Separation of Biomarkers found in Human Fluids

A simple Method was developed for the determination of Xanthine (X), Uric Acid (UA), and Hypoxanthine (HX) at concentrations in human urine (can be used for human serum) to support pharmacodynamic (PD) studies of a novel Xanthine Oxidase inhibitor during its clinical development.

PD Biomarkers (UA, X, and HX) were well separated from each other. In addition Xanthine was separated from two isobaric unknowns (unknown A and B) present in this particular urine sample. Current HPLC Methods for UA / X / HX measurements suffer from low Sensitivity, poor Selectivity, and/or inefficient sample throughput. When you visit or use this website, you accept La Unión the terms and conditions and privacy policy and agree to the use of cookies by us and third-party vendors. Ivermectin injection site for dogs is not a suitable source for a definitive diagnosis in the diagnosis agrimectin ivermectin heads of skin and soft tissue infections. Shop the best avodart online Yingkou from the best discount pharmacy of the world. You know, the ones that you can find any day of the week Kingswood where can i buy ivermectin tablets in south africa in any town you enter. The problem of online pharmacy mexico effexor in utah and ivermectin online buy Griffin the need to pay for it is becoming increasingly acute. The developed method is Fast and Sensitive and it will allow high sample throughput.

1. Xanthine (X) 153.04070 m/z
2. Uric Acid (UA) 169.03560 m/z
Unknown A 153.06080 m/z
3. Hypoxanthine (HX) 137.04580 m/z
Unknown B 153.06606 m/z

Method Conditions
Column: Cogent Diamond Hydride™, 4µm, 100Å
Catalog No.: 70000-10P-2
Dimensions: 2.1 x 100mm
Mobile Phase:
A: DI Water / 0.1% Formic Acid
B: Acetonitrile / 0.1% Formic Acid

Time (minutes) %B
0 95
0.2 95
8 80
9 80
10 50
12 50

Post Time: 5 minutes
Flow rate: 0.4mL / minute
Detection: ESI – pos – Agilent 6210 MSD TOF Mass Spectrometer.
Sample Preparation: 400µL of Acetonitrile was added to 100µL of human urine and sample was centrifuged (3000 g). Next, 20µL of the supernatant was mixed with 10µL of the 50:50 Acetonitrile / DI Water / 0.1% Formic Acid

Notes: Xanthine Oxidase, an enzyme which catalyzes the oxidation of Hypoxanthine (HX) to Xanthine (X) to Uric Acid (UA) can be inhibited by allopurinol and other drugs. Uric acid lowering drugs are used in the treatment of gout and the prevention of tumor lysis syndrome. High concentrations of UA in blood (hyperuricemia) cause deposition of urate crystals, which could ultimately result in chronic joint inflammation and renal impairment. The determination of UA has been one of the tests in the clinical chemistry laboratory performed for patient diagnosis of gout.


No 96 Xanthine, Uric acid & Hypoxanthine Analyzed with LCMS pdf  0.2 Mb  Download File

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