GC-MS分析柠檬挥发油的化学成分
In this study, UPLC-QTOF-MS technology combined with UNIFI software was used for the first time to characterize the chemical composition of the WDD material reference. The performed research showed that the established method could quickly identify the chemical composition of WDD and quickly evaluate...
Sure, that test is important, I’m not negating that fact... but that’s ONE test, ONE piece of the puzzle, but that doesn’t prove you’re receiving a THERAPEUTIC GRADE essential oil! There is NOT one analytical technique that will reveal every component in an oil. There are MANY co...
However, due to the lack of systematic and in-depth analysis of the chemical composition of Choerospondias axillaris, it is difficult to develop high value-added products, resulting in low processing efficiency and even direct abandonment. In order to improve the application value of Choero...
Nevertheless, a detailed analysis of the chemical composition of an LHQW capsule has not yet been reported. Orbitrap mass spectrometry (MS) has become a powerful tool to characterize the chemical components in TCMs because of its high sensitivity, high mass resolution, and high mass accuracy [13...
Metallic Materials Engineering shall be consulted to specify the proper grade if annealing, normalizing, stress relief, or welding is to be performed. This standard covers the mechanical properties, chemical composition, weldability, cleanability, and surface requirements for high strength steels. MS-...
The exact composition of the RM (e.g., a synthetic chemical standard mixture or a matrix-matched RM) will dictate its utility in alignment within the chromatographic retention time, m/z, and signal intensity (i.e., response factor) dimensions and the extent of its applicability to the ...
sinensis has mainly focused on leaf and seed chemical composition [1,22], while the chemical composition and volatile contents of different organs of A. sinensis have not been systematically studied. Therefore, herein, the chemical composition of volatile components and alcohol extracts of different ...
All chemicals such as methanol, hydrocarbons (HC) and DMSO (LC-MS/MS grade), fatty acid methyl esters (FAME) standards and acarbose (≥ 95%) were purchased from Sigma–Aldrich (St. Louis, MO, USA). Similarly,Saccharomyces cerevisiae α-glucosidase (EC 3.2.1.20) of 0.05 U/ml (type ...
Grade 45 S45C C45/1.1191 1045 EN8D/C45E 3: EN C45 steel chemical composition Grade Grade C Mn P S Si Ni Cr ASTM A29 1045 0.43-0.50 0.60-0.90 0.04 0.050 EN 10083-2 C45/1.1191 0.42-0.50 0.50-0.80 0.03 0.035 0.4 0.4 0.4 JIS G4051 S45C 0.42-0.48 0.60-0.90 0.03 0.035 ...