Differentiating Westlake Longjing tea from the first- and second-grade producing regions using ultra high performance liquid chromatography with quadrupole time-of-flight mass spectrometry-based untargeted metabolomics in combination with chemometrics was written by Zhang, Qian;Zhang, Yu-Ying;Liu, Zhi;Zhang, Yue-Ming;Lu, Ning;Hai, Guo-Qing;Shao, Sheng-Zhi;Zheng, Qing-Xia;Zhang, Xia;Fu, Hai-Yan;Bai, Chang-Cai;Yu, Yong-Jie;She, Yuanbin. And the article was included in Journal of Separation Science in 2020.Safety of H-D-Trp-OH This article mentions the following:
There are numerous articles published for geog. discrimination of tea. However, few research works focused on the authentication and traceability of Westlake Longjing green tea from the first- and second-grade producing regions because the tea trees are planted in a limited growing zone with identical cultivate condition. In this work, a comprehensive anal. strategy was proposed by ultrahigh performance liquid chromatog.-quadrupole time-of-flight mass spectrometry-based untargeted metabolomics coupled with chemometrics. The automatic untargeted data anal. strategy was introduced to screen metabolites that expressed significantly among different regions. Chromatog. features of metabolites can be automatically and efficiently extracted and registered. Meanwhile, those that were valuable for geog. origin discrimination were screened based on statistical anal. and contents in samples. Metabolite identification was performed based on high-resolution mass values and tandem mass spectra of screened peaks. Twenty metabolites were identified, based on which the two-way encoding partial least squares discrimination anal. was built for geog. origin prediction. Monte Caro simulation results indicated that prediction accuracy was up to 99%. Our strategy can be applicable for practical applications in the quality control of Westlake Longjing green tea. In the experiment, the researchers used many compounds, for example, H-D-Trp-OH (cas: 153-94-6Safety of H-D-Trp-OH).
H-D-Trp-OH (cas: 153-94-6) belongs to indole derivatives. Indole produced by Proteus, Pseudomonas, Escherichia and other species was shown to be a growth promoting factor in Arabidopsis thaliana. They are capable of binding to a variety of receptors with high affinity and thus have applications in a wide range of therapeutic areas.Safety of H-D-Trp-OH
Referemce:
Indole alkaloid derivatives as building blocks of natural products from聽Bacillus thuringiensis聽and聽Bacillus velezensis聽and their antibacterial and antifungal activity study,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles