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首页> 外文期刊>Journal of Food Science >Effects of Processing on Structure and Thermal Properties of Powdered Preterm Infant Formula
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Effects of Processing on Structure and Thermal Properties of Powdered Preterm Infant Formula

机译:加工工艺对粉状婴儿配方奶粉结构和热性能的影响

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Powdered infant formula is usually manufactured by ingredients mixing, homogenization, pasteurization, evaporation and spray drying. Effects of unit operations on the microstructure, thermal properties and other characteristics of preterm infant formula, fat (F), serum (S), and pellet (P) fractions on centrifugation were investigated using Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Differential Scanning Calorimetry (DSC), and Fourier Transform Infrared (FTIR) spectroscopy. After homogenization, particles which may be casein and denatured whey proteins were observed on the surface of F fraction in microstructure images. DSC results showed that the onset temperature of the second endothermic peak of F fraction shifted to higher temperature, and an endothermic transition appeared at 173.3 ℃ in P fraction. The -CH_2 group corresponding to F fraction showed less intensity in FTIR spectrum after homogenization. Microstructure images for S and P fractions showed larger aggregates due to the pasteurization processing. Apparent exothermic transition in DSC curve occurred at 101.6 ℃ indicated whey protein aggregation. Spray drying resulted in some open areas in F fraction and lager aggregates in S fraction revealed by microstructure pictures. A new exothermic transition appeared at 93.6 ℃ in DSC curve of S fraction. Changes in amide I and amide II regions in FTIR spectra of samples resulted from pasteurization and spray drying indicated the changes in secondary structure of casein and whey proteins. All results indicated that homogenization, pasteurization, and spray drying exhibited pronounced impacts on the microstructure, thermal properties and structural characteristics of samples.
机译:婴儿配方粉通常通过成分混合,均质化,巴氏灭菌,蒸发和喷雾干燥来制造。使用扫描电子显微镜(SEM),透射电镜(SEM)研究了单位操作对早产婴儿配方食品,脂肪(F),血清(S)和颗粒(P)组分在离心过程中的微观结构,热性能和其他特性的影响。 TEM),差示扫描量热法(DSC)和傅立叶变换红外(FTIR)光谱。均质化后,在微结构图像中的F级分表面上观察到可能是酪蛋白的颗粒和变性乳清蛋白。 DSC结果表明,F级分第二个吸热峰的起始温度向较高温度移动,P级分在173.3℃出现吸热转变。均质后,对应于F分数的-CH_2基团在FTIR光谱中的强度较小。由于巴氏灭菌处理,S和P组分的显微图像显示出较大的聚集体。 DSC曲线在101.6℃出现明显的放热转变,表明乳清蛋白聚集。喷雾干燥导致F馏分中有一些开放区域,而S馏分中有较大的聚集体(通过显微组织照片显示)。 S分数的DSC曲线在93.6℃出现了新的放热转变。巴氏灭菌和喷雾干燥导致样品的FTIR光谱中酰胺I和酰胺II区的变化表明酪蛋白和乳清蛋白的二级结构发生了变化。所有结果表明,均质化,巴氏灭菌法和喷雾干燥对样品的微观结构,热性能和结构特征表现出显着影响。

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