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Factory Outlets Pd-L1 Mab Bavencio - D-Tryptophan Cas: 153-94-6 99% White or off-white powder – XD BIOCHEM

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Factory Outlets Pd-L1 Mab Bavencio - D-Tryptophan Cas: 153-94-6 99% White or off-white powder – XD BIOCHEM Detail:

Catalog Number XD90296
Product Name D-Tryptophan

CAS

153-94-6

Molecular Formula

C11H12N2O2

Molecular Weight

204.22518
Storage Details Room temperature

Harmonized Tariff Code

29339980

 

Product Specification

Assay 99%
Appearance White or off-white powder

 

Spiral tube assembly counter-current chromatography was successfully applied in enantioseparation of dl-tryptophan using bovine serum albumin as chiral selector. An improved biphasic aqueous-aqueous solvent system 12.0% (w/w) polyethyleneglycol 8000-9.0% (w/w) dibasic potassium phosphate-0.1% ammonia-78.9% water was used as the solvent system for counter-current chromatography, in which bovine serum albumin was predominantly distributed in the lower phase of the two-phase aqueous system. The aqueous-aqueous solvent system gave a very high enantioselectivity for d- and l-tryptophan at α=2.605 along with distribution ratio DD=1.200 and DL=0.461. High peak resolution was obtained for enantioseparation of 2.0mg of dl-tryptophan by spiral tube assembly counter-current chromatography under room temperature. It was found that 0.1% ammonia added in the aqueous-aqueous solvent system greatly improved the enantioseparations. An unusual extremely broad peak for l-tryptophan was observed during en antioseparations. In order to give an explanation, mass transfer rates of d- and l-enantiomers through the interface between the two phases were measured. It was found that l-tryptophan showed lower mass transfer rate than d-tryptophan. Further discussions were proposed for possible reasons for mass transfer rate difference between the enantiomers.


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Our well-equipped facilities and superb good quality control throughout all stages of manufacturing enables us to guarantee total buyer gratification for Factory Outlets Pd-L1 Mab Bavencio - D-Tryptophan Cas: 153-94-6 99% White or off-white powder – XD BIOCHEM , The product will supply to all over the world, such as: Comoros, Norway, Malta, We adopted technique and quality system management, based on "customer orientated, reputation first, mutual benefit, develop with joint efforts", welcome friends to communicate and cooperate from all over the world.
  • The company leader recept us warmly, through a meticulous and thorough discussion, we signed a purchase order. Hope to cooperate smoothly
    5 Stars By Anastasia from Oslo - 2017.12.09 14:01
    The after-sale warranty service is timely and thoughtful, encounter problems can be resolved very quickly, we feel reliable and secure.
    5 Stars By Althea from Bulgaria - 2017.10.13 10:47
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    Factory Outlets Pd-L1 Mab Bavencio - D-Tryptophan Cas: 153-94-6 99% White or off-white powder – XD BIOCHEM