I. Introduction. Baijiu, as a traditional Chinese drink, carries rich cultural connotations and unique taste charm. In the production and tasting process of liquor, the gas chromatograph has become an indispensable tool. This article will introduce the use of domestic liquor gas chromatograph in detail to help readers better grasp this technology and improve the level of liquor tasting.
2. Introduction to domestic liquor gas chromatograph.
The domestic liquor gas chromatograph is a high-end instrument specially used for the analysis of liquor components. Through gas chromatography technology, it can quickly and accurately detect various chemical components in liquor, such as esters, alcohols, aldehydes, etc., which provides strong support for the quality control and tasting of liquor.
3. How to use.
Sample preparation. First of all, you need to prepare a sample of the liquor to be tested. Ensure that the sample bottle is clean and free of contamination, accurately weigh the appropriate amount of liquor sample, inject it into the sample bottle, and seal it for storage.
Instrument start-up and pre-heating.
According to the requirements of the instrument manual, turn on the gas chromatograph and perform the necessary preheating. The warm-up time varies depending on the instrument model and manufacturer's requirements, but typically takes 30 minutes to 1 hour.
Parameter settings. According to the needs of liquor composition analysis, set appropriate chromatographic conditions, including injection method, carrier gas type, flow rate, column temperature, detector temperature, etc. The setting of these parameters is critical to the accuracy of the analysis results.
Injection analysis. The prepared liquor sample is injected through the injection needle into the injection port to start the injection analysis. Observe the changes in the chromatogram and record data such as peak shape, peak height, and peak area.
Data processing. The analyzed data is sorted out and processed, and chromatograms are drawn through professional software, and the content and proportion of different components are compared and analyzed, so as to evaluate the quality and flavor characteristics of baijiu.
Instrument shutdown and maintenance.
After the analysis, turn off the gas chromatograph according to the requirements of the instrument manual, and carry out the necessary cleaning and maintenance work to ensure the normal operation of the instrument and prolong the service life.
Fourth, the use of skills and precautions.
Sample selection. When selecting liquor samples, it should be ensured that the samples are representative and can truly reflect the quality and flavor characteristics of baijiu. At the same time, avoid selecting expired or deteriorated samples, which can affect the accuracy of the analytical results.
Parameter optimization. When setting chromatographic conditions, parameters should be optimized according to the specific composition and analytical needs of the liquor. Different liquor types and brands may require different chromatographic conditions for optimal analysis.
Instrument calibration and maintenance.
Regular calibration and maintenance of the gas chromatograph is an important measure to ensure the accuracy of the analytical results. Calibration and maintenance should be carried out in accordance with the manufacturer's requirements, and relevant data and operations should be recorded.
Data analysis and interpretation.
When analyzing the obtained chromatograms and data, they should be interpreted in combination with the professional knowledge and tasting experience of baijiu. By comparing and analyzing the content and proportion of different ingredients, the quality and flavor characteristics of baijiu can be more accurately evaluated.
V. Conclusion. As an important tool for liquor tasters, the domestic liquor gas chromatograph is of great significance for improving the level of liquor tasting and quality control. Through the introduction of this article, I believe that readers have a deeper understanding of the use of domestic liquor gas chromatographs. In practical application, continuous learning and exploration, combined with professional knowledge and practical experience, will surely make this artifact play a greater value.