Graduate Thesis Or Dissertation
 

Adhesive property of bacteria and its relationship to microbial spoilage of shrimp

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  • Pacific shrimp (Pandalus jordani) was washed repeatedly and the eluted bacteria were enumerated and identified. Selected isolates were tested for their adhesive properties. Washing reduced the microbial load by 3.84 to 42.04%. The bacteria which most resisted wash-off were Staphylococcus and Pseudomonas spp. The easiest to wash off was Flavobacterium spp. In higher-count samples, Moraxella and/or Lactobacillus spp. washed off readily, but they still constituted large proportions of the residual bacteria on shrimp. Adhesiveness, measured by hydrophobic interaction with octane, showed 43.3% change in absorbance by Staphylococcus spp., followed by 21.5% by Moraxella spp., and Arthrobacter spp. at 13.5%. Pseudomonas spp. showed only 5.7% change in absorption. Attachment, measured by hanging glass cover slips in broth, however, showed Pseudomonas and Staphylococcus spp. to have the greatest ability to adhere, with 0.47 and 0.46% attachment, respectively. Moraxella spp. showed the least ability to adhere to glass (.02%), followed by Lactobacil lus spp. at 0.11%. Arthrobacter and Flavobacterium spp. adhered at 0.30 and 0.37% levels, respectively. Attachment of Pseudomonas spp. to glass was the least affected by media composition, temperature, or presence of a surface-active agent (sodium hexametaphosphate). Staphylococcus spp., on the other hand, attached most strongly under optimum growth conditions but were most affected by varying growth conditions, temperature, and presence of a metabolic inhibitor (sodium hexametaphosphate). This indicates that the adhesive ability of Staphylococcus spp. is directly related to its metabolic activity, while Pseudomonas spp. is less sensitive to changes in metabolism and may depend on motility for adhesion. Bacteria that could adhere strongly on solid surfaces (Pseudomonas and Staphylococcus spp.) tend to be found in greater proportions and, hence, contribute more to the spoilage of shrimp.
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