Research Article

Novel Spectrophotometric Method for the Quantitation of Urinary Xanthurenic Acid and Its Application in Identifying Individuals with Hyperhomocysteinemia Associated with Vitamin Deficiency

Table 1

Precision studies results.

XA determined by the proposed method (mg/L)*Indirect activation coefficient (AC) test for RBC/AST**

Within-run ( )*
 Mean, mg/L20.241.0
 SD, mg/L0.601.5
 CV, %3.03.7
Day-to-day ( )**
 Mean, mg/L20.241.0
 SD, mg/L0.71.9
 CV, %3.54.6

Each level of pooled urine sample was determined simultaneously for 5 times at the same day.
**Each level of pooled urine sample was run 5 times per day for five consecutive days. The pooled data were then calculated for mean, SD and CV.