The Kjeldahl method is currently the most commonly used method for protein determination. This method determines the total protein content by determining the total organic nitrogen content. It can be used for the determination of protein content in various crops and foods. It is widely used at home and abroad. . In order to improve work efficiency and accuracy, the application of digester is essential. Twenty sample tubes can be digested at a time. Kjeldahl is automatically and continuously diluted with water, added with alkali, added with acid, distilled, titrated, and the emptying of digestive tubes and results calculated quickly and accurately. Therefore, the Kjeldahl nitrogen analyzer has great advantages and application prospects in the determination of crude protein content in fields such as agriculture, food, chemical engineering, medicine and health.
Select a representative seed to pick clean and shell, sample and grind, pass 0.42mm sieve. Weigh 0.5g sample 2 copies, accurate to 0.0001g, according to the national standard GB5497-1985 determine the moisture content of the sample. Open the digester and preheat it so that the temperature reaches 420 °C for digestion. Place the test crop sample in a 250-mL digestive canal (be careful not to adhere to the wall to prevent incomplete digestion). Except for soybean crop plus 1 g sample, all other crops are 0.5-1.0 g. After adding the digestion tablets 5g, then add 12 ~ 15mL concentrated sulfuric acid, gently shaking the digestive tube, the sample was wet with sulfuric acid. The digestion tube was placed on a digester preheated to 420°C and the suction pump was turned on to a maximum. After 5 minutes, a small suction pump was turned off until the acid mist just filled the exhaust hood and a condensation ring was formed in the test tube. About 90 min sample digestion to a clear blue-green liquid, remove and cool to room temperature. Put the digestive tube into the FOSS8400 automatic Kjeldahl nitrogen analyzer, close the safety gate, set the list, and start the sample loading after registration. The instrument performs automatic distillation, titration, result calculation, and cleaning. Instead of using 0.1g of sucrose as a blank sample, the volume of the spent acid standard solution must not exceed 0.2mL.
The laboratory adopts a modular digestion furnace, which can digest 20 samples at a time, the digestion temperature is easy to control, and the cycle is short. The Kjeldahl nitrogen analyzer has a high-precision color sensor that can accurately determine the end point, and can automatically complete the distillation, titration, calculation, and row Liquids and cleaning procedures, a sample determination takes only 5min, reducing the random error, the data is accurate and reliable. Determination of crude protein content in crops and foods using the Kjeldahl nitrogen analyzer can greatly increase detection efficiency, accuracy, and precision.
Select a representative seed to pick clean and shell, sample and grind, pass 0.42mm sieve. Weigh 0.5g sample 2 copies, accurate to 0.0001g, according to the national standard GB5497-1985 determine the moisture content of the sample. Open the digester and preheat it so that the temperature reaches 420 °C for digestion. Place the test crop sample in a 250-mL digestive canal (be careful not to adhere to the wall to prevent incomplete digestion). Except for soybean crop plus 1 g sample, all other crops are 0.5-1.0 g. After adding the digestion tablets 5g, then add 12 ~ 15mL concentrated sulfuric acid, gently shaking the digestive tube, the sample was wet with sulfuric acid. The digestion tube was placed on a digester preheated to 420°C and the suction pump was turned on to a maximum. After 5 minutes, a small suction pump was turned off until the acid mist just filled the exhaust hood and a condensation ring was formed in the test tube. About 90 min sample digestion to a clear blue-green liquid, remove and cool to room temperature. Put the digestive tube into the FOSS8400 automatic Kjeldahl nitrogen analyzer, close the safety gate, set the list, and start the sample loading after registration. The instrument performs automatic distillation, titration, result calculation, and cleaning. Instead of using 0.1g of sucrose as a blank sample, the volume of the spent acid standard solution must not exceed 0.2mL.
The laboratory adopts a modular digestion furnace, which can digest 20 samples at a time, the digestion temperature is easy to control, and the cycle is short. The Kjeldahl nitrogen analyzer has a high-precision color sensor that can accurately determine the end point, and can automatically complete the distillation, titration, calculation, and row Liquids and cleaning procedures, a sample determination takes only 5min, reducing the random error, the data is accurate and reliable. Determination of crude protein content in crops and foods using the Kjeldahl nitrogen analyzer can greatly increase detection efficiency, accuracy, and precision.
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