A method for rapid detection of milk fat content based on dielectric spectroscopy

Abstract

The invention discloses a method for quickly detecting the fat content of bovine milk based on a dielectric spectrum technique. According to the method for quickly detecting the fat content of the bovine milk based on the dielectric spectrum technique, dielectric spectrums (relative dielectric constant spectrums and dielectric loss factor spectrums), in certain one radio-frequency / microwave range of one batch of bovine milk samples are obtained by utilizing a network analyzer (or an impedance analyzer) and a coaxial probe; characteristic dielectric variables which express the fat content of the bovine mink are extracted from the dielectric spectrums; linear or nonlinear detection models for detecting the fat content of the bovine milk are established based on the dielectric spectrums in the whole radio-frequency / microwave range or the extracted characteristic dielectric variables; the models are inspected; the model of which the prediction-set root-mean-square error is minimal is used as an optimal model for detecting the fat content of the bovine milk. The dielectric spectrum of a bovine milk sample of which the fat content is unknown is measured; the numerical values of the characteristic dielectric variables are substituted into the optimal model, so that the fat content of the sample can be calculated. The method for quickly detecting the fat content of the bovine milk based on the dielectric spectrum technique has the advantages that the detection is convenient and quick, the operation is simple, the precision is high, and the on-line and real-time detection can be realized.

Description

technical field [0001] The invention belongs to the technical field of dielectric spectrum measurement, in particular to a method for rapidly detecting milk fat content based on dielectric spectrum technology. Background technique [0002] Milk is a food rich in nutrition, reasonable in composition and easy to digest and absorb. Because it contains a variety of nutrients needed by the human body, it is known as the "king of food". The fat in milk is a high-quality natural fat, which is not only an important nutrient carrier in milk, but also plays a key role in the taste and flavor of milk. Since the fat content in milk is affected by conditions such as individual cows, seasons, diet, lactation period, etc., the fat content in milk is a variable amount. The fat content has a great influence on the quality of milk and milk processed products (such as cheese). Therefore, the detection of milk fat content is a routine detection item. At this stage, the methods commonly used ...

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Problems solved by technology

However, the existing research only focuses on the analysis of the influence of fat content changes on the dielectric spectrum or dielectric characteristic parameters for a single milk sample, or macroscopically compares the dielectric characteristic parameters of whole milk, semi-skimmed milk and whole skimmed milk.

However, the fat content of milk is affected by many factors, and its variation is relatively large. At present, there is no research literature on the detection of fat content of large samples of milk based on dielectric spectrum technology.

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