Use of ATR-FTIR spectroscopy coupled with chemometrics for the authentication of avocado oil in ternary mixtures with sunflower and soybean oils

作者：Jimenez Sotelo Paola; Hernandez Martinez Maylet; Osorio Revilla Guillermo; Gabriela Meza Marquez Ofelia; Garcia Ochoa Felipe; Gallardo Velazquez Tzayhri^*

来源：Food Additives and Contaminants Part A-Chemistry Analysis Control Exposure& Risk Assessment, 2016, 33(7): 1105-1115.

DOI：10.1080/19440049.2016.1203073

• Avocado oil
• ternary mixture
• adulteration
• mid-FTIR
• SIMCA
• chemometrics

Avocado oil is a high-value and nutraceutical oil whose authentication is very important since the addition of low-cost oils could lower its beneficial properties. Mid-FTIR spectroscopy combined with chemometrics was used to detect and quantify adulteration of avocado oil with sunflower and soybean oils in a ternary mixture. Thirty-seven laboratory-prepared adulterated samples and 20 pure avocado oil samples were evaluated. The adulterated oil amount ranged from 2% to 50% (w/w) in avocado oil. A soft independent modelling class analogy (SIMCA) model was developed to discriminate between pure and adulterated samples. The model showed recognition and rejection rate of 100% and proper classification in external validation. A partial least square (PLS) algorithm was used to estimate the percentage of adulteration. The PLS model showed values of R-2 > 0.9961, standard errors of calibration (SEC) in the range of 0.3963-0.7881, standard errors of prediction (SEP estimated) between 0.6483 and 0.9707, and good prediction performances in external validation. The results showed that mid-FTIR spectroscopy could be an accurate and reliable technique for qualitative and quantitative analysis of avocado oil in ternary mixtures.

• 出版日期2016-7