Tobacco flavors and fragrances are mainly divided into adding flavor and adding flavor, that is, material flavor and surface flavor. The flavor is usually composed of carbohydrates and organic acids, which are used to regulate the pH and taste of tobacco leaves. The epiaroma is composed of natural or synthetic flavors and spices, which have a strong fragrance, which can improve the taste and aroma of tobacco and make the smoke taste more intense and rich. According to different tobacco types and characteristics, the flavors and fragrances used in tobacco are also different. For the tobacco industry, flavors and fragrances are one of the important factors to improve the quality of cigarettes and meet consumer demand. In tobacco processing, flavors and fragrances are usually added during the cigarette making process to make the tobacco of better quality. The preparation process of tobacco flavors and fragrances usually includes steps such as material selection, formula design, processing and blending. In the preparation process, it is necessary to take into account the quality of raw materials, the scientificity of the formula and the production process conditions and other factors to ensure the quality and stability of tobacco flavors and fragrances. In addition, the safety of flavors and fragrances for cigarettes is also an issue that needs attention. When choosing raw materials, natural raw materials should be preferred and the use of chemicals that are harmful to the human body should be avoided. At the same time, effective quality control measures are also required during the preparation process to ensure the safety and stability of the product. Tobacco flavors and fragrances are an important part of the tobacco industry, and their quality and preparation process have a crucial impact on the quality and taste of tobacco.
The testing standards for tobacco flavors and fragrances mainly include the following:
1.Appearance: Flavors and fragrances should be free of impurities, precipitation, and uneven color.
2.Aroma quality: Flavors and fragrances should have an aroma consistent with their labels, and there should be no peculiar smell or odor.
3.Flavor quality: Flavors and fragrances should have a taste consistent with their labels, and should not have too much irritation, bitterness and other bad tastes.
4.Heavy metals (in Pb): Flavors and fragrances must not contain excessive amounts of heavy metals, such as lead.
5.Arsenic (as AS): Flavors and fragrances must not contain excessive amounts of arsenic.
6.Refractive index (n): The refractive index of flavors and fragrances should be within the range of their identification.
7.Relative density (d): The relative density of flavors and fragrances should be within the range of their labeling.
8.Acid number (a.)v.): The acid value of flavors and fragrances should be within the range of their labeling.
9.Total volatile components: The total amount of volatile components in flavors and fragrances should be within the scope of their labeling.
10.Other physical and chemical indicators: According to different flavors and fragrances, there may be other specific physical and chemical indicators that need to be tested, such as solubility, freezing point, etc.
Near-infrared spectroscopy (NIRS) can be used for rapid detection and quality control of tobacco flavors and fragrances. Near-infrared spectroscopy is a fast, non-destructive, and efficient detection method, which can analyze the components and content of substances by measuring the absorption characteristics of near-infrared light. In the detection of tobacco flavors and fragrances, the near-infrared spectroscopy analyzer can be used for the detection of the following aspects:
1.Ingredient analysis: The near-infrared spectrometer can quickly detect the main components in tobacco flavors and fragrances, including aroma components, additives, solvents, etc. By establishing a near-infrared spectral database of standard samples, the spectral data of unknown samples can be quickly compared, so as to determine the main components and contents of unknown samples.
2.Quality control: NIR spectroscopy analyzer can be used for quality control of tobacco flavors and fragrances, including the detection of product stability, uniformity and consistency. By regularly testing the near-infrared spectral data of the product, the problems existing in the product can be found in time, such as uneven components, deterioration, etc., so as to take corresponding measures to control and deal with them.
3.Production monitoring: Near-infrared spectroscopy analyzer can be used in the production process of tobacco flavors and fragrances to monitor all aspects of the production process in real time. Through real-time detection of near-infrared spectral data of products, abnormalities in the production process, such as equipment failures, raw material problems, etc., can be found in time, so as to take corresponding measures to adjust and deal with them to ensure the stability of production and product quality.
Tobacco flavor is mainly used to enhance the smell and flavor of cigarettes, and is the core technology of cigarette industry enterprises. As one of the most abundant components in tobacco flavors, the stability of solvents is closely related to the quality of tobacco flavors, and can be used as one of the important indicators to determine whether the flavor is qualified and the stability of the product. Therefore, the quality of tobacco flavor is closely related, and can be used as one of the important indicators to judge whether the flavor is qualified and the product is stable. Therefore, it is important to use solvents (water, ethanol, 12-propylene glycol, glycerol, etc.) content is of great significance. In recent years, research on the determination of solvent content in tobacco flavors has been reported, but gas chromatography is mostly used, which is limited by factors such as sample preparation, testing time and conditions, and the quality control of flavors in the production process of cigarettes will have certain limitations. With the increasing number of product grades and specifications of cigarette manufacturers, the efficiency of flavor use is improved, and fast and accurate quality control methods are very important. At present, there have been studies on the analysis of physical and chemical indexes of solvents used in tobacco flavors and fragrances by near-infrared spectroscopy. Qin Zixian, He Chunli et al. used near-infrared spectroscopy to establish a model of water, ethanol, 1,2-propanediol and glycerol in four components of tobacco flavor, and verified and evaluated the model. The results show that the proposed model can quickly perform the content of water, ethanol, 1,2-propanediol and glycerol in the samples at the same time, and the correlation coefficients (R2) of the correction set of the model are all greater than 0985, and the root mean square error (rmsec) of correction is . 849。There was no significant difference between the ** value of the model and the GC-TCD method, and there was no significant difference between the two results (P>0.).05), the quality control model was established by using the ** value, and the correct discrimination rate of the model for abnormal samples and normal samples was 100% when the significant level was 5%. It can be seen that near-infrared spectroscopy technology can perform non-destructive, fast and efficient simultaneous analysis of commonly used solvents for tobacco flavors, and can be used for quality monitoring in the production and application of tobacco flavors.