COMPARATIVE STUDIES OF DIFFERENT NATURAL PRESERVATIVES (GARLIC, GINGER AND APPLE CIDER) IN INHIBITING MICROBIAL GROWTH.

The rising concern over the safety of synthetic food preservatives has driven interest in exploring natural alternatives with effective antimicrobial properties. In this context, plant-derived substances such as garlic (Allium sativum), ginger (Zingiber officinale), and apple cider vinegar have gained attention due to their bioactive components and potential application in food preservation. This study focused on evaluating and comparing the antimicrobial effectiveness of these natural preservatives against selected foodborne pathogens and spoilage fungi. The aim was to identify the most potent agent among them and assess their suitability for use as natural preservatives in food systems. The research was conducted using standard microbiological methods, including the isolation and identification of microbial strains, preparation of both aqueous and ethanol extracts of garlic, ginger, and apple cider vinegar, and assessment of antimicrobial activity using the disc diffusion technique. Test organisms included Escherichia coli, Klebsiella pneumoniae, Staphylococcus aureus, Streptococcus species, Aspergillus niger, and Aspergillus fumigatus. Zones of inhibition were measured to determine the efficacy of each extract at different concentrations. The results showed that apple cider vinegar, particularly in ethanol extract form at 100 mg/mL, exhibited the highest antimicrobial activity against all bacterial isolates and intermediate activity against fungal isolates. Garlic and ginger extracts demonstrated moderate inhibition, also more pronounced in ethanol extracts and at higher concentrations, while aqueous extracts were generally less effective. Among the microbial strains tested, S. aureus and E. coli were more susceptible, while fungi exhibited greater resistance overall. Ihe findings support the antimicrobial potential of natural plant-based preservatives, with apple cider vinegar emerging as the most effective agent in this comparative study. Its broad-spectrum activity highlights its promise as a viable alternative to synthetic preservatives in food systems. It is recommended that future applications focus on optimizing concentration, extraction techniques, and formulation strategies to improve efficacy while maintaining sensory qualities. The use of natural preservatives like these should be encouraged in clean-label food production to promote safety, consumer acceptability, and sustainability.