Simultaneous Measurements of Creatinine and Purine Derivatives in Ruminant's Urine Using Ion‐Pair HPLC

References

• Dewhurst , P. R. , Davies , D. R. and Merry , R. J. 2000 . Microbial protein supply from the rumen . Anim. Feed Sci. Technol. , 85 : 1 – 21 .
   Web of Science ®Google Scholar
• Topps , J. H. and Elliot , R. C. 1965 . Relationship between concentration of ruminal nucleic acids and excretion of purine derivatives by sheep . Nature , 205 : 498 – 499 .
   PubMed Web of Science ®Google Scholar
• Chen , X. B. , De Hovell , F. D. B. , Orskov , E. R. and Brow , D. S. 1990a . Excretion of purine derivatives by ruminants: effect of exogenous nucleic acid supply on purine derivative excretion by sheep . Br. J. Nutr. , 63 : 131 – 142 .
   PubMed Web of Science ®Google Scholar
• Chen , X. B. , Mejia , A. T. , Kyle , D. J. and Orskov , E. R. 1995 . Evaluation of the use of the purine derivative: creatinine ratio in spot urine and plasma samples as an index of microbial protein supply in ruminants: studies in sheep . J. Agric. Sci. (Cambs.) , 125 : 137 – 143 .
   Web of Science ®Google Scholar
• Antoniewicz , A. N. , Heinemann , W. W. and Hanks , E. M. 1981 . Effect of level of feed intake and body mass on allantoin excretion and the allantoin: creatinine ratio in the urine of sheep . Roczniki Naukowe Zootechniki. , 8 : 49 – 65 .
   Google Scholar
• Balcells , J. , Guada , J. A. , Castrillo , C. and Gasa , J. 1991 . Urinary excretions of allantoin and allantoin precursors by sheep after different rates of purine infusion into the duodenum . J. Agric. Sci. Cambridge. , 116 : 309 – 317 .
   Web of Science ®Google Scholar
• Resines , J. A. , Arín , M. J. and Díez , M. T. 1992 . Determination of creatinine and purine derivatives in ruminants' urine by reversed‐phase high‐performance liquid chromatography . J. Chromatogr. , 607 : 199 – 202 .
   PubMed Web of Science ®Google Scholar
• Díez , M. T. , Arín , M. J. and Resines , J. A. 1992 . Simultaneous determination of allantoin and creatinine in urine by a rapid reversed‐phase liquid chromatographic method . J. Liq. Chromatogr. , 15 : 1337 – 1350 .
   Web of Science ®Google Scholar
• Shingfield , K. J. and Offer , N. W. 1999 . Simultaneous determination of purine metabolites, creatinine and pseudouridine in ruminant urine by reversed‐phase high‐performance liquid chromatography . J. Chromatogr. B. , 723 : 81 – 94 .
   PubMed Web of Science ®Google Scholar
• Balcells , J. , Guada , J. A. and Peiro , J. M. 1992 . Simultaneous determination of allantoin and oxypurines in biological fluids by high‐performance liquid chomatography . J. Chromatogr. , 575 ( 1 ) : 153 – 157 .
   PubMed Web of Science ®Google Scholar
• Chen , X. B. , Kyle , D. J. and Orskov , E. R. 1993 . Measurement of allantoin in urine and plasma by high‐performance liquid chormatography with precolumn derivatisation . J. Chromatogr. , 617 : 241 – 247 .
   PubMed Web of Science ®Google Scholar
• Resines , J. A. , Arín , M. J. , Díez , M. T. and García del Moral , P. 1999 . Ion‐pair reversed‐phase determination of creatinine in urine . J. Liq. Chrom. & Rel. Technol. , 22 ( 16 ) : 2503 – 2510 .
   Web of Science ®Google Scholar
• Miller , J. N. and Miller , J. C. 2002 . “ Métodos de calibración en análisis instrumental: regresión y correlación ” . In Estadística y Quimiometría para Química Analítica Edited by: Capella , I. 111 – 155 . Madrid : Pearson Educación, S.A. .
   Google Scholar