DETERMINATION OF OPTIMUM PH AND TEMPERATURE FOR PASTEURIZATION OF CITRUS JUICES BY RESPONSE-SURFACE METHODOLOGY


ULGEN N., OZILGEN M.

ZEITSCHRIFT FUR LEBENSMITTEL-UNTERSUCHUNG UND-FORSCHUNG, cilt.196, ss.45-48, 1993 (SCI İndekslerine Giren Dergi) identifier identifier identifier

  • Cilt numarası: 196 Konu: 1
  • Basım Tarihi: 1993
  • Doi Numarası: 10.1007/bf01192983
  • Dergi Adı: ZEITSCHRIFT FUR LEBENSMITTEL-UNTERSUCHUNG UND-FORSCHUNG
  • Sayfa Sayıları: ss.45-48

Özet

Optimization of microbial death, enzyme inactivation and vitamin C retention during pasteurization of pH-adjusted orange juice is discussed free of equipment-dependent parameters such as the heating lag. The pH-temperature optimum was determined by response surface methodology in the range of 65-degrees-C-75-degrees-C and pH 2.5 4.0. The results implied that there was no pectin-esterase activity below pH 3.5. Leuconostoc mesenteroides had its maximum and minimum thermal resistance at pH 3.5 and pH 2.7, respectively. For an ideal theoretical process requiring four log cycles of microbial reduction the optimum pasteurization conditions were 12 min at 75-degrees-C and pH 2.7.