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Penicillin Production

Penicillin Production

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PenicillinAlcoholWaterCharcoalDiethyl Ether

Post-Collapse Penicillin Production

Penicillin is a beta-lactam antibiotic secreted naturally by Penicillium chrysogenum and Penicillium rubens molds. Culturing Penicillium mold and extracting pure penicillin without modern pharmaceutical equipment requires strict bio-sanitation, controlled liquid nutrient media, activated charcoal adsorption, and organic solvent extraction.

Core Process & Biological Principles

  1. Isolation & Selection: Identifying Penicillium molds from wild sources (blue-green molds growing on citrus peels, cantaloupes, or bread).
  2. Nutrient Fermentation: Growing mold liquid cultures in submerged or surface fermentation on nutrient broths containing sugar, organic nitrogen, and mineral salts (historically corn steep liquor and lactose).
  3. Secretion: The mold secretes penicillin into the surrounding liquid broth as a secondary metabolite when sugar levels drop.
  4. Filtration & Adsorption: Filtering out mold mycelium and adsorbing the penicillin dissolved in the broth onto Charcoal particles.
  5. Solvent Extraction: Eluting penicillin from charcoal into Alcohol or Ether, shifting pH with mild acids to isolate raw penicillin crystals.

Step-by-Step Cultivation and Extraction Protocol

1. Growth Medium Preparation

  • Prepare a liquid broth consisting of boiled water, 2% glucose or lactose (corn sugar or milk whey), 1% corn steep liquor or yeast extract, and small amounts of mineral salts (calcium nitrate, potassium phosphate).
  • Sterilize all glass culture jars and broth thoroughly using a pressure cooker or Autoclave at 121°C (15 psi) for 20 minutes.

2. Inoculation and Fermentation

  • Transfer spores of verified Penicillium mold into cooled sterile jars inside a draft-free, sanitized workspace.
  • Incubate jars at 22°C–25°C. A white velvety fungal mat will form on the surface, turning blue-green as spores develop.
  • Allow fermentation to proceed for 6 to 7 days until maximum penicillin concentration is secreted into the yellow broth beneath the fungal mat.

3. Separation and Extraction

  • Siphon off the liquid broth and pass it through a fine cloth Water Filter to remove all mold solids. Cool the liquid to near 0°C.
  • Add 1% finely ground activated Charcoal to the broth and stir for 15 minutes. Charcoal adsorbs the penicillin molecules.
  • Filter the charcoal out of the liquid and wash it with cold distilled water.
  • Elute (wash) the charcoal with an organic solvent like cold Ether or Alcohol mixed with water acidified to pH 2.0 using diluted acid. Penicillin dissolves into the solvent phase.
  • Neutralize the solvent solution back to pH 6.0 with sodium bicarbonate and evaporate the solvent at low temperature to yield crude Penicillin salt.

Limits and Safety Warnings

  • Lethal Contamination: Unsterile culturing can grow lethal pathogens (e.g., Aspergillus flavus producing carcinogenic aflatoxins) alongside mold. Never use unpurified moldy bread directly on open wounds.
  • Hypersensitivity: Penicillin causes severe allergic reactions (anaphylaxis) in sensitive individuals.
  • Potency Variation: Uncalibrated post-collapse batches vary significantly in concentration; under-dosing promotes bacterial resistance, while over-dosing can cause toxicity.