tirthankar choudhury (80 risultati)

Condizione: New.

Taschenbuch. Condizione: Neu. Neuware -La spettroscopia UV è un tipo di spettroscopia di assorbimento in cui la luce della regione ultravioletta (200-400nm.) viene assorbita dalla molecola. L'assorbimento delle radiazioni ultraviolette provoca l'eccitazione degli elettroni dallo stato fondamentale a uno stato di energia superiore. L'energia delle radiazioni ultraviolette assorbite è pari alla differenza di energia tra lo stato fondamentale e gli stati energetici superiori.Books on Demand GmbH, Überseering 33, 22297 Hamburg 56 pp. Italienisch.

Condizione: New.

Condizione: New.

Taschenbuch. Condizione: Neu. Neuware -This research revealed that the numbers of available heterocyclic compounds are mainly focused on nitrogen-containing compounds, such as quinazolines, indoles, benzimidazole, quinoxalines, coumarins, and pyrimidines, etc. A mixture of substituted aldehydes (0.01 mol) like acetylacetone (method 1) or ethyl acetoacetate (method 2), urea or thiourea (0.01 mol) and lemon juice (0.5 ml) were taken into a round bottom flask and reflux for 1 hour under continuous stirring. After completion of the reaction, the final product was recrystallized for purification. Simultaneously toxicity and anti-inflammatory activity were performed. But in case of using ethyl acetoacetate in method 2, the percentage yield was more as compared to using acetylacetone in method 1. So the derivatives obtained from method 2 were selected for further toxicity and anti-inflammatory activities.Books on Demand GmbH, Überseering 33, 22297 Hamburg 52 pp. Englisch.

Taschenbuch. Condizione: Neu. Neuware -UV spectroscopy is type of absorption spectroscopy in which light of ultra-violet region (200-400 nm.) is absorbed by the molecule. Absorption of the ultra-violet radiations results in the excitation of the electrons from the ground state to higher energy state. The energy of the Ultraviolet radiation that are absorbed is equal to the energy difference between the ground state and higher energy states.Books on Demand GmbH, Überseering 33, 22297 Hamburg 56 pp. Englisch.

Taschenbuch. Condizione: Neu. Neuware -This UV-spectrophotometric technique is quite simple, accurate, precise,reproducible, and sensitive. The UV method has been developed for quantification of Methylphenidate in tablet formulation. It involves absorbance measurement at 288 nm (¿max of Methylphenidate) in Ethanol and distilled water (89:11) ratio. For the UV Spectrophotometric method, linearity was obtained in a concentration range of 1-50µg/ml for methylphenidate and with a regression value of 0.9998. Recovery was found in the range of 98-101%. The standard deviation and % RSD were found to beBooks on Demand GmbH, Überseering 33, 22297 Hamburg 72 pp. Englisch.

Taschenbuch. Condizione: Neu. Neuware -A rapid and precise Reverse Phase High Performance Liquid Chromatographic method has been developed for the validated of Piroxicam, in its pure form as well as in tablet dosage form. Chromatography was carried out on X-terra C18 (4.6 x 250mm, 5¿m) column using a mixture of Acetonitrile and Water (40:60 v/v) as the mobile phase at a flow rate of 0.9ml/min, the detection was carried out at 227nm. The retention time of the Piroxicam was 5.430 ±0.02min respectively. The method produce linear responses in the concentration range of 10-50mg/ml of Piroxicam.The method precision for the determination of assay was below 2.0%RSD. The method is useful in the quality control of bulk and pharmaceutical formulations.Books on Demand GmbH, Überseering 33, 22297 Hamburg 112 pp. Englisch.

Taschenbuch. Condizione: Neu. Neuware -This research work focused on UV and RP-HPLC method and method validation of Nevirapine accurately and economically. UV spectrophotometric method and mehod development for Nevirapine obeyed Beer's law as depicted by linearity of the developed method. A reverse phase HPLC (RP-HPLC) method is described for the determination of nevirapine in tablet dosage forms. Chromatography was carried on an ODS column using a mixture of methanol and water (89:11 v/v) as the mobile phase at a flow rate of 1 mL/min with detection at 284 nm. The method was validated by determining its sensitivity, accuracy and precision. The proposed method is simple, economical, fast, accurate and precise, hence can be applied for routine quality control of nevirapine in bulk and tablet dosage forms.Books on Demand GmbH, Überseering 33, 22297 Hamburg 108 pp. Englisch.

Condizione: New.

Condizione: New.

Taschenbuch. Condizione: Neu. Neuware -UF-spektroskopiq - äto wid absorbcionnoj spektroskopii, w kotoroj swet ul'trafioletowoj oblasti (200-400nm.) pogloschaetsq molekuloj. Pogloschenie ul'trafioletowogo izlucheniq priwodit kwozbuzhdeniü älektronow iz osnownogo sostoqniq w sostoqnie s bolee wysokoj änergiej. Jenergiq pogloschennogo ul'trafioletowogo izlucheniq rawna raznosti änergij mezhdu osnownym i bolee wysokim änergeticheskimi sostoqniqmi.Books on Demand GmbH, Überseering 33, 22297 Hamburg 56 pp. Russisch.

Taschenbuch. Condizione: Neu. Neuware -Jetot UF-spektrofotometricheskij metod dowol'no prost, tochen, tochen, wosproizwodim i chuwstwitelen. UF-metod byl razrabotan dlq kolichestwennogo opredeleniq metilfenidata w tabletkah. On wklüchaet izmerenie opticheskoj plotnosti pri 288 nm (max. metilfenidata) w sootnoshenii ätanola i distillirowannoj wody (89:11). Dlq UF-spektrofotometricheskogo metoda linejnost' byla poluchena w diapazone koncentracij 1-50 mkg/ml dlq metilfenidata i so znacheniem regressii 0,9998. Vosstanowlenie bylo obnaruzheno w predelah 98-101%. Standartnoe otklonenie i % RSD okazalis'Books on Demand GmbH, Überseering 33, 22297 Hamburg 64 pp. Russisch.

Taschenbuch. Condizione: Neu. Neuware -Diese UV-spektrophotometrische Technik ist recht einfach, genau, präzise, ¿¿reproduzierbar und empfindlich. Die UV-Methode wurde zur Quantifizierung von Methylphenidat in Tablettenformulierungen entwickelt. Dabei handelt es sich um eine Absorptionsmessung bei 288 nm (maximales Methylphenidat) im Verhältnis von Ethanol und destilliertem Wasser (89:11). Für die UV-spektrophotometrische Methode wurde die Linearität in einem Konzentrationsbereich von 1¿50 µg/ml für Methylphenidat und mit einem Regressionswert von 0,9998 erhalten. Die Wiederherstellung lag im Bereich von 98¿101 %. Die Standardabweichung und der % RSD lagen beiBooks on Demand GmbH, Überseering 33, 22297 Hamburg 64 pp. Deutsch.

Taschenbuch. Condizione: Neu. Neuware -Die UV-Spektroskopie ist eine Art der Absorptionsspektroskopie, bei der Licht im ultravioletten Bereich (200-400nm) von den Molekülen absorbiert wird. DieAbsorption der ultravioletten Strahlung führt zu einerAnregung der Elektronen aus dem Grundzustand in einen Zustand höherer Energie. Die Energie der absorbierten ultravioletten Strahlung ist gleich der Energiedifferenz zwischen dem Grundzustand und den höheren Energiezuständen.Books on Demand GmbH, Überseering 33, 22297 Hamburg 56 pp. Deutsch.

Taschenbuch. Condizione: Neu. Neuware -La espectroscopia UV es un tipo de espectroscopia de absorción en la quela molécula absorbe luz de la región ultravioleta (200-400nm.). Laabsorción de las rad iaciones ultravioletas provoca laexcitación de los electrones desde el estado básico al estado de mayor energía. Laenergía de la radiación ultravioleta que se absorbe es igual a la diferencia de energía entre el estado básico y los estados de mayor energía.Books on Demand GmbH, Überseering 33, 22297 Hamburg 56 pp. Spanisch.

Taschenbuch. Condizione: Neu. Neuware -Esta técnica espectrofotométrica UV es bastante simple, precisa, reproducible y sensible. El método UV se ha desarrollado para la cuantificación de metilfenidato en formulaciones de comprimidos. Implica la medición de la absorbancia a 288 nm (¿max de metilfenidato) en una proporción de etanol y agua destilada (89:11). Para el método espectrofotométrico UV, la linealidad se obtuvo en un rango de concentración de 1-50 µg/ml para metilfenidato y con un valor de regresión de 0,9998. La recuperación se encontró en el rango del 98-101%. Se encontró que la desviación estándar y el % RSD eranBooks on Demand GmbH, Überseering 33, 22297 Hamburg 60 pp. Spanisch.