Search Results/Filters    

Filters

Year

Banks



Expert Group










Full-Text


Author(s): 

MEDI B. | Kazi m.k.

Issue Info: 
  • Year: 

    2018
  • Volume: 

    15
  • Issue: 

    4
  • Pages: 

    81-92
Measures: 
  • Citations: 

    0
  • Views: 

    152
  • Downloads: 

    117
Abstract: 

In this work, an improved single-COLUMN CHROMATOGRAPHIC (ISCC) separation process is proposed. The term “ improved” represents both conceptual and physical modifications compared to the available single-COLUMN processes, including a novel fraction collection scheme and allowing overlapped peaks from adjacent cycles. In addition, the fraction collection mechanism was modified in order to facilitate online monitoring. Another advantage of the ISCC process is that its large degree of freedom as injection volume, cycle time, solvent flow rate, feed concentration, and fraction-collection intervals can all be decision variables in this process. The experimental implementation and validation are covered in this work. The results indicate the successful operation of the ISCC process and accompanying peripherals for the separation of guaifenesin enantiomers. In particular, the tests confirmed the integrity of the online monitoring system and proved the capability of the process for 98 % purification of the tested enantiomers with an advantageously shorter cycle time, resulting in higher productivity.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 152

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 117 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Issue Info: 
  • Year: 

    2009
  • Volume: 

    12
  • Issue: 

    1 (41)
  • Pages: 

    25-32
Measures: 
  • Citations: 

    0
  • Views: 

    434
  • Downloads: 

    454
Abstract: 

Objective(s): A sensitive liquid CHROMATOGRAPHIC method for the analysis of clarithromycin- a macrolide antibiotic- in human serum, using pre-COLUMN derivatization with 9-fluorenylmethyl chloroformate (FMOC-Cl) is described.Materials and Methods: The method involved liquid - liquid extraction of the drug and an internal standard (amantadine) followed by pre-COLUMN derivatization of the analytes with FMOC-Cl. A mixture of 0.05 M phosphate buffer containing triethylamine (2 ml/l; pH 3.8) and methanol (17:83, v/v) was used as mobile phase and CHROMATOGRAPHIC separation was achieved on a Shimpack CLC-ODS COLUMN. The eluate was monitored by a fluorescence detector with respective excitation and emission wavelengths of 265 and 315 nm.Results: The analytical method was linear over the concentration range of 0.025-10 mg/ml of clarithromycin in human serum with a limit of quantification of 0.025 mg/ml. The assay is sensitive enough to measure drug levels obtained in human single dose studies.Conclusion: In the present method, sensitivity and the running time of analysis have been improved and successfully applied in a bioequivalence study of three different clarithromycin preparations in 12 healthy volunteers.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 434

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 454 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Journal: 

BIOCHEMISTRY

Issue Info: 
  • Year: 

    1984
  • Volume: 

    23
  • Issue: 

    -
  • Pages: 

    1037-1042
Measures: 
  • Citations: 

    1
  • Views: 

    103
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 103

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 1 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Issue Info: 
  • Year: 

    2025
  • Volume: 

    24
  • Issue: 

    138
  • Pages: 

    121-148
Measures: 
  • Citations: 

    0
  • Views: 

    48
  • Downloads: 

    0
Abstract: 

Epilepsy is one of the most common neurological diseases characterized by random seizures that can lead to other health problems. For patients who need emergency treatment, this has many cognitive, psychological and neurological effects. This disease requires long-term treatment and can limit a person's activities. Epilepsy can cause cognitive impairment or worsen existing disabilities. Several factors, including neuropsychology, seizure type, seizure onset age, and psychosocial issues are involved in these injuries. Discovery of drug toxicity is essential for different categories of drugs, including cardiovascular drugs, antibiotics, anticonvulsants, and anticancer drugs. Administering normal therapeutic doses of antiepileptic drugs in the body can lead to inappropriate levels of this drug in human blood. There is a significant relationship between the concentration of the drug in the blood and its effectiveness, and knowing this relationship is very useful in providing treatment strategies. Therefore, it seems necessary to measure the amount of these drugs in biological samples such as human blood serum and body fluids, industrial wastewater, environmental samples and water in order to control and trace them. Today, by nanotechnology, very small amounts of drugs can be measured in different samples. Thus, the paper examines the use of nanotechnology to preparation of suitable adsorbents for the separation of antiepileptic drugs such as benzodiazepine, valproic acid, phenytoin, oxcarbazepine., carbamazepine and lamotrigine using CHROMATOGRAPHIC techniques as well as detection of the drugs in real samples.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 48

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Issue Info: 
  • Year: 

    2021
  • Volume: 

    8
  • Issue: 

    4
  • Pages: 

    31-36
Measures: 
  • Citations: 

    0
  • Views: 

    69
  • Downloads: 

    91
Abstract: 

Background and objective: Wallflower oil is made from the flowers of Erysimum cheiri (L. ) Crantz which is a herb rich in cardenolide compounds. Wallflower oil was traditionally indicated for analgesic, anti-inflammatory, hair tonic, and wound healing purposes. In this paper, wallflower oil was prepared based on the method cited in Persian medicine resources. Methods: To prepare the oil, 250 g dried flower was soaked in 5000 g distilled water for 20 h. Then, it was boiled for 2 h till half of the water volume evaporated. The obtained decoction was filtered and boiled in 2500 g sesame oil until all the aqueous part evaporated. The quality control tests were performed. Results: Acid, peroxide, iodine, and saponification values were determined as 0. 72± 0. 02 (oleic acid%), 7. 16± 0. 10 (meq/kg oil), 104. 73± 0. 71 (g of I2/100 g oil), and 242. 85± 0. 29 (mg KOH/g oil), respectively. HPTLC analysis revealed the presence of cardenolide compounds in wallflower oil, decoction, maceration, and flower samples. GC-FID results recognized linoleic acid (42. 91%), oleic acid (41. 22%), and palmitic acid (9. 76%) as major fatty acids of wallflower oil. In addition, GC-MS study identified 11 volatile compounds among which, thymol (28. 13%), carvacrol (21. 63%), and dodecane (11. 50%) were recognized as the main components. Conclusion: Thymol and carvacrol could be used for evaluation and determination of wallflower oil. On the other hand, presence of cardenolides in wallflower oil and consequent probable cardiac actions should be considered during clinical administrations. This paper recommends further in vitro and in vivo studies as well as clinical trials to evaluate the safety and efficacy of wallflower oil.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 69

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 91 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Issue Info: 
  • Year: 

    2023
  • Volume: 

    42
  • Issue: 

    4
  • Pages: 

    1183-1191
Measures: 
  • Citations: 

    0
  • Views: 

    50
  • Downloads: 

    1
Abstract: 

Favipiravir is a broad-spectrum antiviral drug and it has increasing interest regarding its potential use in Covid-19 therapy.  In the present work, a simple, fast, precise Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC) technique was developed for the quantification of favipiravir (FVP) from pharmaceutical formulation. Moreover, the spectral and CHROMATOGRAPHIC behavior of FVP was investigated. The developed method was performed using an ACE 5 C18 COLUMN (250 mm × 4.6 mm, 5 µm), with the mobile phase composition 10 mM phosphate buffer (pH = 2.5): methanol (80:20, v/v) at a flow rate 0.6 mL/min. The method validation parameters, such as linearity, precision, accuracy, and robustness, were determined. The recovery yields for accuracy were between 99.9 and 101.4 % for three concentrations. The linearity range was determined between 0.5 and 100 µg/mL with a regression coefficient (R2) 0.99998. The limit of detection and limit of quantification values were evaluated as 0.02 µg/mL and 0.05 µg/mL, respectively. The precision of the method was evaluated in inter-day and intra-day precision studies with a relative standard deviation of less than 2%. The method's robustness was investigated using the alteration of flow rate, detection wavelength, and mobile phase ratio.  Moreover, the effect of the pH and mobile phase ratio on the capacity factors was analyzed and the pKa value of the FVP was determined CHROMATOGRAPHICally as 5.03 ± 0.02.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 50

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 1 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Journal: 

Issue Info: 
  • Year: 

    2004
  • Volume: 

    16
  • Issue: 

    4 (61 IN ANIMAL AND FISHERIES SCIENCES)
  • Pages: 

    65-70
Measures: 
  • Citations: 

    0
  • Views: 

    1058
  • Downloads: 

    0
Abstract: 

An HPLC method using immunoaffmity COLUMN cleanup and post-COLUMN electrochemical derivatization with fluorescence detection was developed for the quantitation of aflatoxin residues in shrimp muscle. The shrimp homogenate (50 g) is extracted with methanol: Water (80%), and the extract was defatted with hexane, and the aflatoxins were partitioned into methanol: water. The extract wan diluted by water, and the solution is passed through an immunoaffinity. Aflatoxins subsequently eluted and were detected using an HPLC with Fluorescence detection. Mean recoveries offlatoxins (Bl, B2, G1 G2) from tissue directly fortified at 1.25, 2.5,5,10 and 20 ppb, were over 87% (ranged from 87.7 to 112 %). The within laboratory relative standard deviations [RSDr] were less than 16.6% (ranged from 4.3 to 16.6%). Subsequently 47 samples of shrimp were collected from the southern provinces of Iran and were analyzed for the presence of and aflatoxins B1, B2, G1, and G2. Aflatoxin B2 contamination only detected in one sample at a level of 1.71 ppb. Such a low contamination level may pose a negligible risk to human health.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 1058

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Writer: 

VOSOUGH MARYAM

Issue Info: 
  • Year: 

    2015
  • Volume: 

    5
Measures: 
  • Views: 

    114
  • Downloads: 

    68
Abstract: 

WITH THE INCREASE IN THE COMPLEXITY OF ANALYTICAL OBJECTS, SOPHISTICATION IN ANALYTICAL INSTRUMENTATION HAS ALSO BEEN ENHANCED. ...

Yearly Impact:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 114

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 68
Author(s): 

ZHAO B. | HU H. | NIYOGI S.

Issue Info: 
  • Year: 

    2001
  • Volume: 

    123
  • Issue: 

    -
  • Pages: 

    11673-11677
Measures: 
  • Citations: 

    1
  • Views: 

    165
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 165

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 1 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Writer: 

VOSOOGH MARYAM

Issue Info: 
  • Year: 

    2011
  • Volume: 

    3
Measures: 
  • Views: 

    181
  • Downloads: 

    94
Keywords: 
Abstract: 

HYPHENATED CHROMATOGRAPHIC SYSTEMS SUCH AS HPLC-DAD, GC-MS AND LC-MS ARE BEING EXTENSIVELY USED FOR DETECTION, QUANTIFICATION AND/OR IDENTIFICATION OF COMPOUNDS IN SAMPLES SUCH AS BIOLOGICAL, ENVIRONMENTAL AND FOOD SAMPLES.HOWEVER, THESE SAMPLES ARE TYPICALLY HAVE A COMPLEX NATURE AND THIS POSES PROBLEMS (SUCH AS BASELINE DRIFT, CO-ELUTION AND OVERLAPPING, PEAK SHIFT BETWEEN SAMPLES AND LOW SIGNAL-TO-NOISE RATIOS) FOR THE TRADITIONAL APPROACHES FOR HANDLING SUCH DATA. ALSO THE NEED FOR REDUCING THE ANALYTICAL TIME THROUGH FAST CHROMATOGRAPHIC RUNS HAS ADDED MORE ANALYTICAL CHALLENGES FOR COMPLEX SAMPLES, TOO. MATRIX EFFECT AS THE MOST IMPORTANT PROBLEM FOR ANALYSIS OF THESE SAMPLES HAS BEEN FACED WHEN THE SAMPLE PREPARATION STEPS ARE NOT SELECTIVE ENOUGH FOR TARGET ANALYTES AND ALSO THE RESOLUTION OF THE ELUTING COMPOUNDS IS NOT PERFECT, TOO. THROUGH RECENT DECADES MANY RESEARCH GROUPS HAVE BEEN USED MORE ELABORATE STRATEGIES SUCH AS SELECTIVE EXTRACTION, EFFECTIVE SAMPLE CLEAN-UP, IMPROVING THE CHROMATOGRAPHIC SEPARATION AND SUITABLE CALIBRATION APPROACHES, E.G., THE USE OF MATRIX-MATCHED STANDARDS TO COMPENSATE THE MATRIX EFFECT [1-3]. HOWEVER, MANY OF THESE STRATEGIES MAY BE TIME-CONSUMING AND SHOULD BE SPECIFIC FOR EACH REAL SAMPLE THROUGH THIS FACT THAT THE INTERFERENCE EFFECT IS COMPLETELY MATRIX DEPENDENT. IN FACT, IN MANY SITUATIONS ALTHOUGH THE ENRICHMENT AND CLEAN-UP STEPS WERE CAREFULLY OPTIMIZED, THE SAMPLE MATRIX STILL CAUSED A LARGE BASELINE DRIFT, AND ALSO ADDITIVE INTERFERENCES WERE PRESENT AT THE RETENTION TIME REGION OF THE ANALYTES.MULTIWAY CALIBRATION METHODS SUCH AS GRAM, PARAFAC, PARAFAC2, ATLD, SWATLD, TUCKER3, MCR-ALS, U-PLS/RBL, N-PLS/RBL AND ANN/RBL WITH EXPLOITING SECOND-ORDER ADVANTAGE HAVE BEEN USEFUL ALTERNATIVES FOR DETECTION AND QUANTIFICATION OF ANALYTES IN COMPLEX REAL SAMPLES AND IN THE PRESENCE OF UNCALIBRATED AND UNKNOWN INTERFERENCES [1]. SO THESE TECHNIQUES CAN BE VERY USEFUL AND PROMISING TOOLS TO ENHANCE THE ANALYTICAL PERFORMANCE OF CHROMATOGRAPHIC SYSTEMS. IN THIS WAY, THE MOST COMMON THREE-WAY TECHNIQUES AND RECENTLY DEVELOPED STRATEGIES USED IN SECOND-ORDER CALIBRATION FOR HYPHENATED CHROMATOGRAPHIC DATA AND SOME NECESSARY SIGNAL-PRETREATMENT STEPS WITH A FOCUS ON OUR RESEARCH WORKS IS DEMONSTRATED.

Yearly Impact:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 181

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 94
litScript
telegram sharing button
whatsapp sharing button
linkedin sharing button
twitter sharing button
email sharing button
email sharing button
email sharing button
sharethis sharing button