Crude Protein Testing in Biofertilizers and Feeds

With the continuous development of the livestock breeding and planting industry, the number of feed and fertilizer manufacturers has also increased rapidly, but the quality of products varies. Whether it is full-price feed and fertilizer or concentrated feed and fertilizer, the crude protein content is an important indicator to measure the quality of feed and fertilizer.

Crude protein is one of the most important indicators that must be checked during the quality assessment and authenticity of feed and fertilizer. Therefore, Lifeasible, with its extensive experience in feed and fertilizer quality testing and its well-established system, can provide customers with a variety of methods for testing crude protein content in samples.

Methods	Details
Semi-micro and macronutrient distillation Kjeldahl method	Feed and fertilizer samples and concentrated sulfuric acid are heated and digested in the presence of a catalyst, and the proteins are decomposed. The carbon and hydrogen are oxidized to carbon dioxide and water and escape, and the organic nitrogen is converted to ammonia, which is combined with sulfuric acid to become ammonium sulfate. We take a portion (semi-trace) or all (macronutrient) of the digest, distill it with alkali to allow the ammonia to evaporate, absorb it with boric acid and then titrate it. The protein content is calculated from the consumption of standard acid. This method is simple and inexpensive to perform.
Hyperspectral imaging method	This is a new method of non-destructive testing that combines spectroscopy and imaging. It can acquire both the image information of the sample under test at each waveband and the spectral information at each spatial pixel point of the sample. It has higher analytical detection potential. We used hyperspectral imaging technology combined with chemometric methods to develop a crude protein model in feed and fertilizer. We achieved rapid detection of crude protein content in samples by applying the crude protein model.
The fully automated protein determination system	The method is a semi-micro system with fully automatic digestion, fully automatic distillation, fully automatic titration, and result output based on the Kjeldahl method. The system provides great convenience for crude protein detection in feeds and fertilizers. It is safe, accurate, fast, and easy to operate. We first use a graphite digestion instrument to digest the sample, then the digestion solution is put on the automatic protein tester to fix and set the parameters. Distillation, nitrogen fixation, titration, and results are done in one step. The whole process can be completed within 10 min with guaranteed accuracy.
Near-infrared diffuse reflectance spectrometry	This method uses the vibrational absorption of organic matter in the near-infrared spectral region to rapidly determine the content of various chemical components in a sample. We have developed a method for the rapid determination of crude protein in feed and fertilizers using NIR diffuse reflectance spectroscopy. It improves detection efficiency and meets the needs of the evaluation of high-quality feed and fertilizer samples and rapid screening of authentic products.

Crude protein is an important indicator of feed and fertilizer authenticity and quality assessment. Lifeasible offers semi-micro and macronutrient distillation Kjeldahl methods, hyperspectral imaging, fully automated protein determination systems, and NIR diffuse reflectance spectroscopy for the rapid determination of crude protein in fertilizer and feed samples. Please contact our staff to learn how we can help you achieve rapid determination.