China Well-designed Pd-L1 Tumor Immunotherapy - D-Tryptophan Cas: 153-94-6 99% White or off-white powder – XD BIOCHEM Manufacturer and Supplier

Well-designed Pd-L1 Tumor Immunotherapy - D-Tryptophan Cas: 153-94-6 99% White or off-white powder – XD BIOCHEM

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Well-designed Pd-L1 Tumor Immunotherapy - 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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