scholarly journals Phytochemical Profile of Opuntia ficus-indica (L.) Mill Fruits (cv. ‘Orito’) Stored at Different Conditions

Foods ◽  
2022 ◽  
Vol 11 (2) ◽  
pp. 160
Author(s):  
Francisca Hernández ◽  
Lucía Andreu-Coll ◽  
Andreia Bento-Silva ◽  
Ana Teresa Serra ◽  
Pedro Mena ◽  
...  

This research analyzed the phytochemical profile of prickly pear fruits from ‘Orito’ cultivar stored under cold conditions (2 °C, 85–90% RH) and shelf-life conditions at room temperature (stored at 20 °C for three days after cold storage) for 28 days, mimicking the product life cycle. A total of 18 compounds were identified and quantitated through HPLC-DAD-MS/MS (High-Performance Liquid Chromatographic -Diode Array Detector- Mass Spectrometry) analyses. Phenolic acids such as eucomic acid and betalains such as indicaxanthin were the predominant chemical families, and piscidic acid was the most abundant compound. During cold storage, the content of eucomic acid isomer/derivative and syringaresinol increased, and citric acid decreased, which could be caused by the cold activation of the phenylalanine ammonia-lyase (PAL) and polyphenol oxidase (PPO) enzymes. However, no significant differences were found in the content of these compounds during shelf-life storage. These results showed that ‘Orito’ fruit marketability would be possible up to 28 days after harvesting, retaining its profile, which is rich in bioactive compounds.

Author(s):  
RAMA KUMAR KANDULA ◽  
RAJA SUNDARARAJAN

Objective: The objective of the study was to develope a stability indicating high-performance liquid chromatographic (HPLC) method for simultaneous assay of pentazocine and naloxone in bulk and tablets. Methods: Pentazocine and naloxone were analyzed on Dionex C18 column using 0.1M K2HPO4 buffer (pH 4.0) and methanol (60:40, v/v) as the mobile phase. The concentration of pentazocine and naloxone was quantified by photodiode array detector set at 248 nm. The method was validated in compliance with ICH rules. Pentazocine and naloxone tablet formulation was subjected to forced degradation such as acid, neutral and alkali hydrolysis, oxidation, photo, and thermal degradation. Results: The method was linear, with R2=0.9999 in the concentration range 100–300 μg/ml for pentazocine and R2=0.9995 in the concentration range 1–3 μg/ml for naloxone. The level of detection and quantification was 0.097 μg/ml and 0.322 μg/ml for pentazocine and 0.0073 μg/ml and 0.0243 μg/ml for naloxone, respectively. The degraded products are resolved well from pentazocine and naloxone with significantly different retention time values. From validation results, it was proved that the method is selective, precise, robust, and accurate for the estimation of pentazocine and naloxone simultaneously. Conclusion: The developed stability-indicating HPLC method can be applied for quantitative determination of pentazocine and naloxone in tablets.


2008 ◽  
Vol 91 (3) ◽  
pp. 557-561 ◽  
Author(s):  
Pankaj K Kachhadia ◽  
Ashish S Doshi ◽  
Hitendra S Joshi

Abstract A simple, precise, and accurate isocratic reversed-phase (RP) stability-indicating column high-performance liquid chromatographic (HPLC) assay method was developed and validated for determination of nebivolol in solid pharmaceutical dosage forms. Isocratic RP-HPLC separation was achieved on a Phenomenex Luna C8 (2) column (250 mm 4.6 mm id, 5 m particle size) using mobile phase composed of acetonitrilepH 3.5 phosphate buffer (35 + 65, v/v) at a flow rate of 1.0 mL/min, and detection was performed at 280 nm using a photodiode array detector. The drug was subjected to oxidation, hydrolysis, photolysis, and heat to apply stress conditions. The method was validated for specificity, linearity, precision, accuracy, robustness, and solution stability. The method was linear in the drug concentration range of 40160 g/mL with a correlation coefficient of 0.9999. The repeatability relative standard deviation (RSD) for 6 samples was 0.69, and the intermediate precision (RSD) for 6 samples was 1.39. The accuracy (recovery) was between 98.57 and 99.55. Degradation products produced as a result of stress studies did not interfere with detection of nebivolol, and the assay can thus be considered stability-indicating.


2019 ◽  
Vol 58 (2) ◽  
pp. 144-150
Author(s):  
Demet Dincel ◽  
Olcay Sagirli ◽  
Gulacti Topcu

Abstract In this study, a new, sensitive and selective high-performance liquid chromatographic method was developed for the determination of meropenem (MEM) in human serum. In the developed method, C18 column (3.9 × 150 mm, 5 μm) was selected as stationary phase at 30°C, and methanol: acetic acid solution mixture was used as mobile phase with gradient program. Chromatographic separation was carried out at a flow rate of 1 mL/min, and detection was performed at 300 nm with diode array detector. Doripenem was selected as an internal standard, and the analytes were extracted from serum using protein precipitation method with ortho-phosphoric acid: methanol. Detection wavelength was selected as 300 nm. The developed method was validated according to International Council for Harmonisation (ICH) guidelines. The calibration curve was linear over a concentration range of 4–240 μg/mL with correlation coefficient of 0.9985. The limit of detection and limit of quantification values were found as 0.057 and 0.192 μg/mL, respectively. The validated method was successfully applied for the determination of MEM in human serum samples collected from patient volunteers at different time intervals, and therapeutic drug monitoring of MEM has been investigated.


2008 ◽  
Vol 91 (2) ◽  
pp. 332-338 ◽  
Author(s):  
Branislava Mielji ◽  
Gordana Popovi ◽  
Danica Agbaba ◽  
Slavko Markovi ◽  
Breda Simonovska ◽  
...  

Abstract A gradient reversed-phase column high-performance liquid chromatographic method was developed for the detection and quantification of norfloxacin and its major impurities in norfloxacin-containing pharmaceuticals. Chromatographic separations were performed under the following experimental conditions: column, Zorbax SB RP-18 (5 m, 250 4.6 mm); injection volume, 20 L; mobile phase, 0.05 M NaH2PO4 (pH 2.5)acetonitrile (87 + 13) for 16 min and (58 + 42) for 9 min (stepwise gradient); and flow rate, 1.3 mL/min. All analyses were performed at 25C, and the eluate was monitored at 275 nm using a diode array detector. Linearity (correlation coefficient = 0.999), recovery (99.3101.8), relative standard deviation (0.20.7), and quantitation limit (0.120.47 g/mL) were evaluated and found to be satisfactory. The method is simple, rapid, and convenient for purity control of norfloxacin in both raw materials and dosage forms.


INDIAN DRUGS ◽  
2019 ◽  
Vol 56 (08) ◽  
pp. 61-68
Author(s):  
V. V Gawande ◽  
A. V. Chandewar ◽  

The proposed work involves High Performance Liquid Chromatographic – Diode Array Detector method for estimation of escitalopram oxalate and flupentixol dihydrochloride in combination. The analytes were resolved on Waters C18 Xterra column (50 × 4.6 mm id, particle size 3.5 μm) with mobile phase composition of water (containing 0.2 % triethylamine pH adjusted to 2.5 with orthophosphoric acid): acetonitrile: methanol (62:28:10 % v/v/v). The flow rate kept was 1.0 mL/min opting isocratic mode and eluents were tracked down at 230 nm. The retention times for both the drugs were 1.38±0.21 and 2.98±0.41, respectively. Standard addition method was employed for the analysis of flupentixol dihydrochloride. ICH guidelines were followed to validate the method. The method assured linearity in concentration range of 50-150 μg/mL and 2.5-7.5 μg/mL for ESC and FLU, respectively. The method assured high degree of precision and accuracy. The method was proved to be robust by assessing robustness parameters.


2008 ◽  
Vol 91 (1) ◽  
pp. 67-72 ◽  
Author(s):  
Juliana Sippel ◽  
Letcia L Sfair ◽  
Elfrides E S Schapoval ◽  
Martin Steppe

Abstract A new high-performance liquid chromatographic method was developed and validated for clopidogrel determination in pharmaceutical formulations. The system consisted of an ACE 5 octadecylsilane (C18; 150 4.6 mm id), 5.0 m particle size column; methanol0.1 triethylamine (75 + 25, v/v), pH 5.3, mobile phase at a flow rate of 1.2 mL/min; and a diode array detector set at 220 nm. Specificity, linearity, precision, accuracy, and robustness were the parameters evaluated. The retention time for clopidogrel was 6.8 min. To estimate specificity, an aqueous sample solution was subjected to degradation by ultraviolet light and by acid, alkaline, and oxidation media. The peaks of degradation products did not interfere with the compound signal, and there was no interference when a placebo solution was analyzed. Linearity over a concentration range of 10.0 to 90.0 g/mL was shown (correlation coefficient = 0.9998). Low values of relative standard deviation indicated the adequate intraday and interday precision. The average recovery was found as 99.16. In the robustness test, small modifications to the mobile phase composition did not affect the determination of clopidogrel. The proposed method proved to be simple, fast, and cost efficient for the intended use.


2015 ◽  
Vol 98 (2) ◽  
pp. 390-396 ◽  
Author(s):  
Yang Chen ◽  
Ravinder M Reddy ◽  
Wenjing Li ◽  
Ramesh R Yettlla ◽  
Salvador Lopez ◽  
...  

Abstract An HPLC method for simultaneous determination of vitamins A and D3 in fluid milk was developed and validated. Saponification and extraction conditions were studied for optimum recovery and simplicity. An RP HPLC system equipped with a C18 column and diode array detector was used for quantitation. The method was subjected to a single-laboratory validation using skim, 2% fat, and whole milksamples at concentrations of 50, 100, and 200% of the recommended fortification levels for vitamins A and D3 for Grade “A” fluid milk. The method quantitation limits for vitamins A and D3 were 0.0072 and 0.0026 μg/mL,respectively. Average recoveries between 94 and 110%and SD values ranging from 2.7 to 6.9% were obtainedfor both vitamins A and D3. The accuracy of the method was evaluated using a National Institute of Standards and Technology standard reference material (1849a) and proficiency test samples.


2011 ◽  
Vol 3 (2) ◽  
pp. 383-391
Author(s):  
M. Z. Sultan ◽  
M. A. Mazid ◽  
M. A. Rashid

Cephradine, one of the commonly used and widely prescribed antibiotics in Bangladesh, is usually formulated in the dosage forms of capsule, dry suspension and IV injection. The dry-suspension is instructed to re-disperse in pre-boiled cooled water before use. A reversed phase high performance liquid chromatographic method (HPLC) has been developed for determination of cephradine in pharmaceutical preparation. To study the stability of cephradine suspension formulated by Bangladeshi manufacturers in aqueous medium and buffer of different pHs at room temperature, a simple and rapid chromatographic method was developed using acetonitrile and monobasic sodium phosphate buffer as mobile phase in the ratio of 15:85 (v/v) over C-8 bonded silica at ambient temperature using a flow rate of 1.0 mL/min.  The study revealed that the potency of cephradine suspension was almost stable at room temperature up to 13 days in aqueous medium at pH between 4 and 5.Keywords: Cephradine; Suspension; HPLC; Potency; pH.© 2011 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi:10.3329/jsr.v3i2.7024                J. Sci. Res. 3 (2), 383-391 (2011)


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