SuperNose electronic nose in the field of edible oil

Odor is an important indicator for evaluating food quality. The change of food odor is often closely related to the change of its quality. By analyzing the odor of food, the quality of food can be detected and controlled. Since there is no uniform standard for the evaluation of odor, the experimental design of human assessment is more complicated, and the obtained data subjective factors are strong, the repeatability is poor, and the reliability and credibility are low. In order to improve the objectivity, reliability and repeatability of the sensory evaluation of food, and to reduce the difference in human assessment, the electronic nose is used to evaluate the odor of food.

Edible oil, also known as "edible oil," refers to animal or vegetable oils used in the production of food. It is liquid at normal temperature. Due to the source of raw materials, processing technology and quality, the common edible oils are mostly vegetable oils, including corn oil, rapeseed oil, peanut oil, sesame oil, corn oil, olive oil, camellia oil, palm oil, canola oil, sunflower seeds. Oil, soybean oil, sesame oil, linseed oil (spoma oil), grape seed oil, walnut oil, peony seed oil, and the like. Because of its good thermal conductivity, edible oil is widely used in food frying, and it can also improve the color of dishes and supplement the nutrients needed by the human body, which is vital to human health. The country has set new national standards for edible vegetable oils such as cottonseed oil, sunflower oil, camellia seed oil, corn oil, rice bran oil, soybean oil and peanut oil. The current market still has the advent of adulterated oil and waste oil. Odor is an important indicator of the quality of edible oils. Different types of edible oils can be distinguished according to the evaluation of odors. And the odor can also reflect the change in the quality of the edible oil during the production and storage process. For example, when the edible oil is rancid, there is a scent of scent. Therefore, the scientific determination of the smell of edible oil is very important for the development of the edible oil industry.

The detection of the electronic nose is mainly directed to volatile flavor substances. When one or more flavor substances pass through the electronic nose, the "smell fingerprint" of the flavor material can be sensed by the sensor and extracted by a special intelligent pattern recognition algorithm. Different "odor fingerprints" information of different flavor substances can be used to distinguish and identify different gas samples. In addition, certain flavor substances can justify the comprehensive quality information of the sample under different multi-variable effects such as different raw material origin, different harvest time, different processing conditions and different storage environments. The electronic nose is made up of the most advanced sensors. It is the electronic nose with the best stability and the highest detection accuracy. Ideal for testing liquid and solid samples containing volatile materials.

The idea of ​​electronic nose design is derived from the mechanism of biological perception of smell. The sensor array in the electronic nose system is equivalent to the nose in the biological system, feels different flavor substances, collects various kinds of signal information and inputs it into the computer, and the computer replaces the brain function in the biological system, and analyzes and processes through software. The flavor substances are distinguished and identified, and finally the sensory information of each substance is given. Each individual sensor in the sensor array is like the olfactory cells in the nasal cavity. It has an interactive sensitivity. That is, an independent sensor does not only feel a flavor, but feels a kind of flavor and feels a certain kind of flavor. At the same time as the substance, it also feels another part of other flavor substances.

The traditional gas sensor design ideas often use a specific sensor to sense a specific substance, such as an ethanol sensor, a carbon dioxide sensor, etc., and have exerted good application effects in certain specific fields. However, when detecting complex and non-uniform systems such as foods, systems composed of a single sensor often fail to reflect the overall characteristic information of the sample to be tested because of the intertwined and diverse species of flavor components. In particular, the amount of superimposed information of a plurality of flavor substances requires a detection system constructed by means of an interactive sensitive multi-sensor array, which we call an electronic nose system. The electronic nose gas sensor injection mode is as follows.

Gas sampling device

The gas sampling device mainly includes a micro vacuum pump, a gas chamber, a flow meter, a solenoid valve, a throttle valve, a filter, an air purifying device, and the like. The vacuum pump is primarily responsible for delivering gas to the chamber containing the sensor. The solenoid valve is used to switch between the sampling pump and the cleaning pump to prevent gas backflow. The throttle valve can be used to control the flow of gas, and the flow meter can intuitively characterize the velocity of the gas stream. The filter prevents dust from the gas from affecting the operation of the vacuum pump. The air purification device can further purify and purify the atmosphere of the environment for cleaning, calibration and calibration of the system.

The fully automatic electronic nose (SuperNose) agent of Shanghai Ruiyi International Trade Co., Ltd. mainly uses volatile flavor substances as the detection object. When one or more flavor substances pass through the automatic electronic nose, the "smell fingerprint" of the flavor substance. It can be sensed by the sensor and extracted by a special intelligent pattern recognition algorithm. Different "odor fingerprints" information of different flavor substances can be used to distinguish and identify different gas samples. The automatic electronic nose has an automatic sample introduction device (36-bit), which can simultaneously measure multiple sets of samples, which brings convenience to the operator and also makes up for the shortcomings of data instability. It has the advantages of simpler operation, faster data analysis and more stable results . It is very suitable for detecting liquid and solid samples containing volatile substances.

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