Figure 12.

Antimicrobial activity against bacteria extracted from vacuum-packed beef (‘MAX BEEF’ brand). The discs were impregnated with precipitated eCaCO₃ (a), freshly prepared silver colloids (b), AgNPs/eCaCO₃ (c), and AgNPs/CaCO₃ (d), at concentrations of 500 mg ml⁻¹ (a), 250 mg ml⁻¹ (b) and 125 mg ml⁻¹ (c).