Rapid Determination of Amino Acids of Nitraria tangutorum Bobr. from the Qinghai-Tibet Plateau Using HPLC-FLD-MS/MS and a Highly Selective and Sensitive Pre-Column Derivatization Method
作者:Wu Zhou、Yuwei Wang、Fang Yang、Qi Dong、Honglun Wang、Na Hu
DOI:10.3390/molecules24091665
日期:——
Aminoacids are indispensable components of living organisms. The high aminoacid content in Nitraria tangutorum Bobr. fruit distinguishes it from other berry plants and is of great significance to its nutritional value. Herein, using 10-ethyl-acridine-3-sulfonyl chloride as a fluorescent pre-column labeling reagent, a method for the efficient and rapid determination of aminoacid content in N. tangutorum
Tagging Peptides with a Redox Responsive Fluorescent Probe Enabled by Photoredox Difunctionalization of Phenylacetylenes with Sulfinates and Disulfides
regio- and stereoselectivity. Moreover, this powerful tactic could be employed to tag cysteine residues of complex polypeptides in solution or on resin merging with solid phase peptide synthesis (SPPS) techniques. A sulfonyl-derived redox responsive fluorescent probe could be conveniently introduced on the peptide, which displays green fluorescence in cells while showing blue fluorescence in medium
在此,我们描述了芳基炔烃与二烷基二硫化物和烷基亚磺酸盐直接发生的光氧化还原三组分原子转移自由基加成 (ATRA) 反应,避免了使用化学不稳定且具有合成挑战性的S-烷基烷基硫代磺酸盐作为可行的加成伙伴。大量的 ( E)-β-烷基磺酰基乙烯基烷基硫化物的制备具有很好的区域选择性和立体选择性。此外,这种强大的策略可用于标记溶液中复杂多肽的半胱氨酸残基或在树脂上与固相肽合成 (SPPS) 技术合并。可以方便地将磺酰基衍生的氧化还原响应荧光探针引入肽上,其在细胞中显示绿色荧光,而在培养基中显示蓝色荧光。光物理研究表明,发射荧光的红移证明羰基还原为相应的羟基部分。有趣的是,标记肽的荧光变化可以通过 H 2 O 2处理在细胞中恢复,由于活性氧 (ROS) 水平升高,羟基再氧化回酮而产生。