BackgroundCupressus sempervirens is a medicinal plant traditional, its dried leaves are used in treatment of stomach pain, diabetes, inflammation, toothache, laryngitis and as contraceptive.MethodsThe present study was conducted to evaluate the in vitro antimicrobial, antibiofilm and determination chemical contents of the essential oil (Eo) and methanol extract from Mediterranean C. sempervirens L. The chemical composition of a hydrodistilled Eo of C. sempervirens was analyzed by a GC and GC/MS system.ResultsA total of 20 constituents representing 98.1% of the oil were identified: α-pinene (48.6%), δ-3-carene (22.1%), limonene (4.6%) and α-terpinolene (4.5%) were the main components comprising 79.8% of the oil. The antimicrobial test results showed that the methanol extract of C. sempervirens strongly inhibited the growth of the test bacteria studied, except for yeast species while the Eo had moderate antibacterial, but no anti-candida activity. Klebsiella pneumoniae was proven to be the most susceptible against methanol extract. The exposure time of Eo and methanol extract for complete inhibition of cell viability of K. pneumoniae was found to be 250 μg at 30 min and 500 μg at 120 min, respectively. The antibiofilm potential of the samples was evaluated using methods of PVC microtiter and eradication on biomaterial. Visual results showed visible biofilm eradication from the surface of intravenous infusion tube at 500 μg of Eo and methanol extract.ConclusionsThe results presented here may suggest that the Eo and extracts of C. sempervirens possess antimicrobial and antibiofilm properties, and therefore, can be used as natural preservative ingredients in food and/or pharmaceuticals.

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In this study a simple, accurate and precise UV- spectrophotometric method was developed for the estimation of bisoprolol fumarate (BF) in bulk and tablet dosage form. The method was based on measurement of absorbance of BF aqueous solution at 271nm. Validation was conducted in accordance to ICH guidelines. The calibration curve was linear in the concentration range 5-25 µg/mL with correlation coefficient not less than 0.9986. The limit of detection and limit of quantification were 0.22 μg/ml and 0.66 μg/ml, respectively. Intraday and intermediate precision of the developed method were reflected by the low RSD% values (1.19 and 0.854, respectively). The recovery percentage was 105.0 ± 1.3%, n=3. The proposed method was applied for the assay of BF in three different brands

A simple, accurate and precise colorimetric method was developed for the quantification of pregabalin (PGN) in bulk and pharmaceutical formulations. The method was based on the production of a colored complex by reacting PGN with ascorbic acid in DMSO solvent. The resultant complex exhibits absorption maxima at 390 and 532 nm. The factors that affect the complex development and stability were studied and optimized. The reaction stoichiometry of drug: reagent was found to be 1:2. The method was then validated according to ICH guidelines. Regression analysis of Beer's plot showed good correlation (r2 value more than 0.998) within a concentration range of 5-30μg/ml. Linearity was confirmed by standardized residuals versus fitted value plots using Minitab14 software. The limits of detection and quantification at 390 and 532nm were 1.34μg/ml, 1.09μg/ml and 4.05μg/ml, 3.294μg/ml, respectively. Added recovery measurements were found to be 100.04±2.07% and 99.58 ±1.98% at 390nm and 532nm, respectively, which reflect the accuracy of the method and freedom from interference (relative standard deviation values were less than or equal 0.2%). The average assay for the commercial capsule preparation (PGN 150mg/capsule) was found to be 101.373±0.49 and 101.812±0.73 at 390 and 532nm, respectively. The developed method is an inexpensive, extraction free and can be applied for routine analysis of PGN in most of analytical laboratories.