1
|
Anoop TM, Basu PK, Chandramohan K, Thomas A, Manoj S. Evolving utility of exosomes in pancreatic cancer management. World J Methodol 2023; 13:46-58. [PMID: 37456979 PMCID: PMC10348087 DOI: 10.5662/wjm.v13.i3.46] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 05/02/2023] [Accepted: 05/31/2023] [Indexed: 06/20/2023] Open
Abstract
Despite the development of newer oncological treatment, the survival of patients with pancreatic cancer (PC) remains poor. Recent studies have identified exosomes as essential mediators of intercellular communications and play a vital role in tumor initiation, metastasis and chemoresistance. Thus, the utility of liquid biopsies using exosomes in PC management can be used for early detection, diagnosis, monitoring as well as drug delivery vehicles for cancer therapy. This review summarizes the function, and clinical applications of exosomes in cancers as minimally invasive liquid biomarker in diagnostic, prognostic and therapeutic roles.
Collapse
Affiliation(s)
- Thattungal Manoharan Anoop
- Department of Medical Oncology, Regional Cancer Center, Medical College Campus, Thiruvananthapuram 695011, Kerala, India
| | - Palash Kumar Basu
- Department of Avionics, Indian Institute of Space Science & Technology (IIST), Thiruvananthapuram 695547, Kerala, India
| | - K Chandramohan
- Surgical Oncology, Regional Cancer Center, Thiruvananthapuram 695011, Kerala, India
| | - Ajai Thomas
- Department of Medical Oncology, Regional Cancer Center, Medical College Campus, Thiruvananthapuram 695011, Kerala, India
| | - S Manoj
- Department of Medical Oncology, Regional Cancer Center, Medical College Campus, Thiruvananthapuram 695011, Kerala, India
| |
Collapse
|
2
|
Lenin Sundar M, Ragunath S, Hemalatha J, Vivek S, Mohanraj M, Sampathkumar V, Mohammed Siraj Ansari A, Parthiban V, Manoj S. Simulation of ground water quality for noyyal river basin of Coimbatore city, Tamilnadu using MODFLOW. Chemosphere 2022; 306:135649. [PMID: 35817183 DOI: 10.1016/j.chemosphere.2022.135649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 06/20/2022] [Accepted: 07/05/2022] [Indexed: 06/15/2023]
Abstract
In recent years groundwater modelling has become a major part of many projects dealing with groundwater exploitation, protection and remediation. Coimbatore city is located along the Noyyal River which is grown in size and population on either side of the river and the dumping of wastes very close to the river banks, leads to pollution of both surface and groundwater. Study on the quality of groundwater along the Noyyal River in Coimbatore city of Tamilnadu, is necessary to safeguard the interest of the people with respect to quality and quantity of water. The objective of the research is to develop Groundwater quality models to suggest ways and means to contain and remediate the polluted groundwater under various conditions. Data related to the groundwater quality, rainfall and well log were collected from the reputed government departments and fifteen sample well locations are identified near the noyyal river basin. The quality parameters such as pH, TDS, EC, TH, chlorides, alkalinity, sodium, calcium, magnesium, sulphates and nitrates are considered for the study. Groundwater quality modelling is attempted by using MODFLOW/MT3DMS with different scenarios. This study revealed that in all the scenarios the center portion of study area is more affected i.e. from P·N.Palayam to Kalangal. The groundwater flow is moving towards and along the river flow. Hence the pollutants are moving easily from upstream to the downstream side. necessary measures has to be taken to control the groundwater contamination.
Collapse
Affiliation(s)
- M Lenin Sundar
- Department of Civil Engineering, Sri Krishna College of Technology, Coimbatore, 641042, Tamilnadu, India.
| | - S Ragunath
- Department of Civil Engineering, Jansons Institute of Technology, Coimbatore, 641659, Tamilnadu, India.
| | - J Hemalatha
- Department of Agriculture Engineering, SNS College of Technology, Coimbatore, 641035, Tamilnadu, India.
| | - S Vivek
- Department of Civil Engineering, Hindusthan College of Engineering & Technology, Coimbatore, 641032, Tamilnadu, India.
| | - M Mohanraj
- Department of Mechanical Engineering, Hindusthan College of Engineering & Technology, Coimbatore, 641032, Tamilnadu, India.
| | - V Sampathkumar
- Department of Civil Engineering, Kongu Engineering College, Perundurai, 638060, Tamilnadu, India.
| | - A Mohammed Siraj Ansari
- Department of Civil Engineering, Coimbatore Institute of Technology, Coimbatore, 641014, Tamilnadu, India.
| | - V Parthiban
- Department of Civil Engineering, Sri Ramakrishna Engineering College, Coimbatore, 641022, Tamilnadu, India.
| | - S Manoj
- Department of Civil Engineering, Kongu Engineering College, Perundurai, 638060, Tamilnadu, India.
| |
Collapse
|
3
|
Kathayat G, Pokharel DR, Yadav NK, Manoj S. Association of Anthropometric Parameters with Lipid Profile among Adult Population of Kaski District, Nepal. Kathmandu Univ Med J (KUMJ) 2021; 19:429-435. [PMID: 36259184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Background Anthropometric parameters of individuals are good at predicting functional impairment, mortality, and future cardiometabolic diseases. The relationship between anthropometric parameters and lipid profiles have been studied in different parts of the world. But to date, no such studies have been conducted in Nepal. Objective To investigate the association between anthropometric parameters and lipid profile in the adult population of Kaski district, Nepal. Method This study was carried out at Manipal Teaching Hospital, Pokhara, Kaski, Nepal. The fasting lipid profiles were analyzed in a total of 400 subjects aged > 18 years with an automated OCD Vitros 350 dry chemistry analyzer. The Kolmogorov-Smirnov test was used to test the normality of the data. The mean values of fasting lipids were compared within the subjects with different body mass index groups using ANOVA and waist circumference, waist-hip ratios, waist-height ratios, and neck circumference using independent samples t-test. The anthropometric indices evaluated were body mass index, waist circumference, waist-hip ratio, waist-height ratio, head circumference, neck circumference, and mid-upper arm circumference. Pearson's correlation coefficients and multiple regression analysis were performed to identify the association between the lipid profile and anthropometric parameters. The difference was considered statistically significant when p values (two-tailed) were < 0.050. Result The mean values of the serum lipid parameters other than high-density lipoprotein cholesterol were found to be higher in the subjects with an above than normal BMI, waist circumference, waist-hip ratio, waist-height ratio, and neck circumference. Pearson's correlation coefficient and multiple regression analysis showed that waistheight ratio best predicts serum triglycerides (β=0.622, p < 0.001) and high-density lipoprotein cholesterol (β=-0.711, p < 0.001) among all measured anthropometric parameters. Conclusion Among all the studied anthropometric parameters, the WHtR was found to be the most powerful predictor of serum triglycerides and high-density lipoprotein cholesterol.
Collapse
Affiliation(s)
- G Kathayat
- Department of Biochemistry, Manipal College of Medical Sciences and Teaching Hospital, Pokhara, Nepal
| | - D R Pokharel
- Department of Biochemistry, Manipal College of Medical Sciences and Teaching Hospital, Pokhara, Nepal
| | - N K Yadav
- Department of Biochemistry, Manipal College of Medical Sciences and Teaching Hospital, Pokhara, Nepal
| | - S Manoj
- Department of Biochemistry, Manipal College of Medical Sciences and Teaching Hospital, Pokhara, Nepal
| |
Collapse
|
4
|
Manoj S, RamyaPriya R, Elango L. Long-term exposure to chromium contaminated waters and the associated human health risk in a highly contaminated industrialised region. Environ Sci Pollut Res Int 2021; 28:4276-4288. [PMID: 32935216 DOI: 10.1007/s11356-020-10762-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 09/07/2020] [Indexed: 06/11/2023]
Abstract
Disposal of industrial waste is of great concern because it releases toxic metals resulting into the degradation of environments and consequently causes health effects on humans. The present study was carried out with the objectives of identifying the possible source and migration of contaminants in the surface water and groundwater and the associated health risks in the industrial region of Ranipet, Tamil Nadu, India. A total of 22 water samples were collected and analysed for the concentration of major ions and trace elements. Chemical speciation of chromium and lead in surface and groundwater was calculated using the geochemical code, PHREEQC. The concentration of total dissolved solids, chromium and lead was high in the surface water than groundwater in this region. The chromium in most of the sampled water is dominated with Cr(OH)2+ and Cr(OH)3 species and the dominant species of lead was PbCO3. The major source of contamination is the waste dumped in this region and also the improper disposal of effluents from the small-scale industries in this region. Use of groundwater with the present level of chromium and lead in this region will cause several health effects through oral and dermal pathways. Hence, stringent monitoring of quality of water sources of this region, enforcement of regulation of the disposal of wastes from the industries, recover and treat the dumped solid waste are very much necessary to prevent the spread of contamination.
Collapse
Affiliation(s)
- S Manoj
- Department of Geology, Anna University, Chennai, Tamil Nadu, 600025, India
| | - R RamyaPriya
- Department of Geology, Anna University, Chennai, Tamil Nadu, 600025, India
| | - L Elango
- Department of Geology, Anna University, Chennai, Tamil Nadu, 600025, India.
| |
Collapse
|
5
|
Manoj S, Thirumurugan M, Elango L. Determination of distribution coefficient of uranium from physical and chemical properties of soil. Chemosphere 2020; 244:125411. [PMID: 32050322 DOI: 10.1016/j.chemosphere.2019.125411] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 10/29/2019] [Accepted: 11/18/2019] [Indexed: 06/10/2023]
Abstract
Uranium is a long lived radioactive element which is naturally present in minute concentrations in igneous, sedimentary and metamorphic rocks. These rocks when subjected to weathering results in the formation of soil which also has traces of uranium. Distribution coefficient (Kd) is a crucial parameter in environmental assessment which is used to predict the interaction and transport of uranium in groundwater. The objective of the study is to estimate the Kd of uranium in soils and to develop a relation between this and the soil parameters. Seven rock samples and twenty three soil samples were collected during this study. The Kd of rock samples of different grain sizes where determined and the soil samples were analysed for electrical conductivity, pH, grain size, bulk density, particle density, porosity, calcium carbonate, cation exchange capacity and Kd. The Kd of the soil increases with increase in soil pH up to 6, after which it gradually decreases. Multiple regression analysis was performed to quantify the effect of various soil parameters on soil Kd and equations were statistically significant. Thus, soil Kd in a region could be predicted using limited soil properties with such statistically significant equations.
Collapse
Affiliation(s)
- S Manoj
- Department of Geology, Anna University, Chennai, 600 025, Tamil Nadu, India.
| | - M Thirumurugan
- Department of Geology, Anna University, Chennai, 600 025, Tamil Nadu, India.
| | - L Elango
- Department of Geology, Anna University, Chennai, 600 025, Tamil Nadu, India.
| |
Collapse
|
6
|
Manoj S, Moore Z, Patton D, O'Connor T, Nugent LE. The impact of a nurse‐led elective direct current cardioversion in atrial fibrillation on patient outcomes: A systematic review. J Clin Nurs 2019; 28:3374-3385. [DOI: 10.1111/jocn.14852] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2018] [Revised: 03/14/2019] [Accepted: 03/21/2019] [Indexed: 11/29/2022]
Affiliation(s)
- Sunitha Manoj
- Coronary Care Unit Connolly Hospital Blanchardstown, Dublin Ireland
| | - Zena Moore
- Royal College of Surgeons in Ireland School of Nursing and Midwifery Dublin Ireland
| | - Declan Patton
- Royal College of Surgeons in Ireland School of Nursing and Midwifery Dublin Ireland
| | - Tom O'Connor
- Royal College of Surgeons in Ireland School of Nursing and Midwifery Dublin Ireland
| | - Linda E. Nugent
- Royal College of Surgeons in Ireland School of Nursing and Midwifery Dublin Ireland
| |
Collapse
|
7
|
Jain S, Nair U, Manoj S, Nambiar R. Correlation between the health of the cone outer segment tips line and ellipsoid zone with vision after macular hole surgery. Kerala J Ophthalmol 2016. [DOI: 10.4103/0976-6677.193878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
|
8
|
Abstract
BACKGROUND Rabies is a zoonosis transmitted via the bites of various mammals, primarily dogs and bats. Known since antiquity, this disease may have the deadliest human fatality rates and is responsible for approximately 65,000 deaths worldwide per year. CASE PRESENTATION We report the case details of a 13-year-old boy from India belonging to a South Asian ethnicity, who presented with altered sensorium one month following a dog bite. He did not receive the active rabies immunization and was managed with supportive therapy. The patient had extensive T2W (T2 weighted)/fluid attenuation and inversion recovery (FLAIR) hyper intensities involving the deep gray matter of the cerebral hemispheres, hippocampus, brainstem, and cerebellum. The diagnosis was confirmed by the demonstration of the rabies antigen from a nuchal skin biopsy and a corneal smear. The patient had a slow but significant recovery over four months and was discharged from the hospital in stable condition with severe neurological sequelae. CONCLUSION We report a unique case of survival after infection with a universally fatal disease.
Collapse
Affiliation(s)
- S Manoj
- Department of Neurology, Army Hospital (R&R), New Delhi, 110011 India
| | - A Mukherjee
- Department of Neurology, Command Hospital, Lucknow, 226002 India
| | - S Johri
- Department of Neurology, Command Hospital, Lucknow, 226002 India
| | - K V S Hari Kumar
- Department of Endocrinology, Command Hospital, Chandimandir, 134107 India
| |
Collapse
|
9
|
|
10
|
Nambiar R, Manoj S, Nair U, Jain S. Tomographic features of idiopathic polypoidal choroidal vasculopathy using spectral domain OCT. Kerala J Ophthalmol 2016. [DOI: 10.4103/kjo.kjo_35_16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
|
11
|
Bisht YS, Bhasin R, Manoj S, Sunita BS, Singhal E. Becker's nevus syndrome. Med J Armed Forces India 2015; 71:S89-91. [PMID: 26265883 DOI: 10.1016/j.mjafi.2013.04.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2013] [Accepted: 04/22/2013] [Indexed: 11/19/2022] Open
Affiliation(s)
- Y S Bisht
- Senior Advisor (Dermatology), Base Hospital, Lucknow, India
| | - Rohit Bhasin
- Classified Specialist (Dermatology & Venereology), Base Hospital, Lucknow, India
| | - S Manoj
- Classified Specialist (Medicine & Neurology), Command Hospital (Central Command), Lucknow, India
| | - B S Sunita
- Graded Specialist (Pathology), Command Hospital (Central Command), Lucknow, India
| | - Esha Singhal
- Resident (Dermatology & Venereology), Base Hospital, Lucknow, India
| |
Collapse
|
12
|
Narayanan K, Gupta A, Manoj S, Seshadri K. HIV Infection Presenting with Dementia. J Assoc Physicians India 2015; 63:85-86. [PMID: 27604445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We present a case of dementia in a young healthy individual. On evaluation he was detected to have HIV infection with low CD4 count and a high viral load. He had no opportunistic infections or any other AIDS defining illnesses. He recovered fully within 3 months of antiretroviral therapy.
Collapse
Affiliation(s)
| | | | - S Manoj
- Cl Spl Medicine and Neurology
| | - Kp Seshadri
- Cl Spl Psychiatry, Command Hospital (CC), Lucknow, Uttar Pradesh
| |
Collapse
|
13
|
Affiliation(s)
- S Manoj
- Department of Neurology, Command Hospital, Lucknow, Uttar Pradesh, India
| | - Arindam Mukherjee
- Department of Neurology, Command Hospital, Lucknow, Uttar Pradesh, India
| | - K V S Hari Kumar
- Department of Endocrinology, Command Hospital, Panchkula, Haryana, India. E-mail:
| |
Collapse
|
14
|
|
15
|
Kumar KVSH, Shaikh A, Manoj S, Swamy MN. Double whammy after pituitary surgery. Indian J Endocrinol Metab 2013; 17:532-533. [PMID: 23869318 PMCID: PMC3712392 DOI: 10.4103/2230-8210.111682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Affiliation(s)
- K. V. S. Hari Kumar
- Department of Endocrinology, Command Hospital, Lucknow, Uttar Pradesh, India
| | - Altamash Shaikh
- Department of Endocrinology, INDU CLINIC, Royal Terrace, Colaba, Mumbai, India
| | - S. Manoj
- Department of Neurology, Command Hospital, Lucknow, Uttar Pradesh, India
| | - M. N. Swamy
- Department of Neurosurgery, Command Hospital, Lucknow, Uttar Pradesh, India
| |
Collapse
|
16
|
Rose B, Nath S, Manoj S, Simpson D, Yashar C, Mundt A, Mell L. Correlation between Bone Marrow Dose and Acute Hematologic Toxicity in Cervical Cancer Patients Treated with Chemoradiotherapy: Implications for Extended-Field Intensity Modulated Radiation Therapy. Int J Radiat Oncol Biol Phys 2010. [DOI: 10.1016/j.ijrobp.2010.07.942] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
17
|
Ramakrishna NVS, Vishwottam KN, Manoj S, Koteshwara M, Wishu S, Varma DP. Rapid, simple and highly sensitive LC-ESI-MS/MS method for the quantification of tamsulosin in human plasma. Biomed Chromatogr 2006; 19:709-19. [PMID: 15828055 DOI: 10.1002/bmc.498] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A simple, rapid, sensitive and specific liquid chromatography-tandem mass spectrometry method was developed and validated for quantification of tamsulosin (I), a highly selective alpha1-adrenoceptor antagonist used for the treatment of patients with symptomatic benign prostatic hyperplasia. The analyte and internal standard, mosapride (II) were extracted by liquid-liquid extraction with diethyl ether-dichloromethane (70:30, v/v) using a Glas-Col Multi-Pulse Vortexer. The chromatographic separation was performed on a reverse phase Waters symmetry C18 column with a mobile phase of 0.03% formic acid-acetonitrile (30:70, v/v). The protonated analyte was quantitated in positive ionization by multiple reaction monitoring with a mass spectrometer. The mass transitions m/z 409.1 solidus in circle 228.1 and m/z 422.3 solidus in circle 198.3 were used to measure I and II, respectively. The assay exhibited a linear dynamic range of 0.1-50.0 ng/mL for tamsulosin in human plasma. The lower limit of quantitation was 100 pg/mL with a relative standard deviation of less than 10%. Acceptable precision and accuracy were obtained for concentrations over the standard curve ranges. A run time of 2.0 min for each sample made it possible to analyze a throughput of more than 400 human plasma samples per day. The validated method has been successfully used to analyze human plasma samples for application in pharmacokinetic, bioavailability or bioequivalence studies.
Collapse
Affiliation(s)
- N V S Ramakrishna
- Biopharmaceutical Research, Suven Life Sciences Ltd, Serene Chambers, Road 7, Banjara Hills, Hyderabad 500034, India.
| | | | | | | | | | | |
Collapse
|
18
|
Ramakrishna NVS, Vishwottam KN, Koteshwara M, Manoj S, Santosh M, Chidambara J, Sumatha B, Varma DP. Rapid quantification of gabapentin in human plasma by liquid chromatography/tandem mass spectrometry. J Pharm Biomed Anal 2006; 40:360-8. [PMID: 16112830 DOI: 10.1016/j.jpba.2005.07.012] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2005] [Revised: 07/08/2005] [Accepted: 07/08/2005] [Indexed: 10/25/2022]
Abstract
A simple, sensitive and rapid liquid chromatography/tandem mass spectrometry (LC-MS/MS) method was developed and validated for the quantification of gabapentin, a new antiepileptic drug, in human plasma using its structural analogue, 1,1-cyclohexane diacetic acid monoamide (CAM) as internal standard. The method involved a simple protein precipitation by means of acetonitrile followed by a rapid isocratic elution with 10mM ammonium formate buffer/acetonitrile (20/80, v/v, pH 3.0) on Waters Symmetry C(18 reversed phase chromatographic column and analyzed by mass spectrometry in the multiple reaction monitoring mode. The precursor to product ion transitions of m/z 172-->154 and m/z 200-->182 were used to measure the analyte and the IS, respectively. The assay exhibited a linear dynamic range of 40-10000 ng/mL for gabapentin in human plasma. The limit of detection and lower limit of quantification in human plasma were 10 and 40 ng/mL, respectively. Acceptable precision and accuracy were obtained for concentrations over the standard curve ranges. A run time of 2 min for each sample made it possible to analyze a throughput of more than 400 human plasma samples per day. The validated method has been successfully used to analyze human plasma samples for application in pharmacokinetic, bioavailability or bioequivalence studies.
Collapse
Affiliation(s)
- N V S Ramakrishna
- Biopharmaceutical Research, Suven Life Sciences Ltd., Serene Chambers, Road # 7, Banjara Hills, Hyderabad 500034, India.
| | | | | | | | | | | | | | | |
Collapse
|
19
|
Ramakrishna NVS, Vishwottam KN, Manoj S, Koteshwara M, Santosh M, Anjaneyulu Y. Rapid Liquid Chromatographic – Tandem Mass Spectrometric Method for the Quantification of Pentoxifylline in Human Plasma. Chromatographia 2006. [DOI: 10.1365/s10337-005-0704-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
20
|
Ramakrishna NVS, Vishwottam KN, Koteshwara M, Manoj S, Santosh M, Varma DP. Rapid quantification of nebivolol in human plasma by liquid chromatography coupled with electrospray ionization tandem mass spectrometry. J Pharm Biomed Anal 2005; 39:1006-13. [PMID: 16006083 DOI: 10.1016/j.jpba.2005.05.021] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2004] [Revised: 12/15/2004] [Accepted: 05/20/2005] [Indexed: 10/25/2022]
Abstract
A simple, sensitive and rapid liquid chromatographic/electrospray ionization tandem mass spectrometric method was developed and validated for the quantitation of nebivolol in human plasma. The method involved a simple single-step liquid-liquid extraction with diethyl ether/dichloromethane (70/30). The analyte was chromatographed on Waters symmetry C18 reversed-phase chromatographic column by isocratic elution with water:acetonitrile:formic acid (30:70:0.03, v/v) and analyzed by mass spectrometry in the multiple reaction monitoring mode. The precursor to product ion transitions of m/z 406.4-151.5 and m/z 409.1-228.1 were used to measure the analyte and the internal standard (I.S.), respectively. The chromatographic runtime was 2 min and the weighted (1/x2) calibration curves were linear over the range 50-10,000 pg/mL. The method was validated in terms of accuracy, precision, absolute recovery, freeze-thaw stability, bench-top stability and re-injection reproducibility. The limit of detection and lower limit of quantification in human plasma were 10 and 50 pg/mL, respectively. The within- and between-batch accuracy and precision were found to be well within acceptable limits (<10%). The analyte was stable after three freeze-thaw cycles (deviation <10%). The average absolute recoveries of nebivolol and tamsulosin, used as an internal standard, from spiked plasma samples were 73.4+/-3.7 and 72.1+/-2.0%, respectively. The assay method described here was applied to study the pharmacokinetics of nebivolol.
Collapse
Affiliation(s)
- N V S Ramakrishna
- Biopharmaceutical Research, Suven Life Sciences Ltd., Serene Chambers, Road #7, Banjara Hills, Hyderabad 500034, India.
| | | | | | | | | | | |
Collapse
|
21
|
Ramakrishna NVS, Vishwottam KN, Puran S, Koteshwara M, Manoj S, Santosh M, Chidambara J, Wishu S, Sumatha B. Quantitation of tadalafil in human plasma by liquid chromatography-tandem mass spectrometry with electrospray ionization. J Chromatogr B Analyt Technol Biomed Life Sci 2005; 809:243-9. [PMID: 15315772 DOI: 10.1016/j.jchromb.2004.06.026] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2004] [Revised: 06/16/2004] [Accepted: 06/16/2004] [Indexed: 09/30/2022]
Abstract
A simple, rapid, sensitive and specific liquid chromatography-tandem mass spectrometry method was developed and validated for quantitation of tadalafil (I) in human plasma, a new selective, reversible phosphodiesterase 5 inhibitor. The analyte and internal standard (sildenafil, II) were extracted by liquid-liquid extraction with diethyl ether/dichloromethane (70/30, v/v) using a Glas-Col Multi-Pulse Vortexer. The chromatographic separation was performed on reverse phase Xterra MS C18 column with a mobile phase of 10mM ammonium formate/acetonitrile (10/90, v/v, pH adjusted to 3.0 with formic acid). The protonate of analyte was quantitated in positive ionization by multiple reaction monitoring with a mass spectrometer. The mass transitions m/z 390.4 --> 268.0 and m/z 475.5 --> 58.3 were used to measure I and II, respectively. The assay exhibited a linear dynamic range of 10-1000 ng/mL for tadalafil in human plasma. The lower limit of quantitation was 10 ng/mL with a relative standard deviation of less than 15%. Acceptable precision and accuracy were obtained for concentrations over the standard curve ranges. Run time of 1.2 min for each sample made it possible to analyze a throughput of more than 400 human plasma samples per day. The validated method has been successfully used to analyze human plasma samples for application in pharmacokinetic, bioavailability or bioequivalence studies.
Collapse
Affiliation(s)
- N V S Ramakrishna
- Biopharmaceutical Research, Suven Life Sciences Ltd., Serene Chambers, Road #7, Banjara Hills, Hyderabad 500034, India.
| | | | | | | | | | | | | | | | | |
Collapse
|
22
|
Ramakrishna NVS, Vishwottam KN, Manoj S, Koteshwara M, Chidambara J, Varma DP. Validation and application of a high-performance liquid chromatography-tandem mass spectrometry assay for mosapride in human plasma. Biomed Chromatogr 2005; 19:539-48. [PMID: 15654725 DOI: 10.1002/bmc.477] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A simple, rapid, sensitive and specific liquid chromatography-tandem mass spectrometry method was developed and validated for quantification of mosapride (I), a novel and potent gastroprokinetic agent that enhances the upper gastrointestinal motility by stimulating 5-HT(4) receptor. The analyte and internal standard, tamsulosin (II), were extracted by liquid-liquid extraction with diethyl ether-dichloromethane (70:30, v/v) using a Glas-Col Multi-Pulse Vortexer. The chromatographic separation was performed on a reversed-phase Waters symmetry C(18) column with a mobile phase of 0.03% formic acid-acetonitrile (10:90, v/v). The protonated analyte was quantitated in positive ionization by multiple reaction monitoring with a mass spectrometer. The mass transitions m/z 422.3 -->198.3 and m/z 409.1 -->228.1 were used to measure I and II, respectively. The assay exhibited a linear dynamic range of 0.5-100.0 ng/mL for mosapride in human plasma. The lower limit of quantitation was 500 pg/mL with a relative standard deviation of less than 15%. Acceptable precision and accuracy were obtained for concentrations over the standard curve ranges. A run time of 2.0 min for each sample made it possible to analyze a throughput of more than 400 human plasma samples per day. The validated method has been successfully used to analyze human plasma samples for application in pharmacokinetic, bioavailability or bioequivalence studies.
Collapse
Affiliation(s)
- N V S Ramakrishna
- Biopharmaceutical Research, Suven Life Sciences Ltd, Serene Chambers, Road 7, Banjara Hills, Hyderabad 500034, India.
| | | | | | | | | | | |
Collapse
|
23
|
Ramakrishna NVS, Vishwottam KN, Manoj S, Koteshwara M, Wishu S, Varma DP. Sensitive liquid chromatography-tandem mass spectrometry method for quantification of hydrochlorothiazide in human plasma. Biomed Chromatogr 2005; 19:751-60. [PMID: 15856489 DOI: 10.1002/bmc.510] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
A simple, rapid, sensitive and specific liquid chromatography-tandem mass spectrometry method was developed and validated for quantification of hydrochlorothiazide (I), a common diuretic and anti-hypertensive agent. The analyte and internal standard, tamsulosin (II) were extracted by liquid-liquid extraction with diethyl ether-dichloromethane (70:30, v/v) using a Glas-Col Multi-Pulse Vortexer. The chromatographic separation was performed on a reversed-phase column (Waters symmetry C18) with a mobile phase of 10 mm ammonium acetate-methanol (15:85, v/v). The protonated analyte was quantitated in negative ionization by multiple reaction monitoring with a mass spectrometer. The mass transitions m/z 296.1 solidus in circle 205.0 and m/z 407.2 solidus in circle 184.9 were used to measure I and II, respectively. The assay exhibited a linear dynamic range of 0.5-200 ng/mL for hydrochlorothiazide in human plasma. The lower limit of quantitation was 500 pg/mL, with a relative standard deviation of less than 9%. Acceptable precision and accuracy were obtained for concentrations over the standard curve ranges. A run time of 2.5 min for each sample made it possible to analyze a throughput of more than 400 human plasma samples per day. The validated method has been successfully used to analyze human plasma samples for application in pharmacokinetic, bioavailability or bioequivalence studies.
Collapse
Affiliation(s)
- N V S Ramakrishna
- Biopharmaceutical Research, Suven Life Sciences Ltd, Serene Chambers, Road 7, Banjara Hills, Hyderabad 500034, India.
| | | | | | | | | | | |
Collapse
|
24
|
Ramakrishna NVS, Vishwottam KN, Manoj S, Koteshwara M, Santosh M, Chidambara J, Kumar BR. Liquid chromatography/electrospray ionization mass spectrometry method for the quantification of valproic acid in human plasma. Rapid Commun Mass Spectrom 2005; 19:1970-8. [PMID: 15954179 DOI: 10.1002/rcm.2012] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
A simple, sensitive and rapid liquid chromatography/electrospray ionization mass spectrometry (LC/ESI-MS) method was developed and validated for the quantification of valproic acid, an antiepileptic drug, in human plasma using benzoic acid as internal standard (IS). Following solid-phase extraction, the analytes were separated using an isocratic mobile phase on a reversed-phase C18 column and analyzed by MS in the single ion monitoring mode using the respective [M-H]- ions, m/z 143 for valproic acid and m/z 121 for the IS. The assay exhibited a linear dynamic range of 0.5-60 microg/mL for valproic acid in human plasma. The lower limit of quantification was 500 ng/mL with a relative standard deviation of less than 10%. Acceptable precision and accuracy were obtained for concentrations over the standard curve range. The average absolute recoveries of valproic acid and the IS from spiked plasma samples were 96.1+/-4.2 and 95.6+/-2.7%, respectively. A run time of 4.5 min for each sample made it possible to analyze more than 250 human plasma samples per day. The validated method has been successfully used to analyze human plasma samples for application in pharmacokinetic, bioavailability and bioequivalence studies.
Collapse
Affiliation(s)
- N V S Ramakrishna
- Biopharmaceutical Research, Suven Life Sciences Ltd., Serene Chambers, Road # 7, Banjara Hills, Hyderabad 500034, India.
| | | | | | | | | | | | | |
Collapse
|
25
|
Ramakrishna NVS, Koteshwara M, Vishwottam KN, Puran S, Manoj S, Santosh M. Simple, sensitive and rapid LC–MS/MS method for the quantitation of cerivastatin in human plasma — application to pharmacokinetic studies. J Pharm Biomed Anal 2004; 36:505-15. [PMID: 15522524 DOI: 10.1016/j.jpba.2004.06.022] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2004] [Revised: 06/21/2004] [Accepted: 06/24/2004] [Indexed: 12/14/2022]
Abstract
A simple and sensitive liquid chromatography-tandem mass spectrometry method was developed and validated for estimation of cerivastatin (I) in human plasma, a potent hydroxy-methylglutaryl-coenzyme A reductase inhibitor. The analyte and internal standard (atorvastatin, II) were extracted by liquid/liquid extraction with diethyl ether/dichloromethane (70/30, v/v). The chromatographic separation was performed on reverse phase Xterra ODS column with a mobile phase of water/acetonitrile (30/70, v/v) with 0.03% formic acid. The protonated analyte was quantitated in positive ionization by multiple reaction monitoring with a mass spectrometer. The mass transitions m/z 460.4 --> 356.3 and 559.2 --> 440.3 were used to measure I and II, respectively. The lower limit of quantitation was 10pg/mL with a relative standard deviation of less than 15%. Acceptable precision and accuracy were obtained for concentrations over the calibration curve ranges (0.01-10ng/mL). Sample analysis time of 2min for each sample made it possible to analyze a throughput of more than 400 human plasma samples per day. The assay can be used to analyze human plasma samples to support phase I and II clinical studies.
Collapse
Affiliation(s)
- N V S Ramakrishna
- Biopharmaceutical Research, Suven Life Sciences Ltd., Serene Chambers, Road #7, Banjara Hills, Hyderabad 500034, India.
| | | | | | | | | | | |
Collapse
|
26
|
Ramakrishna NVS, Vishwottam KN, Puran S, Koteshwara M, Manoj S, Santosh M. Selective and rapid liquid chromatography–tandem mass spectrometry assay of dutasteride in human plasma. J Chromatogr B Analyt Technol Biomed Life Sci 2004; 809:117-24. [PMID: 15282101 DOI: 10.1016/j.jchromb.2004.06.010] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2004] [Revised: 05/10/2004] [Accepted: 06/08/2004] [Indexed: 10/26/2022]
Abstract
A simple, rapid, sensitive and specific liquid chromatography-tandem mass spectrometry method was developed and validated for quantification of dutasteride (I), a potent and the first specific dual inhibitor of 5alpha-reductase, in human plasma. The analyte and internal standard (finasteride (II)) were extracted by liquid-liquid extraction with diethyl ether/dichloromethane (70/30, v/v) using a Glas-Col Multi-Pulse Vortexer. The chromatographic separation was performed on a reverse phase Xterra MS C18 column with a mobile phase of 10 mM ammonium formate/acetonitrile (15/85, v/v, pH adjusted to 3.0 with formic acid). The protonated analyte was quantitated in positive ionization by multiple reaction monitoring with a mass spectrometer. The mass transitions m/z 529.5 --> 461.5 and m/z 373.3 --> 317.4 were used to measure I and II, respectively. The assay exhibited a linear dynamic range of 0.1-25.0 ng/mL for dutasteride in human plasma. The lower limit of quantitation was 100 pg/mL with a relative standard deviation of less than 15%. Acceptable precision and accuracy were obtained for concentrations over the standard curve ranges. A run time of 1.2 min for each sample made it possible to analyze a throughput of more than 400 human plasma samples/day. The validated method has been successfully used to analyze human plasma samples for application in pharmacokinetic, bioavailability or bioequivalence studies.
Collapse
Affiliation(s)
- N V S Ramakrishna
- Biopharmaceutical Research, Suven Life Sciences Ltd., Serene Chambers, Road # 7, Banjara Hills, Hyderabad 500034, India.
| | | | | | | | | | | |
Collapse
|
27
|
Ramakrishna NVS, Vishwottam KN, Puran S, Manoj S, Santosh M, Koteshwara M. Simple, sensitive and rapid liquid chromatographic/electrospray ionization tandem mass spectrometric method for the quantification of lacidipine in human plasma. J Mass Spectrom 2004; 39:824-832. [PMID: 15282762 DOI: 10.1002/jms.664] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A simple, sensitive and rapid liquid chromatographic/electrospray ionization tandem mass spectrometric method was developed and validated for the quantification of lacidipine in human plasma using its structural analogue, amlodipine, as internal standard (IS). The method involves a simple single-step liquid-liquid extraction with tert-butyl methyl ether. The analyte was chromatographed on an Xterra MS C(18) reversed-phase chromatographic column by isocratic elution with 20 mM ammonium acetate buffer-acetonitrile (10:90, v/v; pH 6) and analyzed by mass spectrometry in the multiple reaction monitoring mode. The precursor to product ion transitions of m/z 456.4 --> 354.4 and m/z 409.3 --> 238.3 were used to measure the analyte and the I.S., respectively. The chromatographic run time was 1.5 min and the weighted (1/x(2)) calibration curves were linear over the range 0.1-25 ng ml(-1). Lacidipine was sensitive to temperature in addition to light. The method was validated in terms of accuracy, precision, absolute recovery, freeze-thaw stability, bench-top stability and re-injection reproducibility. The limit of detection and lower limit of quantification in human plasma were 50 and 100 pg ml(-1), respectively. The within- and between-batch accuracy and precision were found to be well within acceptable limits (<15%). The analyte was stable after three freeze-thaw cycles (deviation <15%). The average absolute recoveries of lacidipine and amlodipine (IS) from spiked plasma samples were 51.1 +/- 1.3 and 50.3 +/- 4.9%, respectively. The assay method described here could be applied to study the pharmacokinetics of lacidipine.
Collapse
Affiliation(s)
- N V S Ramakrishna
- Biopharmaceutical Research, Suven Life Sciences Ltd, Serene Chambers, Road # 7, Banjara Hills, Hyderabad 500034, India.
| | | | | | | | | | | |
Collapse
|
28
|
Ramakrishna NVS, Vishwottam KN, Puran S, Manoj S, Santosh M, Wishu S, Koteshwara M, Chidambara J, Gopinadh B, Sumatha B. Liquid chromatography–negative ion electrospray tandem mass spectrometry method for the quantification of tacrolimus in human plasma and its bioanalytical applications. J Chromatogr B Analyt Technol Biomed Life Sci 2004; 805:13-20. [PMID: 15113534 DOI: 10.1016/j.jchromb.2004.02.002] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2003] [Revised: 01/26/2004] [Accepted: 02/02/2004] [Indexed: 11/18/2022]
Abstract
A simple, rapid, novel and sensitive liquid chromatography-tandem mass spectrometry method was developed and validated for quantification of tacrolimus (I) in human plasma, a narrow therapeutic index, potent macrolide immunosuppressive drug. The analyte and internal standard (tamsulosin (II)) were extracted by liquid-liquid extraction with t-butylmethylether using a Glas-Col Multi-Pulse Vortexer. The chromatographic separation was performed on reverse phase Xterra ODS column with a mobile phase of 99% methanol and 1% 10mM ammonium acetate buffer. The deprotonate of analyte was quantitated in negative ionization by multiple reaction monitoring (MRM) with a mass spectrometer. The mass transitions m/z 802.5-->560.3 and m/z 407.2-->151.9 were used to measure I and II, respectively. The assay exhibited a linear dynamic range of 0.05-25ng/ml for tacrolimus in human plasma. The lower limit of quantitation was 50pg/ml with a relative standard deviation of less than 20%. Acceptable precision and accuracy were obtained for concentrations over the standard curve ranges. Run time of 2min for each sample made it possible to analyze a throughput of more than 400 human plasma samples per day. The validated method has been successfully used to analyze human plasma samples for application in comparative bioavailability studies. The tacrolimus plasma concentration profile could be obtained for pharmacokinetic study. The observed maximum plasma concentration (C(max)) of tacrolimus (5mg oral dose) is 440pg/ml, time to observed maximum plasma concentration (T(max)) is 2.5h and elimination half-life (T(1/2)) is 21h.
Collapse
Affiliation(s)
- N V S Ramakrishna
- Biopharmaceutical Research, Suven Life Sciences Ltd., Serene Chambers, Hyderabad 500 034, India.
| | | | | | | | | | | | | | | | | | | |
Collapse
|