Collagen is the most abundant protein in mammals, accounting for 25% to 30% of the total protein. It is widely present in all tissues from the body surface of lower vertebrates to mammalian bodies. Collagen monomers are long cylindrical proteins with a length of about 280 nm and a diameter of 1.4–1.5 nm. It consists of 3 polypeptide chains that are supercoiled around each other. Collagen,Collagen Peptides,Collagen costco,Collagen Peptide Products YT(Xi'an) Biochem Co., Ltd. , https://www.ytwholefood.com
Comparison and explanation of energy dispersion and wavelength dispersion X-ray fluorescence spectrometer
1. Measurement Accuracy: The wavelength dispersion X-ray fluorescence spectrometer has its inherent high resolution and high precision, which can provide extremely high stability and excellent analysis accuracy, but requires sample shape and preparation method; energy dispersion X Fluorescence spectrometers, if carefully designed and optimized, provide industry-accepted measurements. One of the advantages is that data can be referenced without processing the sample. At present, wavelength-dispersive instruments have also been localized. Compared with similar instruments, imported instruments do not have an advantage in accuracy, but the price is much more expensive.
2, measurement time: due to the wavelength dispersion with a larger power X-ray tube, the fluorescence intensity is high; therefore, the wavelength dispersion X-ray fluorescence spectrometer takes up a short measurement time, can achieve higher measurement accuracy.
3. Requirements of the sample to be measured: Due to the difference in technical characteristics, the wavelength dispersion X-ray fluorescence spectrometer requires simple processing of the sample to be measured; the general treatment method for the solid sample is to smooth the surface of the sample to be measured, for powder and other samples. It can be processed by powder compaction after grinding, and the corresponding equipment is easy to find on the market. The biggest advantage of the energy dispersive X-ray fluorescence spectrometer is that it can be directly measured without special processing of the sample, and there is no damage to the sample. It is suitable for direct use in the process control of production; but it should be emphasized that: from fluorescence In theory, the pre-treatment of the sample to be measured is necessary. For the energy dispersive instrument, we can take some technical means to correct it to meet the needs of actual production control, but even if the technical correction method is adopted, the irregular sample is used. Direct measurement is also at the expense of measurement accuracy.
4, the best application range: due to the technical characteristics of the wavelength dispersion and energy dispersion type X fluorescence spectrometer, the application schemes of the two types of instruments are not the same; the wavelength dispersion X-ray fluorescence spectrometer has higher measurement accuracy, but at the same time It is necessary to carry out simple processing on the sample to be measured, and is more suitable for accurate detection and quality control of incoming raw materials, semi-finished products and finished products; energy dispersive X-ray fluorescence spectrometer has the advantages of rapid and direct measurement of samples of various shapes although the measurement accuracy is slightly poor. Therefore, it can be directly used in the production line for the detection of various components and electronic components.
5, energy resolution: energy resolution is the main indicator of X fluorescence spectrometer instrument, the smaller the resolution value, the higher the resolution, the better the instrument performance.
6. Fluorescence intensity: For X-ray fluorescence spectrometer, the content of each element is proportional to the fluorescence intensity of the element; the higher the fluorescence intensity, the smaller the statistical error, the higher the accuracy of the measurement, the better the instrument performance.
7. Service life: wavelength dispersion type X fluorescence spectrometer has a service life of more than 10 years; the service life of energy dispersive X-ray fluorescence spectrometer mainly depends on the service life of X-ray tube and detector, and the service life varies with working conditions. Randomness.
This article is reproduced from: http://