪酸的含量和羰基值都呈上升趋势,反式C18:1和反式18:2含量经过210℃3h后分别增加了0.074 3 g/L和0.071 6g/L,经过210℃3h加热后羰基值为52.81 meq/kg,并且这种趋势随着温度的升高,变化更加剧烈,尤其在150℃后油脂的品质开始下降迅速,这样不利于人体健康.因此,建议日常烹饪过程中油温控制在150℃以下. 相似文献
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初榨橄榄油营养丰富且具保健价值,研究初榨橄榄油在烹调加热过程中品质的变化具有重要意义。采用仪器分析和化学分析法研究初榨橄榄油在加热过程中品质指标的变化。研究结果表明,初榨橄榄油在180℃加热过程中,脂肪酸值、过氧化值、羰基值、黏度逐渐增加,饱和脂肪酸和反式脂肪酸含量增加,不饱和脂肪酸含量下降。初榨橄榄油在180℃加热300 min时,过氧化值开始超标;加热480 min时,脂肪酸值、羰基值、反式脂肪酸含量仍未超标或超过推荐量。初榨橄榄油在180℃下加热烹调食品不宜超过240 min。如果要延长烹调加热时间,可以适当降低加热温度。该研究为初榨橄榄油在食品中的煎炸及含初榨橄榄油食品的高温处理提供科学参考。 相似文献
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通过模拟加热(180℃加热15、30 min)及家庭烹饪(炒青菜)过程,研究了一种富含不饱和脂肪酸、n-6/n-3脂肪酸比例适宜且有益脂质伴随物含量丰富的配方食用油的加热及烹饪稳定性。结果表明:配方食用油在加热或烹饪青菜时其酸值、过氧化值略有上升,但均远低于GB 2716—2018的规定;加热和炒菜过程中不会造成反式脂肪酸含量的增加,且苯并(a)芘含量远低于国标限量,说明在加热和炒菜过程中该配方食用油能够保持安全稳定;此外,配方食用油脂肪酸组成在加热或烹饪前后变化不大,n-6/n-3脂肪酸比例稳定,生育酚和总酚含量在加热和烹饪后下降幅度在35%以内,植物甾醇含量下降约12%。由此可知,配方食用油能够在常规家庭烹饪过程中保持稳定,是一种日常补充n-3多不饱和脂肪酸和有益脂质伴随物的有效途径。 相似文献
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为了探讨高温条件下油茶籽油中苯并芘和反式脂肪酸的形成规律进行了研究。试验测定了不同温度、时间、煎炸不同食材后2种油茶籽油中苯并芘和反油酸以及烟气中苯并芘的含量。结果表明高温条件下,油茶籽油中苯并芘含量未随加热时间延长而明显提高;但反油酸含量随加热时间和温度上升趋势明显。油茶籽油在180℃下煎炸香蕉、面条、瘦肉、豆腐等食材12 h后苯并芘含量大幅上升,且煎炸豆制品上升速度最快;压榨毛油煎炸香蕉和豆腐24 h后油中反油酸仍低于检出限(0.05%),而煎炸面条和瘦肉后,油中反油酸上升明显,分别达到1.9%和0.6%;浸提精炼油中煎炸4种食材后反油酸含量均有显著上升,上升幅度依次是面条豆腐香蕉瘦肉。 相似文献
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通过研究牡丹籽油经不同温度(90、120、150、180、210、240 ℃)加热30 min后脂肪酸组成、含量以及 理化性质的变化,探究高温加热对牡丹籽油品质的影响。结果表明:牡丹籽油在高温加热后会生成脂肪酸异构体、 环状脂肪酸以及中、短碳链脂肪酸,且温度越高种类越多。虽然上述高温加热后牡丹籽油各理化指标均符合食用油 标准,但是随着温度的升高,牡丹籽油不饱和脂肪酸含量下降,富含营养价值的α-亚麻酸含量在温度超过180 ℃时 迅速下降。可见,在理化指标上牡丹籽油具有良好的热稳定性,但是从营养角度其不适合用于高于180 ℃的高温煎 炸等烹调方式。 相似文献
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To assess an impact of heated edible oils on intake of trans fat, the formations of trans fatty acids (TFAs) in cooking conditions was estimated by a frying and heating model system. For the frying model, sliced raw potatoes (10% of the frying oil (w/w)) were fried in commercially available canola oil at 160, 180 and 200 °C, and the 10 frying cycles were performed. The TFAs contained both in fried potatoes and in frying oils were measured by gas chromatography (GC). Lipids content of raw potatoes was about 0.1% (w/w) and TFAs in the raw potatoes were negligible. On the other hand, fried potatoes contained lipids at the level of 8.8%–9.2% and their fatty acid composition was mostly in correspondence with that of the frying oil. The TFAs amount of potatoes fried by the tenth frying operation was at the level of 0.99–1.05 g/100 g lipids. When 100 g potatoes fried in this process were consumed, the TFAs intake was estimated at less than 0.1 g. After 10 frying operations, TFAs content, acid values and peroxide values of the frying oils were measured and compared with those of corresponding heated canola oils without food. The amounts of trans 18:1 FAs contained both in the frying oil and in heated oil were less than the quantitative limit (0.047 g/100 g oil). The increases of trans 18:2 FAs and trans 18:3 FAs of the used frying oil were 0.02 g/100 and 0.05 g/100 g, respectively, compared with those of the fresh oil. trans 18:2 FAs accumulation in the heated oil was slightly less than that in the frying oil. To elucidate TFAs accumulation in various edible oils during cooking, six kinds of commercially available edible vegetable oils were heated to 180 °C in glass test tubes. Small changes in TFAs amounts were observed after four hours heating. These results suggested that an ordinary frying process using unhydrogenated edible oils has little impact on TFAs intake from edible oils. 相似文献
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生育酚是天然脂溶性抗氧化剂维生素E的重要组成部分,广泛存在于各种食用油中。但在加热条件下,油脂中生育酚在参与延缓油脂氧化反应过程中自身会发生损耗、转化和迁移,其转化产物是否还具备抗氧化活性成为研究热点。针对中餐食用油以高温煎炸为主的使用习惯,研究生育酚在高温煎炸条件下的转化及抗氧化活性维持十分重要。结合油脂氧化机理,主要总结了油脂中生育酚的抗氧化机制,重点对加热条件下生育酚抑制油脂氧化机制相关研究进展进行综合分析,旨在为合理及正确使用脂溶性抗氧化剂维生素E、发挥其营养保健功效、维持油脂品质提供一定参考。 相似文献
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目的 分析两种常见餐饮用油(餐饮调和油A和餐饮调和油B)煎炸性能的差异,并对餐饮用油煎炸品质进行综合评估。方法 在模拟西式快餐实际油炸条件下进行煎炸薯条实验,考察了餐饮用油在油炸过程中十项品质指标,并利用主成分分析法(PCA)对两种餐饮用油在油炸过程中的煎炸性能进行综合评价。结果 餐饮用油品质指标间存在不同程度的相关性,PCA将10个品质指标缩减成2个综合性评价指标,累计贡献率达87.920%,反映了餐饮用油煎炸品质的大部分信息,并进一步提取出评估餐饮用油煎炸性能的5个关键指标,即过氧化值、极性组分、碘价、羰基值以及亚油酸/棕榈酸比值。主成分分析综合得分表明,在油炸过程中,餐饮调和油A得分较高,具有较好的煎炸性能。结论 本研究建立的餐饮用油煎炸性能评价体系为煎炸油的筛选和质量控制提供借鉴。 相似文献
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Raffaele Romano Anella Giordano Simona Vitiello Laura Le Grottaglie Salvatore Spagna Musso 《Journal of food science》2012,77(5):C519-C531
Abstract: Deep‐fat frying is an important method of food preparation in which foods are immersed in hot oil. Repeated use of frying oils is a common practice, and in the presence of atmospheric oxygen it produces various undesirable reactions in used oils. Stable frying oils usually require low linolenic acid (LnA < 3%), increased oleic acid (OA > 40%), and decreased linoleic acid (LA < 50%). The aim of this study was to establish the behavior of palm superolein (PSO) (OA 45%; LA 12.5%; LnA 0.2%) and olive oil (OO) during repeated, discontinuous deep frying of French fries. The behavior of the oils under controlled heating conditions was also studied by maintaining all of the process variables the same as those in deep frying, except that there was no food in the oil. The PSO selected to be tested in this study may represent an alternative to OO as a frying medium. Although PSO presented a faster increase in some oxidation indices, such as free fatty acid and total polar compounds, for other indicators, PSO showed better behavior than OO (less formation of C8:0 and lower peroxide value). Practical Application: The super palm olein selected for use in this study can be suggested as a suitable replacement for olive oil for frying and cooking purposes because it provides higher oxidative stability besides the beneficial effects of olive oil on human health. In fact, several studies have indicated that palm oil exhibits similar frying performance to high‐oleic oils, with the advantages of greater availability in the market and a lower price. 相似文献
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为研究热加工过程中食用油与NaCl反应产生3-氯-1,2-丙二醇酯(3-monochloropropane-1,2-diol ester,3-MCPD酯)和2-氯-1,3-丙二醇酯(2-monochloropropane-1,3-diol ester,2-MCPD酯)的变化规律,分别建立食品和煎炸油2个体系模型,考察食用油种类、NaCl含量、反应温度、反应时间、含水量和pH值等因素对2-MCPD酯和3-MCPD酯的含量影响。结果表明:2种模型反应中,食用油种类、反应时间、反应温度和NaCl含量对2-MCPD酯和3-MCPD酯的含量变化有着较大的影响;通过比较发现,在食品模型中,2-MCPD酯和3-MCPD酯的含量随反应温度的增加(100~190℃)呈现下降趋势,分别下降5%和20%,然而在煎炸油模型中,随反应温度的增加(100~220℃)两者呈现增加趋势,分别增加7倍和8倍。另外,随NaCl含量和反应时间的增加,2个模型反应中的2-MCPD酯和3-MCPD酯的含量变化趋势不完全一致。这说明2-MCPD酯与3-MCPD酯虽然结构近似,但消长规律不同。该研究结果可为有效减少热加工食品中氯丙醇酯的含量提供参考。 相似文献
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目的为更好地根据不同煎炸时间和煎炸食材选择合适的煎炸油,并确定合理的煎炸油更换频率,以最大程度降低煎炸油的劣化程度,保持煎炸油的良好卫生质量。方法本实验采用食用油品质检测仪对常用植物油中的总极性组分含量进行测定,对影响煎炸油极性组分含量的几点因素进行考察研究。结果不同煎炸时间、不同煎炸食材对总极性组分含量影响不同;不同植物油品种在煎炸过程中极性组分含量变化趋势不同;当已知极性组分含量初始值的油品以一定比例相互混合时,其极性组分含量初始值会发生可预期的改变。结论不同油品在煎炸过程中的极性组分含量与煎炸时间、油品中单不饱和脂肪酸含量、煎炸食品中碳水化合物含量和煎炸数量正相关;选择合适的煎炸油需要综合考虑油品极性组分初始值、极性组分在煎炸过程中的变化情况;根据不同品种食用油极性组分含量初始值的不同,可初步判断油品是否与其声称成分相符。 相似文献
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BackgroundDeep-fat frying is a common cooking method where fat or oil is used as the heat transfer medium, in direct contact with the food at a temperature above the boiling point of water. During the deep fat frying method, oil not only serves as a heating medium but also absorbs into food, increasing the total fat content. As a result, consumption of deep-fat fried foods has been associated with coronary heart diseases, obesity and type 2 diabetes. Selection of an appropriate food coating before frying may act as a barrier to moisture loss, which is important commercially, and also reduce fat uptake during frying.Scope and approachThis paper succinctly reviews different protein sources for edible coatings and compare them with muscle food proteins which were used in deep-fat fried foods.Key findings and conclusionsProtein-based coatings have been explored as potential coating materials in fat-uptake reduction. Comparatively, proteins are able to form films with better mechanical and barrier properties than polysaccharides. Application of muscle food proteins (myofibrillar proteins) as coatings, which are rich in these proteins, is novel and could be product-friendly for deep-fried muscle foods. 相似文献