A representative production medium for chlorotetracycline typically contains which set of ingredients?

Introduction / Context:
Chlortetracycline production employs complex media that supply carbon, organic nitrogen, and minerals, with buffering to control pH. Corn steep liquor (CSL) provides vitamins and growth factors; CaCO3 helps maintain pH; ammonium salts provide inorganic nitrogen; and a sugar supplies carbon and energy.

Given Data / Assumptions:

• Industrial submerged fermentation with Streptomyces.
• Need for carbon, nitrogen, minerals, and buffering.

Concept / Approach:
A complete production medium should include a sugar (glucose/sucrose/starch hydrolysate), CSL for complex nutrients, CaCO3 for buffering, and ammonium salts such as (NH4)2SO4 and sometimes NH4Cl. Omitting sugar or complex nitrogen would not be representative of a balanced production recipe for high titers.

Step-by-Step Solution:

Verification / Alternative check:
Multiple published formulations follow this pattern, occasionally substituting specific sugars or adjusting ammonium salt ratios, but the component families remain consistent.

Why Other Options Are Wrong:

• Options lacking sugar or CSL are incomplete for typical high-yield production.
• “Mineral salts only” media are insufficient for complex antibiotic biosynthesis at scale.

Common Pitfalls:
Assuming a minimal salts medium can support high secondary metabolite titers without complex nutrients and buffering.

Final Answer:
Sugar, corn steep liquor, CaCO3, (NH4)2SO4, and NH4Cl