A new research has found that the leaves of the carob plant, which is used as a substitute to chocolate, contain antibacterial substances that may help fight listeriosis, a serious form of food poisoning.
Nadhem Aissani and colleagues explain that the increase in antibiotic-resistant bacteria has fostered a search for new natural substances to preserve food and control disease-causing microbes. They cite a need for new substances to combat Listeria monocytogenes
, bacteria that caused food poisoning outbreaks in a dozen states with three deaths so far this year. Carob has attracted attention as a potential antibacterial substance, but until now, scientists had not tested it against Listeria
. Carob may be best-known as a substitute for chocolate that does not contain caffeine or theobromine, which makes chocolate toxic to dogs.
Their report describes tests in which extracts of carob leaves proved effective in inhibiting the growth of Listeria
bacteria growing in laboratory cultures. Further, it offers a possible explanation for the antibacterial action. The results were promising enough for the scientists to plan further tests of carob extracts on Listeria
growing in meat and fish samples.