Portable Raman spectrometer is an important tool for on-site rapid, non-contact detection, which has obvious advantages in the detection of liquid samples. On June 23, 2018, the 11th China Food Safety Testing Technology Summit Forum hosted by Guolian Co., Ltd. and the Food Safety and Testing Network was held in Hangzhou. Professor Li Changhou from the Shanghai Bioengineering Research Center of the Chinese Academy of Sciences The latest developments in the application of Mann Spectrometer and its application in food testing, introduced the current situation of the application of portable green laser pointer Raman spectroscopy instruments to the audience, and encouraged the representatives of the purchasing units to rationally treat Chinese and foreign instruments.
At the beginning of the report, Li Changhou first gave a brief explanation of the latest developments in the instrument. He pointed out that the development of chemometrics has promoted the replacement of laser Raman spectroscopy instruments. At present, scientists and technicians are paying attention to the latest developments in portable laser Raman spectroscopy instruments and their applications. Various countries are actively developing various types of portable laser Raman spectroscopy instruments. More than 20 companies in China are developing and producing various types of portable laser Raman spectroscopy instruments (including foreign-funded enterprises). The latest advances in portable laser Raman spectroscopy instruments are mainly reflected in the following aspects:
First, the S/N of the instrument has been greatly improved. From the instrumental theory, S/N is closely related to the stability of the laser, the SBW of the monochromator, the stray light, the light shed and the collimating mirror, the aperture of the objective lens, and the sensitivity of the CCD. Therefore, the light source is a portable instrument of 785 nm, and the S/N measured directly is generally within 1000:1. The 785nm new ExR510 portable laser Raman spectrometer developed by Beijing Xipaite Company adopts China’s unique patented technology to eliminate fluorescent background and noise reduction. The tested S/N is better than 2000:1, which is the same in the international similar instruments. The leader.
Second, the resolution of the instrument is greatly enhanced. The resolution of the portable green laser pointer Raman spectroscopy instrument is between 4-12 cm-1 in the world. France JY company large desktop laser Raman spectrometer focal length of 800mm, although the instrument uses a high-quality light shed, three-level spectrum and other structures, but the resolution is only between 0.5-0.8cm-1, and it is difficult to improve. It is currently known that Beijing West Pitt’s ExR510 has a resolution of 2.8cm-1, which is at the international advanced level.
Third, new types of laser Raman spectroscopy instruments are emerging. In 2017, Agilent introduced the latest Raman patented technologies: Spatial Displacement Raman Spectroscopy (SORS) and Transmission Raman Spectroscopy (TRS). Among them, SORS is very versatile, and TRS is more accurate when doing quantitative analysis. In March 2018, Bidatek launched the new perspective Raman spectrometer STRaman, which won the Gold Medal for Excellence in the Pittsburgh Analytical Chemistry and Spectroscopy Applications Conference and Exhibition. China’s Nanjing Jianzhi Instrument Co., Ltd. recently launched the first portable differential Raman spectrometer with anti-interference, large signal-to-noise ratio and other advantages, which is worth looking forward to.
Fourth, the joint use of technology has greatly developed. Li Changhou pointed out that the great development of joint technology has become one of the main trends in the development of analytical instruments in the world today. The thin-layer scanning-portable laser Raman spectroscopy instrument and its application in the “12th Five-Year” major instrument special project of the Ministry of Science and Technology of the People’s Republic of China has passed the technical acceptance. The instrument has the characteristics of small size, light weight and high degree of automation. International initiative.