电子鼻测定榴莲果肉臭味气体的模型建立及应用

Establishment and application of the model for detecting the odor of durian pulp

利用PEN3便携式电子鼻检测榴莲果肉的臭味响应值,并运用密封、打孔的方法使信号曲线能较快的达到平稳状态。通过PCA分析确定榴莲果肉臭味的第一主成分和第二主成分的总贡献率达到99.49%,而且0孔、8孔、16孔三种不同孔数处理的榴莲果肉臭味有明显差异,所以,电子鼻识别榴莲果肉臭味可行;通过Loadings分析认为硫化物是榴莲果肉臭味气体的主要成分;根据检测到的数据,利用PLS法建立了榴莲果肉臭味气体相对含量的模型,运用统计软件建立了PLS线性拟合曲线,得到0孔、8孔、16孔的相对含量拟合的线性相关系数为0.997,说明榴莲果肉臭味气体相对含量与电子鼻输出信号之间有较好的线性关系;测得0孔、8孔、16孔的相对含量的平均相对误差均小于10%。因此,本文所建模型可准确地测定榴莲果肉臭味气体的相对含量,从而提供一种评定榴莲臭味的实用方法。

The response values of the odor of durian pulp were detected by PEN3 portable E-nose.The method of sealing and punching was applied to make the signal curve reach steady much faster.The total contribution of the first and the second principal component of the durian pulp was 99.49% by PCA, and the odors of the three samples were obviously different.It was feasible to identify the differences between the odors with different levels of durian pulp by E-nose.The result of Ioadings was that sulfide was the main component.According to the data detected, a model of measuring the relative content of the odor was established by the method of PLS and a linear fitting curve of which the correlation coefficient was 0.99？ was drawn up by statistical software.This showed that there was a good linear relationship between the relative average relative errors of the samples with 0 hole,8 holes paper, the model can accurately determine the relative practical method to evaluate durian odor. content of the odor and the output signal of E-nose.The and 16 holes were 6.3% ,6.5% and 6.7%.Therefore, in this content of the odor of durian pulp so as to provide a practical method to evaluate durian odor.