Samples of spray-dried soy milk powder were produced at various spray-dryer inletair temperatures and characterized. Soybean seed (Glycine max TAX 1448 – 2E Var.) was sorted, boiled for 40 min, manually dehulled, wet milled using plate mill and sieved with muslin cloth to obtain water soluble extract (soy milk). The soy milk was divided into two portions (samples A and B) and spray-dried using co-current spray dryer at a constant feed rate (20.5 ml/sec) but at air-inlet temperatures of 204oC and 260oC, respectively. Preliminary investigation carried out on this study showed that samples produced at air inlet temperatures below 200oC exhibited wet and agglomerated particles. The recovered powdered samples were analyzed for proximate composition, pH, available lysine, total solids, pack bulk density, viscosity, solubility and wettability at different reconstituting water temperatures, and sensory properties. Results showed that 38.60% and 45.55% yield (soy milk powder) were achieved at the end of the process for samples A and B respectively. The samples showed no significant differences (P ≥ 0.05) in some of these evaluated parameters such as fat, ash and pH. Soy milk powder showed high protein content (62.05±0.23%), fat (19.92±0.08%), ash (1.41±0.02 %) and available lysine (5.02±0.29%), but low carbohydrate content (12.85±0.01 %) and moisture (3.66±0.23%). The physical properties showed that the mean total solid of the samples was 10.33±0.33%, pack bulk density (0.57±0.00 g/ml), while the mean viscosity was 47 mpas. The sample spray-dried at 204oC had solubilities of 48% and 78% at reconstituting water temperatures of 40oC and 80oC, respectively while the sample produced at 260°C showed lower solubility of 38.46% and 45.01% when temperature of reconstitution were 40oC and 60oC, respectively. However, the sample produced at 260oC exhibited decreased solubility when the reconstituting water temperature was raised above 60oC. Its solubility was 40.39% at reconstituting water temperature of 70oC which further decreased to 38% at 80oC. The wettability of the samples steadily decreased as the reconstituting water temperature increased from 40 to 80oC. The wettability of the sample spray-dried at 204oC decreased from 36 to 22 sec, while that of sample spray-dried at 260oC decreased from 29 to 18 sec. Sensory scores showed that the sample spray-dried at 204oC was preferred to the sample spray-dried at 260oC.
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机译：在各种喷雾干燥器入口空气温度下生产喷雾干燥的豆奶粉样品并进行表征。将大豆种子（Glycine max TAX 1448 – 2E Var。）分选，煮沸40分钟，手动脱壳，用平板磨机湿磨，然后用平纹细布筛分，以获得水溶性提取物（豆浆）。将豆浆分为两部分（样品A和B），并使用并流喷雾干燥机以恒定的进料速度（20.5 ml / sec）但在进气温度分别为204oC和260oC的条件下进行喷雾干燥。对这项研究进行的初步研究表明，在进气温度低于200oC时产生的样品显示出湿的和团聚的颗粒。分析回收的粉末状样品的成分，pH，有效赖氨酸，总固体，包装堆积密度，粘度，溶解度和在不同重构水温度下的润湿性，以及感官特性。结果表明，样品A和B的处理结束时分别达到38.60％和45.55％的豆奶粉收率。在这些评估参数中的一些参数（例如脂肪，灰分和pH）上，样品没有显示出显着差异（P≥0.05）。豆奶粉的蛋白质含量高（62.05±0.23％），脂肪含量高（19.92±0.08％），灰分含量高（1.41±0.02％），赖氨酸含量高（5.02±0.29％），而碳水化合物含量低（12.85±0.01％）和水分（3.66±0.23％）。物理性质表明，样品的平均总固体为10.33±0.33％，堆积堆积密度（0.57±0.00g / ml），而平均粘度为47mpas。在复原水温度40oC和80oC时，在204oC喷雾干燥的样品的溶解度分别为48％和78％，而在260°C时产生的样品在40oC和60oC的溶解度下溶解度较低，分别为38.46％和45.01％。 ， 分别。但是，当将复原水温度提高到60oC以上时，在260oC下生产的样品的溶解度降低。在水温度为70oC时，其溶解度为40.39％，在80oC下进一步降低至38％。随着复原水温度从40oC升高到80oC，样品的润湿性稳定下降。在204°C喷雾干燥的样品的润湿性从36秒降低到22秒，而在260°C喷雾干燥的样品的润湿性从29秒降低到18秒。感官评分显示，在204oC喷雾干燥的样品比在260oC喷雾干燥的样品更好。
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