Microbial products by fermentation Technology

Primary metabolites

Small molecules of living cells Intermediates or end products of the pathway.

Related to synthesis of microbial cells in the growth phase. Include alcohols, amino acids, nucleotides, organic acids, polyols, vitamins, and enzymes

e.g. Lactic acid,citric acid

Secondory metabolites Accumulate following active growth.

Have no direct relationship to synthesis of cell material and natural growth

Include antibiotics and toxins