Fractionation of Rubber by Column Absorption Chromatography. and Its Chemical Composition

extraction and acetylation of purified trypsin from bovin pancreas and study of some its physico-chemical properties

آنزیم تریپسین در شرایط قلیایی ناپایدار می باشد .و فعالیت پروتئولیتیکی تریپسین منجربه خود هضمی آن در جایگاههای خاصی می گردد. بنابر این آنزیمی با ناپایداری بالا محسوب میگردد. در سالهای اخیر موفق شدند که با ایجاد تغیرات شیمیایی با اضافه کردن فلزات خاص ، کلسیم و یا عمل استیلاسیون منجر به افزایش پایداری آنزیم تریپسین گردند. مطالعات در حال حاضر نشان می دهد که تریپسین استیله شده فعالیت آنزیمی خود را ...

Fractionation of PCDDs, PCBs, and pesticides by column chromatography on exfoliated graphites.

Enzymically iodinated human salivary proteins. Fractionation and characterization by column chromatography and electrofocusing.

Human salivary proteins were enzymically iodinated by the 125I-lactoperoxidase system. The proteins were than subjected to DEAE-cellulose column chromatography, preparative column electrofocusing and thin-layer polyacrylamide-gel electrofocusing. The radioactivity in the resolved protein pools and bands was determined. Results show that salivary proteins differ in their susceptibility to iodina...

Crystallization Elution Fractionation: measure the Chemical Composition

The introduction of single site catalysts and multiple reactor technology allows the design of new Polyolefin resins with improved properties for each particular application, and the Chemical Composition Distribution (CCD) has become the most discriminating microstructure parameter in these polymers. The proper analysis of the CCD necessarily requires a fractionation process, typically done acc...

Anti-Asthma effect of an active components group from decoction of Pheretima Aspergillum and its chemical composition characterized by Liquid chromatography-quadrupole time of flight mass spectrometry

The decoction of Pheretima aspergillum is used as a traditional medicine for treatment of asthma in China with a long clinical history. The aim of the study was to investigate the anti-asthma activities of an active components group obtained from the decoction of Pheretima aspergillum in histamine and ovalubumin induced asthma guinea pigs. The incubation period of asthma, serum IFN-γ, IL-4 and ...