Use of Weibull frequency distribution model to describe the inactivation of Alicyclobacillus acidoterrestris by high pressure at different temperatures

BUZRUL S., Alpas H., Bozoglu F.

FOOD RESEARCH INTERNATIONAL, cilt.38, sa.2, ss.151-157, 2005 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 38 Sayı: 2
  • Basım Tarihi: 2005
  • Doi Numarası: 10.1016/j.foodres.2004.09.006
  • Dergi Adı: FOOD RESEARCH INTERNATIONAL
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.151-157
  • Anahtar Kelimeler: Alicyclobacillus acidoterrestris, high hydrostatic pressure, Weibull frequency distribution, THERMAL INACTIVATION, CALCULATING STERILITY, SURVIVAL, HEAT, SPORES, PH, DESIGN
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

The survival curves of Alicyclobacillus acidoterrestris by high hydrostatic pressure were obtained at two pressures (350 and 450 MPa) and three temperature levels (35, 45 and 50 degreesC) in BAM broth. Tailing (upward concavity) was observed in all survival curves. Weibull model was fitted to these data and goodness of fit of this model was investigated. Regression coefficients (R-2), root mean square (RMSE) values and residual plot strongly suggested that Weibull model produced good fit to the data. A better fit was observed for the data at lower pressure (350 MPa). Shape factors of the Weibull model (n values) for 350 NMPa at 35, 45 and 50 degreesC were significantly different from each other (P < 0.05). Two linear emprical equations were obtained for scale factors (b values) at the temperature values studied for 350 and 450 MPa. Such pressure-temperature inactivation models form the engineering basis for design, evaluation and optimization of high hydrostatic pressure processes as a new preservation technique. (C) 2004 Elsevier Ltd. All rights reserved.