A fast and selective reversed-phase HPLC was developed and validated for the quantitation of degradation products. Two major degradation products observed in stress study samples were isolated and characterized using chromatography and high resolution FT-MS. Abamectin
and its degradation products presented similar masses at m/z 873.49848 Da, and were further distinguished by MSn studies, H/D exchange studies, H-1, C-13 and 2D NMR experiments. The interpretation of analytical data positively Dinaciclib chemical structure identified unknown 1 as the stereoisomer 2-epi-abamectin and unknown 2 as the regioisomer Delta 2,3-abamectin. The developed HPLC method was found to be precise, Ubiquitin inhibitor accurate and detector response was linear for the analysis of known degradation products at the identification threshold.”
“Introduction: The Clinical Opiate Withdrawal Scale (COWS) is an 11-item clinician-administered scale assessing opioid withdrawal. Though commonly used in clinical practice, it has not been systematically validated. The present study validated the COWS in comparison to the validated Clinical Institute Narcotic Assessment
(CINA) scale.
Method: Opioid-dependent volunteers were enrolled in a residential trial and stabilized on morphine 30 mg given subcutaneously four times daily. Subjects then underwent double-blind, randomized challenges of intramuscularly administered placebo and naloxone (0.4 mg) on separate days, during which the COWS, CINA, and visual analog scale (VAS) assessments were concurrently obtained. Subjects completing both challenges were included (N=46). Correlations between
mean peak COWS and CINA scores as well as self-report VAS questions were calculated.
Results: Mean peak COWS and CINA scores of 7.6 and 24.4, respectively, occurred on average 30 min post-injection of naloxone. Mean COWS and CINA scores 30 min after placebo injection were 1.3 and 18.9, respectively. GSK1210151A purchase The Pearson’s correlation coefficient for peak COWS and CINA scores during the naloxone challenge session was 0.85 (p < 0.001). Peak COWS scores also correlated well with peak VAS self-report scores of bad drug effect (r=0.57, p < 0.001) and feeling sick (r=0.57, p < 0.001), providing additional evidence of concurrent validity. Placebo was not associated with any significant elevation of COWS, CINA, or VAS scores, indicating discriminant validity. Cronbach’s alpha for the COWS was 0.78, indicating good internal consistency (reliability).
Discussion: COWS, CINA, and certain VAS items are all valid measurement tools for acute opiate withdrawal. (C) 2009 Elsevier Ireland Ltd. All rights reserved.