The determination of fat content is commonly used in food fats and oils and other industries. The determination of fat content using a crude fat measuring instrument is now the main method. The measurement results are also very accurate and reliable. The crude fat analyzer uses Soxhlet extraction, which dissolves the fat out of the sample with ether or other organic solvents, and then dries it, weighs it, and finally obtains the fat content. Through Soxhlet extraction, dissolved substances are not only fats, but also other substances such as chlorophyll, carotene, and organic acids, so the fat extraction apparatus is sometimes called a crude fat analyzer.
The crude fat analyzer Soxhlet extraction is the most classic method for determining fat content. With the advancement of instrument technology, Soxhlet extraction has greatly improved the sampling efficiency. Let's analyze the precautions when using the fat fat analyzer to sample samples:
1. First, before the dissolution, the sample is ground. The degree of grinding can directly affect the speed of extraction of fat. Grinding can fully dissolve the fat in petroleum ether, ether and other organic solvents.
2. When the sample is ground, put the sample into the filter paper tube. At this time, the filter paper tube must be tight, and the height of the filter paper tube cannot exceed the return bend, otherwise the solvent will not easily penetrate the sample.
3. When extracting, ether is used as a fat solvent. The boiling point of ethyl ether is about 40°C. Therefore, the temperature should not be too high, about 70-85°C.
4. The reagents used in the experiment must be anhydrous reagents. For example, if ether is used in the experiment, the ether must be made of anhydrous ethyl ether, because if it contains other substances, such as water, the sugar or inorganic substances in the sample may be used. Extracts affect fat measurement results. Therefore, it is also necessary to ensure that the solvent cups and other items used in the experiment are dry.
5. It is best to connect a calcium chloride drying tube to the upper end of the condensing tube. This not only prevents moisture from entering the air, but also prevents ether from escaping in the air. This prevents the contamination of laboratory micro-ambient air. If there is no such device, a stick of dry absorbent cotton balls may also be added. A fully automatic or semi-automatic machine will have a lid at the top of the condenser tube. This will also provide a good protection experiment and avoid solvent evaporation.
6. With the crude fat extractor fully extracted, the sample and ether extract can be dried or the solvent cup can be dried. The drying time should not be too long, because some unsaturated fatty acids are easily oxidized during heating and affect the final result of fat determination. In the absence of vacuum drying oven, it can be dried at 100-105°C for 1.5-3 hours.
The crude fat analyzer Soxhlet extraction is the most classic method for determining fat content. With the advancement of instrument technology, Soxhlet extraction has greatly improved the sampling efficiency. Let's analyze the precautions when using the fat fat analyzer to sample samples:
1. First, before the dissolution, the sample is ground. The degree of grinding can directly affect the speed of extraction of fat. Grinding can fully dissolve the fat in petroleum ether, ether and other organic solvents.
2. When the sample is ground, put the sample into the filter paper tube. At this time, the filter paper tube must be tight, and the height of the filter paper tube cannot exceed the return bend, otherwise the solvent will not easily penetrate the sample.
3. When extracting, ether is used as a fat solvent. The boiling point of ethyl ether is about 40°C. Therefore, the temperature should not be too high, about 70-85°C.
4. The reagents used in the experiment must be anhydrous reagents. For example, if ether is used in the experiment, the ether must be made of anhydrous ethyl ether, because if it contains other substances, such as water, the sugar or inorganic substances in the sample may be used. Extracts affect fat measurement results. Therefore, it is also necessary to ensure that the solvent cups and other items used in the experiment are dry.
5. It is best to connect a calcium chloride drying tube to the upper end of the condensing tube. This not only prevents moisture from entering the air, but also prevents ether from escaping in the air. This prevents the contamination of laboratory micro-ambient air. If there is no such device, a stick of dry absorbent cotton balls may also be added. A fully automatic or semi-automatic machine will have a lid at the top of the condenser tube. This will also provide a good protection experiment and avoid solvent evaporation.
6. With the crude fat extractor fully extracted, the sample and ether extract can be dried or the solvent cup can be dried. The drying time should not be too long, because some unsaturated fatty acids are easily oxidized during heating and affect the final result of fat determination. In the absence of vacuum drying oven, it can be dried at 100-105°C for 1.5-3 hours.
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