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🥒 Pickling vs fermenting: two ways a cucumber lasts

Two jars say dill. One is vinegar you poured. The other is lactic acid a bacterium grew from the cucumber.

5
lessons
~20 min
to learn
🔬 Science
subject
Adults
level
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What you’ll learn

  1. The jar that is not one thingSeparate vinegar-pack pickles from brine-fermented pickles, and treat 'dill' as a herb rather than a method.A cucumber is wet sugar. Vinegar acidifies it at once. A culture acidifies it over weeks. USDA already split the family.
  2. The acid you pourRead a fresh-pack dill as an acidified food under 21 CFR 114: 5 percent vinegar, tested ratios, then heat.Acetic acid is hired. Salt is optional. Bread-and-butter is the same pour with sugar. Clear liquor is the tell.
  3. The acid you growUse McFeeters's 6 percent NaCl and L. plantarum, and USDA's 3–4 week cure, to explain a lactic cucumber ferment.Salt selects. L. plantarum writes lactic acid. pH falls below 3.5. The cloud is the culture.
  4. Why one cucumber goes limpSplit softening (blossom pectinase, heat, missing calcium) from bloating (carbon dioxide), with the USDA cut and ARS calcium as the documented fixes.Cut the blossom scar. Keep the crock under 80°F. Calcium holds the wall. Gas hollows the middle.
  5. What you can still taste tonightSort half-sour, full sour, fresh-pack and refrigerated spears by acid and clock, then go and taste two lids.A week is a half-sour. Three weeks is a full sour. Clear and shelf-stable is vinegar. The cold case is a third contract.

Questions this course answers

A shelf-stable 'dill pickle' in clear liquor and a cloudy crock pickle are different because —

USDA splits fermented dills from fresh-pack pickles that are not fermented. Dill is a herb. The acid is the method.

Match each published rule to the method it actually governs

NCHFP: vinegar strength and ratios are safety in a fresh-pack; salt is safety in a ferment. 21 CFR 114 is the pH ceiling for acidified foods.

Put the USDA fresh-pack dill in the order Guide 6 actually writes

NCHFP Quick Fresh-Pack Dill Pickles: blossom, soak, hot vinegar, then heat. The soak is not a ferment.

About what percent sodium chloride did McFeeters and Perez-Díaz report for a typical commercial cucumber fermentation tank?

McFeeters 2010: cucumbers are commercially fermented in 1.03 M NaCl, which is 6 percent, in open tanks of about 40,000 litres.

What finished equilibrium pH does 21 CFR 114 require of an acidified food?

21 CFR 114.3: acidified foods have finished equilibrium pH of 4.6 or below. That is the line below which C. botulinum cannot grow.

Why does USDA tell you to cut a sixteenth-inch slice off the blossom end?

NCHFP: blossoms may contain an enzyme which causes excessive softening. That enzyme is a pectinase.

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