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首页> 外文期刊>Food research international >Influence of chemical interesterification on thermal behavior, microstructure, polymorphism and crystallization properties of canola oil and fully hydrogenated cottonseed oil blends
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Influence of chemical interesterification on thermal behavior, microstructure, polymorphism and crystallization properties of canola oil and fully hydrogenated cottonseed oil blends

机译:化学酯交换对芥花籽油和全氢化棉籽油混合物的热行为,微观结构,多态性和结晶性能的影响

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This work evaluated chemical interesterification of canola oil (CaO) and fully hydrogenated cottonseed oil (FHCSO) blends, with 20%, 25%, 30%, 35% and 40% (w/w) FHCSO content. Interesterification produced reduction of trisaturated and increase in monounsaturated and diunsaturated triacylglycerols contents, which caused important changes in temperatures and enthalpies associated with the crystallization and melting thermograms. It was verified reduction in medium crystal diameter in all blends, in addition crystal morphology modification. Crystallization kinetics revealed that crystal formation induction period and maximum solid fat content were altered according to FHCSO content in original blends and as a result of random rearrangement. Changes in Avrami constant (k) and exponent (n) indicated, respectively, that interesterification decreased crystallization rates and altered crystalline morphology. However, X-ray diffraction analyses showed randomization did not change the original crystalline polymorphism. The original and interesterified blends had significant predominance of β' polymorph, which is interesting for several food applications.
机译:这项工作评估了菜籽油(CaO)和全氢化棉籽油(FHCSO)混合物的化学酯交换作用,其中FHCSO含量为20%,25%,30%,35%和40%(w / w)。酯交换反应使三酰基甘油的含量降低,三酰基甘油的含量增加,单价不饱和和双不饱和甘油的含量增加,这引起了温度和焓的重要变化,与结晶图谱和熔融热谱图相关。验证了所有混合物中中等晶体直径的减小,以及晶体形态的改变。结晶动力学表明,原始共混物中的FHCSO含量和随机重排的结果改变了晶体形成诱导期和最大固体脂肪含量。 Avrami常数(k)和指数(n)的变化分别表明酯交换降低了结晶速率并改变了晶体形态。但是,X射线衍射分析显示随机化并没有改变原始的晶体多态性。原始的和酯化的混合物具有显着的β'多晶型优势,这在几种食品应用中都很有趣。

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