Isolation and characterization of Carnobacterium maltaromaticum from the intestine of sea cucumber Acaudina molpadioides

Aims@#Acaudina molpadioides is a highly valued sea cucumber that is distributed on the muddy shores on the west coast of Peninsular Malaysia and is considered a local delicacy. Carnobacterium maltaromaticum is a type of lactic acid bacteria commonly found in meat, fish and dairy products and is usually isolated from the intestine of aquatic animals. It is scarcely reported from the intestine of A. molpadioides. This species is known to be pathogenic in fish but unknown in humans. The aim of this study was to isolate and characterize C. maltaromaticum from the intestine of A. molpadioides.@*Methodology and results@#Using standard methods, the strains were tested for their biochemical and carbohydrate properties, antibiotic sensitivity tests, temperature sensitivity tests and molecular identification. A total of 1642 isolates were obtained, out of which three strains were chosen as they were catalase-negative, Gram-positive bacilli, negative to IMViC tests, γ-hemolysis, and positive to lactose and glucose tests. Molecular identification was made to strain AM47e and 16S rRNA genes sequence showed 99.93% similar to C. maltaromaticum. The sequence was submitted to GenBank as Carnobacterium maltaromaticum (Accession No: MZ 934727). The optimum growth temperature for the strains was 37°C and the antibiotic susceptibility showed they were sensitive to tetracycline, ampicillin and meropenem.@*Conclusion, significance and impact of study@#In conclusion, C. maltaromaticum can be isolated from the intestine of A. molpadioides with the potential of the probiotic applications and less potential vulnerability for consumers.

Screening of Pathogenic Bacteria From Sea Cucumber Acaudina molpadioides In Pulau Langkawi, Kedah

@#Introduction: The outbreaks of foodborne diseases have been linked to the consumption of contaminated seafood. This research aims to screen the bacteria from the sea cucumbers Acaudina molpadioides collected from Pulau Langkawi. Methods: A total of 22 sea cucumber samples were collected randomly from Pulau Langkawi, Kedah, Malaysia. The samples were isolated and identified for the presence of bacteria using the conventional culture-based method. Presumptive bacteria colonies were subjected to various biochemical and antimicrobial susceptibility tests. Results: There were no bacterial growth in Hektoen Enteric (HE) agar and Thiosulphate-Citrate-Bile Salt (TCBS) agar. Positive samples were isolated from MacConkey (MAC) agar with 6 samples were Staphylococcus spp. (27.27%), 14 samples were Proteus spp. (63.63%) and 2 samples were Bacillus spp. (9.01%). Among these isolates, highest resistance was found against Ampicillin (45%) followed by Tetracycline (40%). Conclusion: The results indicate that the sea cucumbers Acaudina molpadioides were contaminated with potential bacteria. There is a need for adequate consumer protection measures.