Advances in Food Science and Technology

Advances in Food Science and Technology ISSN: 6732-4215 Vol. 8 (7), pp. 001-008, July, 2020. © International Scholars Journals

Full Length Research Paper

Microbial evaluation of probiotic beverage from roselle extract

A. A. Aramide, S. H. Abiose and A. H. Adeniran*

Department of Food Science and Technology, Obafemi Awolowo University, Ile-Ife, Nigeria.

Accepted 16 November, 2019

Abstract

The study evaluated viability of probiotic lactobacilli in roselle extract at two different temperatures with view to producing acceptable and health beneficial probiotic beverage. Lactobacillus species isolated from fermented sorghum, maize grains and yoghurt samples were characterized and then inoculated into sterile roselle juice samples. Samples were stored at ambient (27 ± 2°C) and refrigeration temperatures (4 ± 1°C) over a period of four weeks and the viability of the probiotic isolates investigated by using standard methods. Antimicrobial effect of the probiotic isolates on two selected food borne-borne pathogens (Escherichia coli and Staphylococcus aureus) was also determined by the broth culture method. Results showed that the strains (Lactobacillus acidophilus and Lactobacillus plantarum) remained viable in the beverage for 27 days. Except for L. acidophilus which decreased gradually after 21 days of storage, other strains (L. plantarum) (R_y and R_m) increased from an initial count of 1.0 x 10⁶ to 6.4 x 10⁶ and 9.8 x 10⁶ cfu ml^-1 respectively in samples kept at ambient temperature. The results further revealed that the probiotic isolates exhibited varying degree of inhibition against the two selected food-borne pathogens with greater inhibition exhibited against E. coli.

Key words: Roselle extract, probiotics, viability beverage