Abstract：In this research, near infrared spectroscopy was used to detect adulterated percent of camellia oil adulterated with soybean oil quantificationally at different optical lengths, and the effect of optical length on detection accuracy of adulterated percent was investigated. Soybean oil was put into camellia oil according to different mass fraction, the adulterated mass fraction was ranged from 1% to 50%. Transmission spectra of samples were acquired by a Quality Specspectrometer at different optical lengths (1, 2, 4, 10 mm), and effect of optical length on detection accuracy of adulterated percent was analyzed by comparing quantitative prediction models that developed at different calibration methods, pretreatment methods and wavelength range. The results indicate that the performance of quantitative prediction model of adulterated percent is improved as the optical length is increasing from 1 to 4 mm, while the performance of quantitative prediction model of adulterated percent is deteriorated as the optical length is increasing from 4 to 10 mm. 4 mm is a better optical length for camellia oil adulteration. The coefficients of determination of prediction (R2P) and root mean square error of prediction (RMSEP) in quantitative prediction models of adulterated percent for optical lengths of 1, 2, 4, 10 mm are 0.923, 0.977, 0.989, 0.962 and 4.58%, 2.54%, 1.72%, 3.20%, respectively.
[1] LU Wan-zhen(陆婉珍). Modern Near Infrared Spectroscopy Analytical Technology(现代近红外光谱分析技术). Beijing: China Petrochemical Press(北京: 中国石化出版社), 2007. [2] Cen H, He Y. Trends in Food Science & Technology, 2007, 18(2): 72. [3] Wu D, Chen X J, Zhu X G, et al. Analytical Methods, 2011, 3(8), 1790. [4] Dos Santos C A T, Lopo M, Pascoa R N M J, et al. Applied Spectroscopy, 2013, 67(11): 1215. [5] Wu D, He Y, Nie P C, et al. Analytica Chimica Acta, 2010, 659(1-2): 229. [6] Cheng J H, Dai Q, Sun D W, et al. Trends in Food Science & Technology, 2013, 34(1): 18. [7] ZHAO Jie-wen, GUO Zhi-ming, CHEN Quan-sheng, et al(赵杰文, 郭志明, 陈全胜, 等). Acta Optica Sinica(光学学报), 2008, 28(12): 2302. [8] Yang H, Irudayaraj J. Journal of the American Oil Chemistry Society, 2001, 78(9): 889. [9] Ozdemir D, Ozturk B. Journal of Food and Drug Analysis, 2007, 15(1): 40. [10] Christy A A, Kasemsumran S, Du Y, et al. Analytical Sciences, 2004, 20(6): 935. [11] Ozturk B, Yalcin A, Ozdemir D. Journal of Near Infrared Spectroscopy, 2010, 18(3): 191. [12] WANG Chuan-xian, CHU Qing-hua, NI Xin-lu, et al(王传现, 褚庆华, 倪昕路，等). Food Science (食品科学), 2010, 31(24): 402. [13] ZHANG Ju-hua，ZHU Xiang-rong，SHANG Xue-bo, et al(张菊华, 朱向荣, 尚雪波, 等). Science and Technology of Food Industry(食品工业科技), 2012, 33(3): 334. [14] Wang L, Lee F S C, Wang X, et al. Food Chemistry, 2006, 95: 529. [15] SUN Tong, HU Tian, XU Wen-li, et al(孙 通, 胡 田, 许文丽, 等). China Oils and Fats(中国油脂), 2013, 38(10): 75.
