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Caffeine and Theobromine.

Laura J Pearson1, Elmer H Marth1

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This summary is machine-generated.

Caffeine and theobromine from cocoa powder inhibit Listeria monocytogenes growth. Caffeine significantly increased lag phases and generation times, reducing pathogen populations in milk and broth.

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Area of Science:

  • Food microbiology
  • Food safety
  • Microbial growth kinetics

Background:

  • Listeria monocytogenes is a significant foodborne pathogen.
  • Cocoa powder contains bioactive compounds like caffeine and theobromine.
  • Understanding the antimicrobial properties of cocoa components is crucial for food preservation.

Purpose of the Study:

  • To investigate the effects of caffeine and theobromine on the growth of Listeria monocytogenes.
  • To determine the impact of these compounds on microbial lag phase, generation time, and population dynamics.
  • To assess the influence of substrate type (skim milk vs. broth) and compound concentration on antimicrobial activity.

Main Methods:

  • Addition of caffeine (0.5%) and theobromine (2.5%) to skim milk and modified tryptose phosphate broth (MTPB).
  • Inoculation with L. monocytogenes strain V7 (approx. 1 × 10³ CFU/ml) and incubation at 30°C.
  • Monitoring of growth parameters including lag phase, generation time, final population, and pH changes.

Main Results:

  • Both caffeine and theobromine allowed some growth, but caffeine significantly prolonged lag phases (6-9 h vs. <3 h) and increased generation times (2.17 h vs. 1.2 h).
  • Caffeine reduced L. monocytogenes populations by over tenfold (7.21 log₁₀ CFU/ml with caffeine vs. 8.57 log₁₀ CFU/ml without).
  • Theobromine concentration and substrate type had limited effects on pathogen growth; pH changes correlated with growth extent and substrate buffering capacity.

Conclusions:

  • Caffeine exhibits significant inhibitory effects on Listeria monocytogenes growth, primarily by extending lag phase and generation time.
  • While theobromine showed some effect, caffeine appears to be the more potent antimicrobial agent against L. monocytogenes in the tested conditions.
  • These findings suggest potential applications of cocoa-derived compounds in controlling L. monocytogenes in food systems, though further research is warranted.