Abstract The influence of spray drier inlet (180 and 200 °C) and outlet (80, 90 and 100 °C) air temperatures and storage parameters (22 and 40 °C, and 11%, 23% and 54% RH, for 6 months) on the characteristics of infant milk formula (IMF) powders was investigated. The combination of inlet–outlet temperatures affected the moisture content, water activity, particle size and glass transition temperature (Tg) in the freshly spray-dried IMF powders, whereas, powder surface composition and morphology were not affected. Powders remained stable for 6 months at 11 and 23% RH at both storage temperatures. Storage at 54% RH (at both storage temperatures) increased the moisture uptake by powders, decreased Tg below storage temperature, induced lactose crystallisation, increased surface fat and caking of powders, and reduced powder solubility. This study shows that inlet–outlet temperature combinations used during spray drying affect the stability of powders during storage by affecting their initial moisture content.

中文翻译：

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干燥温度和储存参数对喷雾干燥婴儿配方奶粉理化性质的影响

摘要 喷雾干燥机入口（180 和 200 °C）和出口（80、90 和 100 °C）空气温度和储存参数（22 和 40 °C，以及 11%、23% 和 54% RH，对于 6月) 对婴儿配方奶粉 (IMF) 的特性进行了研究。入口-出口温度的组合影响了新鲜喷雾干燥的 IMF 粉末的水分含量、水分活度、粒径和玻璃化转变温度 (Tg)，而粉末表面成分和形态不受影响。在两种储存温度下，粉末在 11% 和 23% RH 下保持稳定 6 个月。在 54% RH（两种储存温度）下储存会增加粉末的水分吸收，降低低于储存温度的 Tg，诱导乳糖结晶，增加粉末的表面脂肪和结块，并降低粉末的溶解度。