Determination of the epoxide equivalent weight (EEW) of epoxy resins with different chemical structure and functionality using GPC and 1H-NMR

2006 ◽  
Vol 25 (1) ◽  
pp. 107-113 ◽  
Author(s):  
Sorina-Alexandra Garea ◽  
Andreea-Cristina Corbu ◽  
Calin Deleanu ◽  
Horia Iovu
Keyword(s):  
1H Nmr ◽  
Epoxy Resins ◽  
Chemical Structure ◽  
Equivalent Weight

A comparative technique using as Joint studying to prove structure and determination the Quantitative estimation of organic compound (Irbesartan) as drug in multicomponent tablet form

2019 ◽  
Vol 9 (o3) ◽  
Author(s):  
Imad Tarek Hanoon ◽  
Abed Mohammed Daheir AL-Joubory 2 ◽  
Marwa Mohamed Saied 3
Keyword(s):  
Mobile Phase ◽  
Chemical Structure ◽  
Quantitative Estimation ◽  
Potassium Phosphate ◽  
Hplc Method ◽  
Pharmaceutical Dosage Forms ◽  
Tablet Form ◽  
Rp Hplc ◽  
Percent Recovery

A simple , specific, accurate and precise RP-HPLC method was developed for determination of Irbesartan (IRB) in pharmaceutical dosage forms in tablets products and sachet using symmetry (L 1 ) column at 30°C . The signal was detected at 225 nm. A mobile phase dissolve 0.5 g of buffer potassium phosphate in 100 ml distilled water and adjust pH 2.7 , methanol and acetonitrile at ratio (40 :30 :30 ) . and flow rate 1.2ml/min -1 at pH=7.2 a mobile phase The percent recovery was detected 101 % and the linearity of concentration was 10-50 µg.ml -1 and supported this method by using (FT.I.R.) spectrum method for organic spectrophotometer to prove the chemical structure of this drug and some physical properties . we are obtained the result is identical of other literature . The proposed method was applied successfully for determination of the IRB in tablets products.

1H-NMR investigations. Application of trichloroacetyl isocyanate to structure determination of 3-, 6-, 7-, 7a- and 17-hydroxy steroids

1978 ◽  
Vol 43 (10) ◽  
pp. 2609-2618 ◽  
Author(s):  
Bruno Schönecker ◽  
Dieter Tresselt ◽  
Gerd Schubert ◽  
Ladislav Kohout ◽  
Jan Fajkoš
Keyword(s):  
1H Nmr ◽  
Structure Determination ◽  
Trichloroacetyl Isocyanate
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