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Thermal inactivation of pectin methylesterase in pineapple juice

  • Domenico Cautela
  • Domenico Castaldo
  • Bruna Laratta
Original Paper
  • 3 Downloads

Abstract

Thermal processing is usually used by the fruit juice industry for enzyme and microbial inactivation, thus limiting organoleptic changes that affect shelf life and quality of products. Mainly the inactivation of enzymes is necessary to avoid quality changes related to cloud loss, using mild temperature that allows minor alterations in product’s sensory as well as in nutritive traits. Pineapple juice, a product obtained by diluting the concentrate juice and pasteurizing afterword shipped to Europe, has a high residual pectin methylesterase (PME) activity. In this view, the present work provides a detailed kinetic study of the effect of pasteurization on inactivation of PME in pineapple juice. The fresh juice was treated with temperatures ranging from 70 to 95 °C, for various times, until the complete denaturation of PME occurred. Results of thermal stabilization treatments showed that enzyme inactivation behaviour follows a first-order kinetic process, in the studied temperature range. Moreover, the reaction rate constants for denaturation of PME were determined; in particular, activation energy (Ea), decimal reduction time (Dref), and z value (z), were 78.2 ± 4.5 kJ/mol, 16 s (at reference temperature of 106 °C) and 36 ± 3 °C, respectively. Based on the thermal resistance data here reported to inactivate PME, a treatment of 106 °C with a mean holding time of 1 min should be employed in order to preserve cloudiness of pasteurized pineapple juice.

Keywords

Pineapple juice Pectin methylesterase Thermal inactivation Decimal reduction time Cloud loss 

Notes

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

11694_2018_9894_MOESM1_ESM.tif (199 kb)
Supplementary material 1—Fig. S1. Pisneapple juice product showing a typical cloud loss phenomenon (TIF 198 KB)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Stazione Sperimentale per le Industrie delle Essenze e dei derivati dagli Agrumi (SSEA) - Azienda Speciale della Camera di Commercio di Reggio CalabriaReggio CalabriaItaly
  2. 2.Ministero dello Sviluppo Economico (MiSE)RomaItaly
  3. 3.Università degli Studi di Salerno Dipartimento di Ingegneria Industriale e ProdAL scarl, via Ponte Don MelilloFiscianoItaly
  4. 4.Istituto di Biologia Agro-ambientale e Forestale (IBAF), Consiglio Nazionale delle RicercheNapoliItaly

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