Quality by design approach for simultaneous estimation of doxycycline hyclate and curcumin by RP-HPLC method

A simple, rapid, reliable, robust and optimized reversed phase high performance liquid chromatographic method for simultaneous estimation of doxycycline hyclate and curcumin was successfully developed and validated as per International Conference on Harmonization guidelines. The objective was achieved in terms of well separated peaks within 10 min on a Waters Sunfire C8 column with dimensions of 250×4.6 mm, particle size 5.0 μm using mobile phase consisting of 30 volumes of potassium dihydrogen phosphate buffer (50 mM) adjusted to pH 6.5±0.1 with triethylamine and 70 volumes of methanol at flow rate of 0.85 ml/min. The column effluents were monitored at 400 nm maintained at ambient column temperature (28^o). The developed method was found linear over the concentration range of 200-700 μg/ml for doxycycline hyclate and 8-28 μg/ml for curcumin, the detection and quantitation limit was found to be 26.063 and 78.97 μg/ml for doxycycline hyclate; 0.795 and 2.13 μg/ml for curcumin, respectively. The developed method was optimized using Minitab software version 16 to meet the current quality by design requirements. The method validation was done for linearity, range, detection and quantitation limit, accuracy, precision, specificity, system suitability testing, and robustness.

Evaluation of the updated confocal laser endomicroscopy criteria for Barrett's esophagus among gastrointestinal pathologists

Previously developed novel probe-based confocal laser endomicroscopy (pCLE) criteria have been found to have high accuracy and substantial interobserver agreement (IOA) for diagnosing dysplasia in Barrett's esophagus (BE) when used by endoscopists. These updated criteria are: (i) epithelial surface: saw toothed, (ii) cells: enlarged, (iii) cells: pleomorphic, (iv) glands: not equidistant, (v) glands: unequal in size and shape, and (vi) goblet cells: not easily identified. The accuracy and IOA among pathologists in the diagnosis of dysplasia using the novel pCLE criteria is not known. The primary objective of the study was to evaluate the accuracy, overall IOA and learning curve among three gastrointestinal (GI) pathologists in diagnosing dysplasia in BE using the updated pCLE criteria. The secondary aim was to compare the accuracy and IOA between GI pathologists and gastroenterology endoscopists. Ninety pCLE videos and respective histology were retrieved from a previously conducted multicenter, prospective, randomized, controlled trial evaluating the utility of pCLE in BE patients. Videos were obtained from 101 BE patients previously enrolled for surveillance or endoscopic treatment of high-grade dysplasia or early esophageal adenocarcinoma. Three GI pathologists reviewed 90 pCLE video clips for dysplasia versus no dysplasia, confidence in their diagnosis, and image quality. The overall accuracy for the diagnosis of dysplasia (low-grade dysplasia/high-grade dysplasia/esophageal adenocarcinoma) was 77.8% (95% confidence interval [CI]: 72.4-82.3). The accuracy was higher when pathologists had 'high confidence' in their assessment of the videos (93.8% vs. 69.3%, P < 0.001). There was no significant difference in accuracy between the first set of 30 and second set of 60 videos (84% vs. 74%, P = 0.065). IOA among GI pathologists was substantial, k = 0.65 (95% CI: 0.53-0.73). The sensitivity for detecting dysplasia was 85% (95% CI: 78.1-90.7) and the specificity was 70% (95% CI: 61.91-77.92). These results were comparable with the evaluation of the same set of videos by endoscopists. GI pathologists have high accuracy and substantial IOA for diagnosing BE dysplasia with pCLE. Pathologists appear to have similar accuracy and IOA as endoscopists. These results provide further support of endoscopists accurately interpreting the in vivo optical histology provided by pCLE.

Development and Validation of an RP-HPLC Method for Quantitative Estimation of Eslicarbazepine Acetate in Bulk Drug and Tablets

A convenient, simple, accurate, precise and reproducible RP-HPLC method was developed and validated for the estimation of eslicarbazepine acetate in bulk drug and tablet dosage form. Objective was achieved under optimised chromatographic conditions on Dionex RP-HPLC system with Dionex C18 column (250×4.6 mm, 5 μm particle size) using mobile phase composed of methanol and ammonium acetate (0.005 M) in the ratio of 70:30 v/v. The separation was achieved using an isocratic elution method with a flow rate of 1.0 ml/ min at room temperature. The effluent was monitored at 230 nm using diode array detector. The retention time of eslicarbazepine acetate is found to be 4.9 min and the standard calibration plot was linear over a concentration range of 10-90 μg/ml with r(2)=0.9995. The limit of detection and quantification were found to be 3.144 and 9.52 μg/ml, respectively. The amount of eslicarbazepine acetate in bulk and tablet dosage form was found to be 99.19 and 97.88%, respectively. The method was validated statistically using the percent relative standard deviation and the values are found to be within the limits. The recovery studies were performed and the percentage recoveries were found to be 98.33± 0.5%.

Development and Validation of a RP-HPLC Method for Estimation of Prulifloxacin in Tablet Dosage Form

A simple, precise, rapid, accurate and economic reverse phase high performance liquid chromatographic method has been developed for the estimation of prulifloxacin in tablet dosage form. The separation was achieved by using octadecylsilane column (C₁₈) and KH₂PO₄ buffer: acetonitrile adjusted to pH 7.3 with triethyl amine in proportion of 10:90 v/v as mobile phase, at a flow rate of 1.0 ml/min. The detection was carried out at 278 nm. The retention time of prulifloxacin was found to be 2.4 min. The limit of detection and limit of quantitation were found to be 0.14 μg/ml and 0.42 μg/ml respectively. The accuracy and reliability of the proposed method was ascertained by evaluating various validation parameters like linearity, precision, accuracy and specificity according to ICH guidelines. The proposed method provides an accurate and precise quality control tool for routine analysis of prulifloxacin in tablet dosage form.

Development and Validation of a RP-Ultra performance liquid chromatographic Method for Quantification of Topotecan Hydrochloride in Bulk and Injection Dosage Form

A simple, very fast, precise and accurate reverse phase ultra performance liquid chromatographic method was developed for the determination and validation of topotecan hydrochloride in bulk and injection dosage form. A Waters BEH C18, 50×2.1 mm, 1.7 μm particle size column in gradient mode was used with mobile phase comprising of 0.1% v/v orthophosphoric acid in water and acetonitrile. The analytical column was thermostated at 50° and flow rate was set at 0.4 ml per min, with photo diode array detection at 260 nm. The retention time of topotecan was found 1.38 min. The method was validated in terms of linearity, accuracy, precision and specificity. The calibration curve was found linear between 20 to 60 μg/ml. The limit of detection and limit of quantification were found 0.2353 and 0.7131 μg/ml, respectively. Percentage recoveries were obtained in the range of 98.91% and 99.17%. The proposed method is precise, accurate, selective and reproducible. The ultra performance liquid chromatographic assay procedure, which proved superior because of its greater sensitivity and relatively shorter (4 min) run time, should be an important tool for speedy future analysis of topotecan hydrochloride in bulk and its injection dosage form.

Development and Validation of a RP-HPLC Method for Estimation of Montelukast Sodium in Bulk and in Tablet Dosage Form

The present work describes a simple, precise and accurate HPLC method for estimation of montelukast sodium in bulk and in tablet dosage form. The separation was achieved by using octadecylsilane column (C18) and acetonitrile:1 mM sodium acetate adjusted to pH 6.3 with acetic acid in proportion of 90:10 v/v as mobile phase, at a flow rate of 1.5 ml/min. Detection was carried out at 285 nm. The retention time of montelukast sodium was found to be 3.4 min. The limit of detection was found 1.31 µg/ml and limit of quantification 3.97 µg/ml. The accuracy and reliability of the proposed method was ascertained by evaluating various validation parameters like linearity (1-100 µg/ml), precision, accuracy and specificity according to ICH guidelines. The proposed method provides an accurate and precise quality control tool for routine analysis of montelukast sodium in bulk and in tablet dosage form.

Do patients with MGUS require a bone marrow biopsy?

8117

Monoclonal gammopathy of undetermined significance (MGUS) increase in prevalence with age and it is associated with risk of progression to plasma cell disorder. According to ASH guidelines, patients (pts) should have a complete blood count (CBC), creatinine, calcium, and a complete bone survey and periodic follow up. There has been no clear-cut guideline regarding the role of bone marrow biopsy in these patients. There is suggestion in the literature that bone marrow aspiration and biopsy is indicated if the M protein is 1.5 g/dL. Hypothesis We hypothesize that the increase in serum immunoglobulin is correlated with an increase in plasma cell in the bone marrow biopsy. Methods: We performed a retrospective chart review of 327 MGUS veteran patients seen from 2002 to 2005. Diagnostic criteria for MGUS were defined as <3 g/dL serum monoclonal protein, <10 % plasma cells in the bone marrow and absence of radiographic or laboratory abnormality related to the plasma cell proliferative process. Patients with smoldering myeloma were excluded. Bone marrow biopsies were available on 97/327 patients. Bone marrow biopsy with plasma cell percentage, serum protein electrophoresis (SPEP) and immunofixation (SFE), and immunoglobulin levels of these patients were retrieved and statistical analysis was performed by using Pearson correlation coefficient and linear regression analysis to detect the correlation between plasma cell percentage and immunoglobulin levels. Results: Of the 97 patients whom the bone marrow biopsy was available, 66 patients had IgG, 15 had IgA and 16 had IgM monoclonal paraprotein. There was linear correlation between serum IgG and IgA levels with the percentage of plasma cells in the bone marrow. (p< 0.001 and < 0.02 respectively. By regression analysis, using a cut off value of 10% plasma cells in the bone marrow, the predicted level of IgG and IgA immunoglobulin was 2124 mg /dl and 1564 mg/dl respectively. There was no correlation between IgM immunoglobulin and plasma cell percentage in the marrow. Conclusion: There is a linear correlation between serum IgG and IgA immunoglobulin with plasma cell percentage in the bone marrow. Bone marrow biopsy with plasma cell percentage of 10% or higher may be predicted in patients with MGUS with IgG or IGA above 2g/dl and 1.5g/dl respectively.

No significant financial relationships to disclose.

Carcinosarcoma with a large cell neuroendocrine epithelial component: first report of an unusual biphasic tumour of the urinary bladder

This article describes the first reported case of carcinosarcoma of the urinary bladder with a large cell neuroendocrine epithelial component. A 61 year old man presented with gross haematuria and underwent resection of a biphasic bladder tumour. The malignant epithelial component showed large cell neuroendocrine differentiation with immunohistochemical reactivity for neurone specific enolase, synaptophysin, and chromogranin. The malignant mesenchymal component did not show specific differentiation by histological or immunohistochemical examination. The differential diagnosis of biphasic tumours in the urinary bladder is discussed, along with a review of the literature.

Chronic lymphocytic leukemia presenting with symptomatic central nervous system involvement

Leukemic infiltration of the central nervous system (CNS) resulting in neurological manifestations is a rare complication of chronic lymphocytic leukemia (CLL). Furthermore, symptomatic CNS involvement as the initial presentation of previously undiagnosed CLL is extremely rare. In the present report, the authors describe a case of an 89-year-old female previously diagnosed with Alzheimer's disease who suddenly developed rapidly worsening mental changes. Cytological and immunocytological examinations of the lymphoid cells present on the cerebrospinal fluid (CSF) revealed CNS involvement by a clonal B-cell lymphoproliferative disorder, most consistent with de novo B-CLL expressing kappa light chain restriction. Subsequently, flow cytometric analysis done on the peripheral blood lymphocytes confirmed the diagnosis of B-CLL in this patient. Thus, this study shows the potential usefulness of immunocytological evaluation in detecting monoclonal lymphoid populations on CSF samples in adult patients presenting with altered mental status and CSF pleocytosis of lymphocytes.

Fibroma of tendon sheath of the infrapatellar fat pad

We report on a 13-year-old boy who was found to have a fibroma of the tendon sheath associated with the patellar tendon and within Hoffa's fat pad of the knee. This benign tumor has never been described in this location previously. The MRI characteristics are correlated with the histologic findings.

Cryptic Mucor infection leading to massive cerebral infarction at initiation of antileukemic chemotherapy

A 74-year-old man with newly diagnosed acute myelogenous leukemia unexpectedly suffered a massive cerebral infarct on day 2 of induction chemotherapy. Clinically, the hemorrhagic infarct was thought to be due to leukostasis and thrombocytopenia. Necropsy, however, revealed that Zygomycetes-type hyphae had infiltrated cerebral vessels in and near the infarct. The fungal infection was clinically silent otherwise, although fungal elements were also identified in the lung at autopsy. This case illustrates how closely fungal infection may resemble a leukemia-associated cerebrovascular accident.

Adenovirus infection of the renal allograft with sparing of pancreas graft function in the recipient of a combined kidney-pancreas transplant

We report a case of adenovirus infection of the renal allograft in a combined kidney/pancreas transplant recipient. The clinical presentation was renal allograft failure, which eventually reversed. The pancreatic graft function remained stable. A renal biopsy showed massive tubular necrosis associated with a prominent granulomatous reaction. The process had a striking regional distribution within the kidney with the injury and inflammation limited to the outer medulla. Adenovirus type 11 was isolated from renal tissue by culture, and adenovirus was demonstrated by immunofluorescence and electron microscopy in the kidney biopsy. Immunosuppression may result in unusual patterns of response to infectious agents. This case demonstrated tropism of the adenovirus to only selected tubules within the kidney, with sparing of other organ function including, specifically, the pancreas allograft. The differential diagnosis of a granulomatous reaction in the transplant kidney must be expanded to include viral infection, in particular, adenovirus.

Effect of oral erythromycin on colonic transit in patients with idiopathic constipation. A pilot study

Erythromycin, a motilin receptor agonist has been shown to have prokinetic effects on the upper gastrointestinal tract and gallbladder. Colonic effects of the drug are controversial, and it is debated whether human colon contains motilin receptors. In this study we evaluated the effects of erythromycin on colonic transit and stool frequency in 11 patients with idiopathic constipation over a 1-month period in an open study. The dose used was 1 g/day for two weeks followed by 500 mg/day for another two weeks. The mean (SE) total and segmental colonic transit was measured before and seven days after therapy in seven of these patients. A daily record of stool frequency was maintained in all 11 patients. Erythromycin shortened the total colonic transit from 86.2 (14.6) to 44.8 (8.99) hr (P < 0.01); however, segmental transit studies revealed a significant effect (P < 0.01) only in the right colon and rectosigmoid region. No significant side effects were observed with short-term therapy. These preliminary results suggest that erythromycin is of therapeutic value in patients with idiopathic constipation.

Assessment of intravenous streptokinase therapy in acute myocardial infarction

Ten patients presenting within 6 hours of myocardial infarction, without contraindication for thrombolytic therapy, were given intravenous (IV) streptokinase (STK) 750,000 units in 15-30 min by infusion followed by anticoagulant therapy. Treatment was started within 241-360 min after the onset of symptoms. Fifteen other patients were given standard treatment without STK. Reperfusion was observed after a mean duration of 46 min in 7 patients in the STK group and none in the non-STK group. The results of IV STK thrombolytic therapy are comparable with those of previous studies using IV STK.

Penile strangulation

Penile strangulation is a rare injury that requires urgent management. Non-metallic, thin objects are easy to remove but can cause severe injury. Metallic objects are difficult to remove but the injuries are usually less severe. Penile ulceration and oedema in children may well indicate the presence of a strangulation object. We describe a new hammer and chisel method for removing such objects.

A test of the bay-region mechanism in carcinogenesis for monomethyl benz[a]anthracenes in a self-consistent-field molecular orbital theory

The relative carcinogenic activity of the isomeric monomethyl derivatives of benz[a]anthracene has been studied on the basis of their bay-region reactivity, and the subsequent ease of carbonium ion formation, as obtained from a suitable 'self-consistent-field' molecular orbital theory for the mobile pi-electrons. The predicted order of carcinogenic activity of these molecules is compared with the available experimental data.