Plasma Ozonizer System and Its Application on Extending the Shelf Life of Seafood from Pak Nakhon Bay, Nakhon Si Thammarat
Keywords:
plasma ozonizer system, seafood, shelf lifeAbstract
This research aims to develop plasma ozonizer system and investigate factors which affected the ozone output for application on extending the shelf life of seafood obtained from Pak Nakhon area. The system was composed of high-frequency high-voltage power supply and ozonizer tubes. The power supply of system using ignition coil. The high voltage output was 6-16 kV and high frequency was 2 kHz. Plasma ozonizer was a cylinder-cylinder electrode consist of two electrodes. Outer and inner electrode was made of stainless steel, which inner electrode was covered with pyrex glass as dielectric. Discharge gap between electrode was fixed at 7.5 mm. Ozone concentration generated by this ozonizer in ranges of 19-87 mg/l at 6-8 kV and optimum purified oxygen feed rate of 2 l/min. In applying for Scylla serrata, Perna viridis and Plotosus lineatus. The efficiency of ozone water to reduce E. coli artificially contaminated on seafood was studied. The initial number of E. coli was 6 log CFU/g after treated with ozone water at 6-8 kV and discharge time 10-120 second the reduction of E. coli were reduced 1-5 log CFU/g (p≤0.05). The relationships between the reduction of E. coli (Y) with voltages (X1) and discharged times (X2) in each sample showed that Y=0.262X1+0.959X2 (R2=0.988), Y=0.273X1+0.946X2 (R2=0.985) and Y=0.703X1+0.679X2 (R2=0.977), respectively. The regression equations could be used to predict discharge time and the effectiveness of ozone water on the reduction of the target organisms. The samples were treated with ozone water the results showed shelf life of three types was extended to at least 10 days, while shelf life of control was 4 days. Sensory qualities of ozonated water samples was better than control sample (p≤0.05).
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