EFFICIENCY OF KILLING ON Vibrio parahaemolyticus IN WATER FROM SHRIMP CULTURED POND OF THE EXTRACTS FROM SAKAE NAA SEED (Combretum quadrangulare)

Abstract

This study was carried out to determine the bactericidal effect of the sakae  naa’s seed extract. The experiment selected concentrations of 17, 20, 23 and 26 mL/L of seed extract per liter of water to assess resistance on Vibrio parahaemolyticus, and BKC chemical (concentration of 0.5 mg/L) was chosen control treatments. The results showed that the killing ability on V. parahaemolyticus of the extract from sakae naa’s seed has gradually increased with the rising-concentration and the period of 2-10 hours after using. At a concentration of 26 mL/L, the extract of seeds gave the highest abilities to kill V. parahaemolyticus (93.8%) at 2 hours and 95.9% at 10 hours after using. In contrast, killing abilities on V. parahaemolyticus of BCK were highest at 2 hours after using (96.1%) and gradually decreased by time to time. The extracts from the seeds of sakae naa (at 26 mL/L of concentration) gave the killing ability on V. parahaemolyticus was equivalent to those of BKC at 0.5 mg/L of concentration.