Abstract
AbstractMultidrug‐resistant Salmonella serotypes (M‐RSs) were isolated from coriander, and an analysis done of the antibacterial activity of roselle calyx extracts against any of the identified strains. One‐hundred coriander samples were collected from markets. Salmonella was isolated from the coriander samples by culture procedure. Susceptibilities to sixteen antibiotics were determined for the isolated Salmonella strains by standard test. The antibacterial effect of four roselle extracts (water, methanol, acetone and ethyl acetate), sodium hypochlorite, acetic acid and colloidal silver against M‐RS isolates was evaluated on contaminated coriander. Thirty‐one Salmonella strains were isolated from 23% of coriander samples. Identified Salmonella serotypes were typhimurium, typhi and montevideo. All isolated strains exhibited resistance to at least three antibiotics. Roselle extracts caused a greater reduction in concentration of M‐RSs than the sodium hypochlorite, colloidal silver and acetic acid on contaminated coriander. Roselle calyx extracts may be a potentially useful addition to disinfection procedures of coriander.Practical applicationsThe colloidal silver solution (Microdyn) and sodium hypochlorite are widely used to disinfect fruit and vegetables in restaurants and home in Mexico. Even, the Health Secretariat of Mexico promotes their use as disinfectants of fruit and vegetables. Roselle (Hibiscus sabdariffa) calyces are reported to have an antimicrobial effect on pathogenic bacteria. There is no information about the reduction in the concentration of multidrug‐resistant Salmonella serotypes (M‐RSs) on coriander by typical disinfectant solutions, such as colloidal silver and sodium hypochlorite or roselle calyx extracts. M‐RSs were isolated from coriander purchased in public markets in Mexico and challenged with roselle calyx extracts, sodium hypochlorite, colloidal silver and acetic acid. The roselle extracts caused a greater reduction in the concentration of M‐RSs than sodium hypochlorite, acetic acid and colloidal silver on coriander. Roselle calyx extracts are a potentially useful addition to disinfection procedures of coriander in the field, processing plants, restaurants and homes.
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