scholarly journals New Polymeric Potentiometric Coated Wire Sensors for Determination of Montelukast Sodium in Commercial Products

2021 ◽  
pp. ArticleID:210634
Author(s):  
Salma Ali Al-Tamimi ◽  
Keyword(s):  
Commercial Products ◽  
Montelukast Sodium ◽  
Coated Wire

scholarly journals Antimicrobial Efficiency of Aloe arborescens and Aloe barbadensis Natural and Commercial Products

Plants ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 92
Author(s):  
Kaja Kupnik ◽  
Mateja Primožič ◽  
Željko Knez ◽  
Maja Leitgeb
Keyword(s):  
Biological Activities ◽  
Antimicrobial Properties ◽  
Aloe Barbadensis ◽  
Commercial Products ◽  
Qualitative And Quantitative ◽  
Gram Positive Bacteria ◽  
Antimicrobial Efficiency ◽  
Aloe Arborescens ◽  
Pharmaceutical Industries

Nowadays, there are many commercial products from natural resources on the market, but they still have many additives to increase their biological activities. On the other hand, there is particular interest in natural sources that would have antimicrobial properties themselves and would inhibit the growth and the reproduction of opportunistic microorganisms. Therefore, a comparative antimicrobial study of natural samples of aloe and its commercial products was performed. Qualitative and quantitative determination of antimicrobial efficiency of Aloe arborescens and Aloe barbadensis and its commercial products on fungi, Gram-negative, and Gram-positive bacteria was performed. Samples exhibited antimicrobial activity and slowed down the growth of all tested microorganisms. Research has shown that natural juices and gels of A. arborescens and A. barbadensis are at higher added concentrations comparable to commercial aloe products, especially against microbial cultures of Bacillus cereus, Candida albicans, and Pseudomonas aeruginosa, whose growths were completely inhibited at a microbial concentration of 600 μg/mL. Of particular importance are the findings of the good antimicrobial efficacy of fresh juice and gel of A. arborescens on tested microorganisms, which is less known and less researched. These results show great potential of A. arborescens for further use in medicine, cosmetics, food, and pharmaceutical industries.

Functionalized carbon nanotube/ionic liquid-coated wire as a new fiber assembly for determination of methamphetamine and ephedrine by gas chromatography-mass spectrometry

2014 ◽  
Vol 6 (21) ◽  
pp. 8645-8653 ◽  
Author(s):  
Omid Narimani ◽  
Naser Dalali ◽  
Kobra Rostamizadeh
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Ionic Liquid ◽  
Carbon Nanotube ◽  
Steel Wire ◽  
Gas Chromatography Mass Spectrometry ◽  
Fiber Assembly ◽  
Coated Wire ◽  
Headspace Spme

Carbon nanotube–ionic liquid gel immobilized on a stainless steel wire as a novel fiber was successfully applied for headspace SPME of methamphetamine and ephedrine.

Gas Chromatographic Determination of Yohimbine in Commercial Yohimbe Products

1995 ◽  
Vol 78 (5) ◽  
pp. 1189-1194 ◽  
Author(s):  
Joseph M Betz ◽  
Kevin D White ◽  
Ara H Der Marderosian
Keyword(s):  
Anabolic Steroids ◽  
Chromatographic Determination ◽  
The United States ◽  
Methyl Silicone ◽  
Capillary Gc ◽  
Plant Materials ◽  
Commercial Products ◽  
Authentic Material ◽  
Total Alkaloids

Abstract The bark of Pausinystalia yohimbe [K. Schumann] Pierre (Rubiaceae), long valued as an aphrodisiac in West Africa, recently has been promoted in the United States as a dietary supplement alternative to anabolic steroids for enhancement of athletic performance. As the number of yohimbe products on the retail market increases, concerns about their safety are raised because of the reported toxicity of yohimbine (the major alkaloid of the plant). Although plant materials are usually identified microscopically, we were unable to identify them in many of the products, because as their labels indicated, the products were mixtures of various bo-tanicals or were bark extracts and contained little or no plant material. A method for extraction and capillary gas chromatographic (GC) separation of the alkaloids of P. yohimbe was, therefore, developed and used to analyze a number of commercial yohimbe products. The method involved solvent extraction and partitioning in chloroform–water followed by separation on a methyl silicone capillary GC column (N–P detection). Comparisons of chromatograms of extracts of authentic bark with those of commercial products indicated that, although many products contained measurable quantities of the alkaloid yohimbine, they were largely devoid of the other alkaloids previously reported in this species. Concentrations of yohimbine in the commercial products ranged from <0.1 to 489 ppm, compared with 7089 ppm in the authentic material. Authentic bark has been reported to contain up to 6% total alkaloids, 10–15% of which are yohimbine. The possible presence of undeclared diluents in the products was indicated by peaks in product chromatograms but not in those of authentic bark.

Spectrophotometric Determination of Aminacrine Hydrochloride in Creams, Jellies, and Suppositories: Interlaboratory Study

1987 ◽  
Vol 70 (3) ◽  
pp. 560-565
Author(s):  
Elaine A Bunch
Keyword(s):  
Thin Layer ◽  
Spectrophotometric Determination ◽  
Spectrophotometric Method ◽  
Coefficient Of Variation ◽  
Visible Spectrum ◽  
Interlaboratory Study ◽  
Commercial Products ◽  
Absorbance Maximum

Abstract A previously reported visible spectrophotometric method for the analysis of aminacrine hydrochloride in creams, jellies, and suppositories was studied collaboratively by 8 laboratories. Aminacrine hydrochloride was extracted into acidic ethanol and its visible spectrum recorded. The amount present was calculated by determining the net absorbance between the absorbance maximum at about 402 nm and one-half the sum of the absorbance of the minima at about 389 and 412 nm. Each collaborator received 4 creams (0.2%), 1 jel (0.2%), 1 molded suppository (6 mg/3.198 g), and 2 gelatin-encapsulated suppository samples (12 mg/6.661 g and 14 mg/6.863 g). The cream samples included blind duplicates prepared to contain 0.212% aminacrine hydrochloride, 15% sulfanilamide, and 2% allantoin. Mean recovery for the authentic cream was 104.7% with a coefficient of variation (CV) of 9.22%. The commercial products contained these respective amounts (CVs): creams, 100.0% (2.48%) and 101.5% (2.16%); jel, 118.0% (9.58%); molded suppository, 102.7% (1.88%); and gelatin encapsulated suppositories, 93.1% (1.0%) and 94.3% (1.60%). Standard aminacrine hydrochloride provided for the study was 99.6% pure by nonaqueous titration. Thin layer chromatographic identification of aminacrine hydrochloride was also tested collaboratively. The method was not adopted by AOAC.

Liquid Chromatographic Determination of trans-10-Hydroxy-2-Decenoic Acid Content of Commercial Products Containing Royal Jelly

1995 ◽  
Vol 78 (4) ◽  
pp. 1019-1023 ◽  
Author(s):  
Bosco C Bloodworth ◽  
Chan Sheot Harn ◽  
Chua Teck Hock ◽  
Yio Oon Boon
Keyword(s):  
Liquid Chromatography ◽  
Acid Content ◽  
Royal Jelly ◽  
Chromatographic Determination ◽  
Decenoic Acid ◽  
Commercial Products ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract Thirty-nine samples of commercial products containing royal jelly were analyzed by liquid chromatography for their trans-10-hydroxy-2-decenoic acid (10-HDA) content. Most of the samples contained 10-HDA. Samples claimed to be pure royal jelly contained 1.98 to 6.37% 10-HDA (w/w). The 10-HDA content of samples claimed to contain royal jelly as an ingredient ranged from nondetectable to 1.28% (w/w).

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