Application of colorimeter in wine quality detection

Nowadays, life and health care are more and more popular. Compared with beer, Baijiu and foreign wine, wine, which is often referred to as red wine, is more popular among consumers. Red wine not only tastes sweet and tastes good, but also looks beautiful and is popular with female consumers. So how to judge the quality of wine? Is it very accurate to use visual, olfactory and tasting methods, which are influenced by many factors. The modern wine production industry uses colorimeter to measure the color and luster of wine. By analyzing these data, a relatively perfect detection scheme is determined.

In the process of wine production, color evaluation is an important indicator of its appearance quality. The degree of oxidation and quality of a bottle of wine can be judged according to the chromaticity and hue of wine. The degree of chromaticity of wine is mainly determined by the phenolic substances in wine, such as anthocyanin and tannin. If the content of anthocyanin and tannin is high, the color of wine will be deep, and the chromaticity value will be on the contrary, relatively low. However, the various properties of the pigment are also affected by the PH of the wine liquor and some reagents (such as acidic sodium sulfite), so that the color of the wine changes.

These data can be quickly measured by using the Sanenz spectrophotometer. The chromaticity value measured by the colorimeter can be seen as the PH value increases, so does the chromaticity value. In addition, this method can be used to determine wine in a limited amount

The content of raw juice is obvious, intuitive, accurate and reliable. The colorimetric determination method of red wine was studied with a colorimeter. The color of red wine was determined by colorimeter and its sensory analysis was carried out. It was found that there was a certain linear relationship between L * value (brightness variable), a * value (redness variable) and the content of anthocyanin and tannin in red wine.

Detection of tobacco leaf color by colorimeter:
The colorimeter is mainly a precision optical instrument used to detect the color of products. In the tobacco industry, the quality and grade of tobacco are also judged by the gloss and color of tobacco. Tobacco grading is also an important part of industrial and commercial handover. The current national standard for flue-cured tobacco in China stipulates that flue-cured tobacco should be classified first and then. The color of tobacco leaves refers to the state of the relevant color, color saturation and color value of the tobacco leaves of the same type after modulation, so the identification of color is directly related to the rationality of grading.

For a long time, the evaluation of tobacco leaves at home and abroad is based on visual sensory evaluation. However, because no one has different recognition of color, the color of tobacco leaves identified by this method has great error due to the influence of environment, emotion and visual sensitivity. There is no quantitative standard for the color and characteristic description of tobacco leaves in the 42nd grade national flue-cured tobacco grading standard implemented in China, which also greatly affects the efficiency of tobacco quality grading.

Based on the above situation, the instrument detection of tobacco leaf color has become a new need and necessary method, and the use of color difference instrument to measure tobacco leaf. The colorimeter uses photoelectric integrating elements with specific spectral sensitivity to calculate color difference information and color difference value using CIE Lab, an international universal colorimetric space.

This method not only improves efficiency scientifically and rapidly, but also gives information that is very accurate, clear and easy to analyze. Using CIELAB color space, the application of color difference meter in color detection of tobacco grading was discussed. Thus, tobacco grading will develop from traditional manual to instrumental, from qualitative to quantitative, from empirical to theoretical.

According to the standard samples formulated by the grading of flue-cured tobacco in GB2635-1992, the upper lemon yellow (BL), upper orange yellow (BF) and upper red brown (BR) tobacco leaves were selected as the research objects, namely, the upper lemon yellow has four grades of B1L, B2L, B3L and B4L, the upper orange has four grades of B1L, B2L, B3L and B4L, and the upper red brown has three grades of B1L, B2L and B3L, a total of 11 grades

In each grade of sample, select 20 representative tobacco leaves (the leaf surface is required to be flat), put them in a constant temperature and humidity box, set the ambient relative humidity of 65%, the temperature of (22 ± 2) ℃, and the equilibrium time is not less than 24 hours; Use the NH310 colorimeter to select a large diameter of 8mm for color measurement.

Under the condition of 8/d (8 ° illumination/diffuse light), first correct the instrument in black and white, and then take points at the leaf tip, leaf and leaf base of each tobacco leaf for measurement; When measuring, place the tobacco leaf flat on the experimental platform, face up to make it naturally flat.

When taking points, select 3 points evenly at the corresponding positions on both sides of the bisection of the main vein (the middle point between the main vein and the leaf edge, try to avoid the disease spot), and 6 points for each tobacco leaf. The measured colorimetric indexes mainly include L * value (lightness value), a * value (red-green value, positive value represents red degree, negative value represents green degree), b * value (yellow-blue color value, positive value represents yellow degree, negative value represents blue degree), C * value (saturation), h * value (hue angle) and Δ E value (total color difference).

The colorimeter is not only fast and clear in detecting the color level of tobacco leaves, but also can be said to be the product of the rapid development of science and technology. In this era of information and digitalization, the traditional visual estimation method can not meet the requirements of color quality in more aspects. Therefore, the development of colorimeter in all walks of life is an inevitable trend.

Application of colorimeter in quality detection of vegetable oil:
Vegetable oil is one of the indispensable condiments in our current life. People in modern life have higher and higher requirements for quality of life. The safety and nutritional value of food is one of the most concerned issues for consumers. Many chemicals designed in the traditional way of detecting plants have a great impact on the food itself, and the measurement results are not necessarily accurate, so now scientific manufacturers start to use colorimeter, a new precision instrument for detection.

At present, there are many indicators for testing vegetable oil, such as acid value, iodine value, peroxide value, etc. However, because the chemical method is more troublesome and requires a large amount of organic solvents, it not only increases the detection cost, but also causes harm to the detector. Therefore, oil color and lustre become one of the basis of oil quality evaluation.

Vegetable oils have different colors, mainly because the oil seeds contain carotenoids, flavonoid pigments, chlorophyll, gossypol and other pigment substances, which are soluble in oils during the process of oil production. The color of oil is not only related to the color of oil seeds, but also related to processing technology and refining process.

In addition, the deterioration of oil quality and rancidity of oil will also lead to the darkening of oil color. Therefore, measuring the color of oil can understand the purity, processing technology and refining degree of oil, and can also judge whether it is deteriorated. In the national standard of vegetable oil in China, the Lovibond colorimeter method is often used to determine the color, and the corresponding indicators are formulated. However, visual comparison of oil color requires skilled experience and high quality, and the appearance of colorimeter has replaced this visual colorimetry due to the influence of environmental factors.

The relationship between color parameters and chemical indexes of heated peanut oil was studied. The results showed that the acid value and iodine value were linear with heating time and color parameters, respectively; The peroxide value increases sharply at first and then decreases slowly with the increase of heating time, which is not linear with the color parameters L *, a * and b *.

The colorimeter is not only fast, accurate and safe in measuring the color of vegetable oil, but also clear in analysis. Most color difference meters in the market now provide upper computer software that can directly connect the color difference meter with the computer, establish a color database, and provide the greatest convenience for color measurement and rating of future products.

LISUN lauched Portable Colorimeter/Chroma Meter is an innovation color measuring tool with powerful configuration to make color measurement easier and more professional; It support Bluetooth to connect with Android and ISO devices, Portable Colorimeter/Chroma Meter will take you into a new world of color management; It can be widely used to measure color value, color difference value and find similar color from color cards for printing industry, paint industry, textile industry, etc.

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

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