Four new 6-substituted amino purine derivatives were synthesized from guanine by acylation, chlorination and hydrolysis to give 2-amino-6-chloropurine, which was subjected to condensation with toluenethiol and then reaction with substituted amines.

Review of purine derivatives in urine to estimate rumen microbial protein production;

Effect of different dietary levels on excretion of urinary purine derivatives in young buffalo

The chromatographic behavior of purine derivatives on a new cucurbit[6]uril monorotaxane-bonded silica stationary phase(CB6MRBS) was studied using high performance liquid chromatography both under normal and reversed-phase modes.

8 g/head/d) of supplemental lanthanum chloride to evaluate the effects of different lanthanum chloride levels on ruminal pH,NH3-N,VFA,nutrients degradability and purine derivatives of urine.

A method of high performance liquid chromatography(HPLC) coupled with UVD was developed for the determination of purine derivatives(PD),including allantoin,creatinine,uric acid,xanthine and hypoxanthine,and creatinine in white yak\'s urine and plasma samples.

【Objective】The objective of this study was to evaluate the effects of glycerol supplementation on rumen fermentation, urinary excretion of purine derivatives, nutrients digestibility, energy metabolism and nitrogen balance of steers.