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干燥方式对红薯叶粉品质特性的影响
司金金1, 辛丹丹1, 王晓芬,等1
西北农林科技大学 食品科学与工程学院
摘要:
【目的】筛选出红薯叶粉最佳干燥方式,为丰富红薯叶产品种类、延长货架期提供依据。【方法】采用热风干燥、微波干燥、真空冷冻干燥、喷雾干燥4种方式对红薯叶进行干燥并制粉,研究干燥方式对红薯叶粉物理特性、微观结构和成分含量的影响,并采用变异系数权重法对不同干燥方式得到的红薯叶粉进行综合评分。【结果】真空冷冻干燥和喷雾干燥红薯叶粉色差值较小,分别为3.98和3.86,均呈现较好的色泽;热风干燥红薯叶粉的堆积密度最大,为0.76 g/mL;喷雾干燥红薯叶粉吸湿性最小,为10.05%;真空冷冻干燥和喷雾干燥红薯叶粉均具有较小的中位径。喷雾干燥红薯叶粉的总糖和蛋白质含量分别为218.71及27.85 mg/g,显著高于其他3种干燥方式下的红薯叶粉(P<0.05);真空冷冻干燥红薯叶粉的总酚含量和黄酮含量最高,分别为52.22和48.46 mg/g。热风干燥、微波干燥、真空冷冻干燥、喷雾干燥4种干燥方式下红薯叶粉综合评分分别为-0.684,-0.275,0.450和0.508,可知喷雾干燥红薯叶粉品质最好,其次为真空冷冻干燥红薯叶粉。【结论】红薯叶粉干燥建议选择喷雾干燥方式。
关键词:  红薯叶粉  干燥方式  品质  综合评分
DOI:
分类号:
基金项目:陕西省农业科技攻关项目(K3310216125)
Effect of drying methods on quality characteristics of sweet potato leaf powder
SI Jinjin,XIN Dandan,WANG Xiaofen,et al
Abstract:
【Objective】This paper selected the best drying method for sweet potato leaf powder to provide basis for enriching the products of sweet potato leaves and extending the shelf life.【Method】The sweet potato leaves were dried by hot air drying,microwave drying,vacuum freeze drying and spray drying methods.The effects on physical properties and nutritional components of sweet potato leaf powder were studied,and the variation coefficient weight method was used to calculate comprehensive scores of sweet potato leaf powder.【Result】The color of sweet potato leaf powder prepared by spray drying and vacuum freeze drying were better with the color difference values of 3.98 and 3.86,respectively.The bulk density of sweet potato leaf powder prepared by hot air drying was the largest of 0.76 g/mL.Sweet potato leaf powder prepared by spray drying had the lowest hygroscopicity of 10.05%.Particle size of sweet potato leaf powder prepared by vacuum freeze drying and spray drying was small.Total sugar content and protein content of sweet potato leaf powder by spray drying were 218.71 and 27.85 mg/g,significantly higher than that of the other methods (P<0.05).The total phenol content and flavonoids content of sweet potato leaf powder by vacuum freeze-drying were the highest of 52.22 and 48.46 mg/g.The comprehensive scores of sweet potato leaf powder by hot air drying,microwave drying,vacuum freeze drying and spray drying were -0.684,-0.275,0.450 and 0.508,respectively.The quality of sweet potato leaf powder prepared by spray drying was the best,followed by vacuum freeze drying. 【Conclusion】 Spray drying was recommended for drying sweet potato leaf powder.
Key words:  sweet potato leaf powder  drying methods  quality  comprehensive score