Qualitative Detection of Bottled Vinegar Based on NIR Spectroscopy Technique
SONG Hai-yan1, QIN Gang2*, LIU Hai-qin1
1. College of Engineering, Shanxi Agricultural University, Taigu 030801, China 2. College of Forestry, Shanxi Agricultural University, Taigu 030801, China
Abstract：To evaluate the applicability of non-invasive near infrared reflectance (NIR) spectroscopy for detection of bottled vinegar, transmission spectra of bottled vinegar samples were obtained and compared with the spectra obtained by using cell detection method, where samples were titrated in the fixed liquid cell with a 1.0 mm light path length. The result shows that, the spectra obtained by the two different methods have obvious differences in the near infrared region. Firstly, the spectra obtained by using bottled detection method have no absorption peak at 1 480 and 1 900 nm, and furthermore, it has absorption peak at 1 660 nm. Secondly, the max. absorbance value of bottled detection is less than 4, while with the cell detection it is near 6. It indicates that glass packaging has influence on the detection of bottled vinegar. The 1st derivative method was put forward to eliminate this influence, and then qualitative analysis model was obtained by using principal component analysis-artificial neural net work. The precision of prediction result achieved 100%. This research shows that 1st derivative can eliminate the influence of glass packaging, and realize the qualitative analysis of bottled vinegar.
[1] YAN Yan-lu, ZHAO Long-lian, HAN Dong-hai, et al(严衍禄，赵龙莲，韩东海，等). The Foundation and Application of the Near Infra-red Spectroscopy Analysis(近红外光谱分析基础与应用). Beijing: China Light Industry Press(中国轻工业出版社), 2005. [2] Yu H Y, Ying Y B, Sun T, et al. Journal of Food Science, 2007, 72(3): 125. [3] Yu H Y, Niu X Y,Lin H J, et al. Food Chemistry, 2009, 113(1): 291. [4] Nordon A, Mills A, Burn R T, et al. Analytica Chimica Acta, 2005, 548(1-2): 148. [5] Cozzolino D, Kwiatkowski M J, Waters E J, et al. Anal. Bioanal. Chem., 2007, 387: 2289. [6] Skouroumounis G K, Kwiatkowski M J, Sefton M A, et al. Aust. J. Grape Wine Res., 2003, 9(2): 138. [7] SONG Hai-yan, QIN Gang, LU Hui-shan, et al(宋海燕，秦 刚，陆辉山，等). Journal of Chinese Institute of Food Science and Technology(中国食品学报)，2010，10(4)：267. [8] Liu F, He Y. Food Chemistry, 2009, 115(4): 1430. [9] Liu F, Yong H, Wang L. Analytica Chimica Acta, 2008, 615(1): 10. [10] Liu F, He Y, Wang L. Analytica Chimica Acta, 2008, 610(2): 196. [11] CHEN Bin, HUANG Chuan-xu, LI Guo-quan, et al(陈 斌，黄传旭，李国权，等). Transactions of the Chinese Society of Agricultural Machinery(农业机械学报)，2005，36(5)：65. [12] TIAN Ying-liang, SUN Shi-bing(田英良, 孙诗兵). New Glass Technology(新编玻璃工艺学). Beijing: China Light Industry Press(北京：中国轻工业出版社), 2009. [13] CHU Xiao-li, YUAN Hong-fu, LU Wan-zhen(褚小立，袁洪福，陆婉珍). Progress in Chemistry(化学进展)，2004，16(4)：528.
