scholarly journals A rapid method for the spectrophotometric determination of niobium in geological samples

1993 ◽  
Author(s):  
B Keshaven ◽  
K P Krishna Prasad
Keyword(s):  
Rapid Method ◽  
Spectrophotometric Determination ◽  
Geological Samples

scholarly journals Spectrophotometric Determination of Ritodrine and Isoxsuprine Hydrochlorides Using 4-Aminoantipyrine

2000 ◽  
Vol 83 (6) ◽  
pp. 1440-1445 ◽  
Author(s):  
Hosakere D Revanasiddappa ◽  
Bochhe Gowda Manju
Keyword(s):  
Quantitative Determination ◽  
Rapid Method ◽  
Spectrophotometric Determination ◽  
Dosage Forms ◽  
Oxidizing Agent ◽  
Ritodrine Hydrochloride ◽  
Colored Product

Abstract A simple, accurate, and rapid method for the quantitative determination of ritodrine hydrochloride (RTH) and isoxsuprine hydrochloride (ISH) in both pure and dosage forms, is described. The method is based on the development of pink colored product as a result of the condensation of 4-aminoantipyrine with phenols in the presence of an alkaline oxidizing agent. The resulting products are measured at 510 nm for both drugs, with molar absorptivities of 0.98 × 104 and 1.20 × 104 L/mol·cm for RTH and ISH, respectively. A study of the effect of commonly associated excipients revealed that they did not cause interference.

Rapid method for the spectrophotometric determination of iridium(IV)

The Analyst ◽  
1985 ◽  
Vol 110 (8) ◽  
pp. 1027 ◽  
Author(s):  
Boregowda Keshavan ◽  
Padmarajaiah Nagaraja
Keyword(s):  
Rapid Method ◽  
Spectrophotometric Determination

Spectrophotometric Determination of Capsaicin

1977 ◽  
Vol 60 (4) ◽  
pp. 970-972 ◽  
Author(s):  
José Jorge Ramos Palacio
Keyword(s):  
Ethyl Acetate ◽  
Rapid Method ◽  
Spectrophotometric Determination ◽  
Acetate Solution ◽  
Ethyl Acetate Solution

Abstract A rapid method has been developed for determining the pungency of hot paprika. Paprika is extracted with ethyl acetate, and an ethyl acetate solution of vanadium oxytrichloride is added just before reading at 720 nm. The method is sensitive for small quantities, i.e., less than 0.05%, and it is not necessary to isolate and purify the capsaicin.

First Derivative Spectrophotometric Determination of Anhydrotetracyclines in Tetracyclines

1988 ◽  
Vol 71 (4) ◽  
pp. 768-772 ◽  
Author(s):  
Abdel-Aziz M Wahbi ◽  
Hamad A Al-Khamees ◽  
Ahmad M A Yousef
Keyword(s):  
Rapid Method ◽  
Spectrophotometric Determination ◽  
Absorption Curve ◽  
British Pharmacopoeia ◽  
Spectrophotometric Methods ◽  
First Derivative ◽  
Tetracycline Hcl

Abstract A rapid method is presented for detection and determination of anhydrotetracycline- HCl (ATC-HC1) and 4-epianhydrotetracycline-HCl (4-EATC-HCl) in tetracycline-HCl (TC-HCl). The method determines the 2 compounds as a sum, not individually. The first derivative absorption curve has a trough (D1) at 460 nm which is linearly related to concentration (1-10 mg/mL). ATC-HC1 + 4-EATC-HCl content was determined in TC-HCl powder and capsules by the D1 and the compensation D1 spectrophotometric methods. The results were compared with those obtained using U.S. Pharmacopeia and British Pharmacopoeia methods

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