identification, biosynthesis and classification of alkaloids

alkaloids form complexes with what?

• mercury

• gold

• platinum

• heavy metals

which tests can detect alkaloids by colour or precipitation ?

• hager’s reagent

• mayer’s reagent

• wagner’s reagent

• dragendorff’s reagent

what is used in hager’s reagent and what will be observed?

picric acid

observation:

• yellow ppt

• microcrystalline

• shape

• identified by mpt of picrate 

what is used in Mayer’s reagent and what is observed?

mercuric potassium iodine solution

observation - white/yellow ppt

what is used in Dragendorff’s reagent and what is observed?

potassium bismuth iodide solution

observation- orange ppt

what is used in wagner’s reagent and what is observed?

iodine in potassium iodide

observation- red-brown ppt 

alkaloids are derived from amino acids and are biosynthesised via?

• Decarboxylation

• Transamination

• Schiff base formation

• Mannich condensations

Classification of alkaloids is based on their what?

precursor amino acid OR their heterocyclic ring system