摘要
采用静态恒重法测定金针菇在15℃,25℃和35℃下,0.1～0.9水分活度范围内的水分吸着等温线。用GAB,BET,Caurie,Halsey,Henderson,Oswin,Smith,Modified chung-pfost及Modified mizrahi方程、经非线性回归拟合金针菇的水分吸着数据。结果表明,在所研究的温度与水分活度范围内,Hendenson方程对试验数据的拟合效果最佳,金针菇的吸着等温线呈S型,属于Ⅱ型等温线,对水分的吸着能力随温度升高而降低。按GAB,BET与Caurie方程得出的单分子层值均随温度升高而降低。金针菇的单分子层值适合用GAB模型求取,在15℃,25℃和35℃下,吸着过程的单分子层值分别为0.065 85 g/g,0.055 29 g/g和0.048 42 g/g。
The moisture sorption isotherms of Flammulina velutipes were determined using the gravimetric static method at 15 ℃, 25 ℃ and 35 ℃ and within the range of 0.1～0.9 water activity. The adsorption data were analyzed using mathematical equations of GAB, BET, Caurie, Halsey, Henderson, Oswin, Smith, Modified chung-pfost and Modified mizrahi by nonlinear regression analysis method. The best fit of experimental data was obtained with Henderson in the range of temperatures and water activities investigated. The moisture adsorption sotherms obtained were type II sigmoidal, with the sorption capacity decreasing with increasing temperature. The monolayer moisture content values of samples calculated by GAB, BET and Caurie equations decreased with increasing temperature. GAB equation was better than BET and Caurie equations in fitting the monolayer moisture content values. The monolayer moisture content values of Flammulina velutipes at 15 ℃, 25 ℃ and 35 ℃ from GAB adsorption isotherms were 0.065 85 g/g, 0.055 29 g/g and 0.048 42 g/g, respectively.
出处
《食品工业》
北大核心
2014年第10期135-139,共5页
The Food Industry
基金
长江大学科研创新基金项目(39210144)
关键词
金针菇
水分吸着等温线
拟合模型
单分子层值
Flammulina velutipes
moisture sorption isotherm
fitting model
monolayer moisture content values
