Aldehydes and ketones are ubiquitous air pollutants. Along with esters and ethers, they are major components of indoor air pollution and are therefore important for industrial hygiene applications.
With the exception of prolin, amino acids are hardly soluble in alcohols. Therefore, only the adherent moisture can be determined by the direct volumetric method.
Foodstuffs encompass the most diverse products. Depending on whether carbohydrate-rich, fatty or proteinrich substances are under investigation, different working techniques are favourable. Complex matrices that dissolve slowly, or where the water can only be slowly extracted, necessitate the use of
In the present study we demonstrate compliance of silica gel 60 F254 HPTLC plates with USP requirements, and how HPTLC plates are suitable for the Sildenafil citrate-Limit of Imidazole test.