A method for predicting the type and content of other adulterated oils in camellia oil

Abstract

The invention provides a method of predicting types and contents of other adulterated oil in tea oil. The method includes the following steps: 1) collecting tea oil, maize oil, sunflower seed oil, and rapeseed oil in different types and brands, and doping the maize oil, sunflower seed oil and rapeseed oil with the tea oil at different ratio, and performing 1H NMR detection to obtain corresponding spectrums, and determining an optimum pretreatment method through a PCA score chart; and 2) further establishing qualitative and quantitative models through orthogonal partial least squares-determination analysis (OPLS-DA) and partial least squares (PLS), verifying the models, and finally identifying the models with a prediction set, when the adulteration quantity of the maize oil, sunflower seed oil and rapeseed oil is more than 5%, determination accuracy is higher than 97%. By means of the NMR data with the partial least squares, the volume fraction of adulterated oil can be quantitatively detected. The method is simple in operation and reliable in technology, and can quickly determine the types and quantities of the adulterated oil in tea oil.

Description

technical field The invention relates to the technical field of chemical analysis, and further relates to the application of nuclear magnetic resonance technology and chemometrics in the analysis of food components, in particular to a method for predicting the types and contents of other adulterated oils in camellia oil. Background technique Camellia oil, also known as camellia oil or camellia seed oil, is a pure natural high-grade edible vegetable oil extracted from the mature seeds of common camellia oleifera (Camellia oleifera Abel) in the family Theaceae. It is golden or light yellow in color, pure in quality, clear and transparent, and fragrant in smell , pure taste. Camellia oil is one of the four major woody vegetable oils in the world. The oil content of camellia oleifera seeds is generally 25-35%. The extracted camellia oleifera seed oil mainly contains unsaturated fatty acids such as oleic acid and linoleic acid. Similar, even some nutritional indicators are highe...

AI Technical Summary

Problems solved by technology

The present invention aims to provide a method for predicting the types and contents of other adulterated oils in camellia oil aiming at the technical defects of the prior art, so as to solve the problem in the prior art that the qualitative and quantitative detection accuracy of other adulterated oils in camellia oil is relatively low. low technical issues

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