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1.  Pulmonary histoplasmosis in a renal allograft recipient 
Indian Journal of Nephrology  2014;24(2):120-123.
Histoplasmosis, seen rarely in kidney transplantracipients, can vary from an innocuous illness often misdiagnosed as tuberculosis to a severe disseminated disease with a high mortality. We describe a case with non-specific signs in whom the diagnosis was made by histopathological examination of the lesion. Prompt introduction of specific treatment led to Histoplasmosis, seen rarely in kidney transplantracipients, can vary from an innocuous illness often misdiagnosed as tuberculosis to a severe disseminated disease with a high mortality. We describe a case with non-specific signs in whom the diagnosis was made by histopathological examination of the lesion. Prompt introduction of specific treatment led to the patient making an excellent recovery the patient making an excellent recovery.
doi:10.4103/0971-4065.127907
PMCID: PMC3968601  PMID: 24701047
Histoplasmosis; intracellular yeasts; renal allograft recipient
2.  Rapid Estimation of Tadalafil by Reverse-phase High-performance Liquid Chromatography Method in Bulk and Tablet Formulation 
The simple, selective, precise and accurate reverse-phase high-performance liquid chromatography method was developed and validated for analysis of tadalafil in bulk and tablet dosage form. The column was Inertsil C18 (150×4.6 mm; 5 μm) in isocratic mode. The mobile phase used was phosphate buffer (10 mM, pH 3.2) and acetonitrile (50:50% v/v) at the flow rate of 1.0 ml/min with ultraviolet detection at 295 nm at ambient temperature. The retention time for tadalafil was found to be 4.01 min. Linearity was observed in the concentration range from 60 to 140 μg/ml for tadalafil with a correlation coefficient of (r2) 0.9998. The method was validated according to International Conference on Harmonisation guidelines in terms of linearity, accuracy, precision and specificity. Hence, the proposed method can be utilized for routine quality control of tadalafil in bulk and tablet dosage form.
PMCID: PMC3757865  PMID: 24019575
International conference on harmonisation guidelines; reverse phase high performance liquid chromatography; tadalafil; ultraviolet detection; validation
4.  Development and Validation of an HPLC Method for Karanjin in Pongamia pinnata linn. Leaves 
A rapid, simple and specific reversed-phase HPLC method has been developed for analysis of karanjin in Pongamia pinnata Linn. leaves. HPLC analysis was performed on a C18 column using an 85:13.5:1.5 (v/v) mixtures of methanol, water and acetic acid as isocratic mobile phase at a flow rate of 1 ml/min. UV detection was at 300 nm. The method was validated for accuracy, precision, linearity, specificity. Validation revealed the method is specific, accurate, precise, reliable and reproducible. Good linear correlation coefficients (r2>0.997) were obtained for calibration plots in the ranges tested. Limit of detection was 4.35 μg and limit of quantification was 16.56 μg. Intra and inter-day RSD of retention times and peak areas was less than 1.24% and recovery was between 95.05 and 101.05%. The established HPLC method is appropriate enabling efficient quantitative analysis of karanjin in Pongamia pinnata leaves.
doi:10.4103/0250-474X.102547
PMCID: PMC3507349  PMID: 23204626
HPLC; karanjin; Pongamia pinnata; quantification; validation
6.  Inhibition of erythrocyte sickling in vitro by pyridoxal. 
Journal of Clinical Investigation  1978;62(4):888-891.
To test the antisickling activity of pyridoxal, we compared the oxygen affinity and the percent sickling at low PO2 of untreated erythrocytes with values for cells from the same blood sample incubated with pyridoxal, glyceraldehyde, or pyridoxine. Pyridoxal increased oxygen affinity much more than glyceraldehyde. 20 mM pyridoxal and glyceraldehyde had equivalent antisickling activity. At PO2 levels above 20 mm Hg, both agents reduced sickling to less than 2%. In samples examined by electron microscopy, pyridoxal reduced the percent sickled cells and the percent cells that contain hemoglobin S fibers by the same amount (from 74 to 3%). Pyridoxine had no effect on oxygen affinity or sockling. Pyridoxal reacts with intracellular hemoglobin to increase oxygen affinity, which inhibits hemoglobin S polymerization and sickling.
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PMCID: PMC371842  PMID: 701485

Results 1-6 (6)