Journal of Pure and Applied MicrobiologyVol. 8 No. May 2014 Special Edition

Effect of High Hydrostatic Pressure Treatment on the Qualities of Cultured Large Yellow Croaker (Pseudosciaena crocea) during Cold Storage

Hua Yang1,2,3, Huien Zhang1, Xiangyang Qi1 and Daodong Pan2*

1Faculty of Biological and Environmental Science, Zhejiang Wanli University, 315100, Ningbo, China. 2School of Marine Sciences, Ningbo University, 315121, Ningbo, China. 3State Key Laboratory of Aquatic Products Processing of Zhejiang Province, 315100, Ningbo, China.

Received on 12 April 2014 and accepted on 09 May 2014

 

ABSTRACT

This study was carried out to evaluate the effect of high hydrostatic pressure on quality changes of cultured yellow croaker (Pseudosciaena crocea) muscle during storage time at 4 ?C. High hydrostaticpressure (HHP) treatments were applied at 100, 200, 300, 400, and 500 MPa for 10 and 15 min. Quality changes include pH, water activity, total volatile basic nitrogen (TVB-N), thiobarbituric acid content(TBA) and trimethylamine (TMA). Total bacterial count of P. crocea muscle?s samples were determined immediately after treatment and throughout subsequent storage at 4 ?C as well. Results have shown P. crocea muscle?s pH value, TBA value content and TMA content increased significantly with the increase of treated pressure, while Aw and TVB-N content decreased as the pressure increased, and the growth of total bacterial count significantly inhibited with increasing pressure. The results showed that the pH value and Aw of P. crocea muscle treated with HPP increased and then decreased during storage; the TVB-N and TMA contents both increased (no more than 35 mg/100 g and 5 mg/100 g, respectively) and were effectively controlled on day 45 after the treatment at 500 MPa for 15 min; and the total colony count of P. crocea was 5.7 ? 104 CFU/mL on day 45 after the treatment at 500 MPa for 15 min. Together these results indicate that the HHP treatment at 500 MPa for 15 min is optimal for the preservation of cultured P. crocea.

Keywords : Pseudosciaena crocea; high hydrostatic pressure; quality.