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Black garlic: Effects of the processing on the kinetics of browning and moisture transfer and on antioxidant properties

L. Pires,Katieli Martins Todisco,N. S. Janzantti,M. A. Mauro

Published 2019 in Journal of food processing and preservation

ABSTRACT

This work aimed to investigate the effects of temperature and relative humidity on the moisture transfer kinetics and browning during black garlic processing. The final product quality was also evaluated based on the total phenolic compounds (TPC) content and antioxidant activity (AA). Garlic bulbs were stored in a temperature and humidity controlled room in NaCl and KCl saturated solutions at 65, 72.5, and 80°C for several days. The diffusion equation that considered external resistance was able to represent the mass transfer kinetics well. The browning kinetics was modeled according to a zero‐order reaction. Black garlic of a suitable color (L*≅10) was obtained in short time periods of 5 days at 80°C, 8 days at 72.5°C and 15 days at 65°C with the water content nearly 42% (NaCl) and 45.5% (KCl), also permitted some formation of TCP compounds and an increasing in AA. PRACTICAL APPLICATIONS: Despite a number of works concerning the production of black garlic, literature remains somewhat empirical and, because of this, there is a lack of mathematical models describing this process. Black garlic processing is in general carried out under a controlled high‐temperature and relative humidity for a long time period. This is, therefore, an energy intensive process. However, as demonstrated in this study, if the operation variables are properly chosen, it is possible to reduce the processing time and, thus, the energy expenditure. Therefore, the present results are useful for the process design and manufacturing of black garlic.

PUBLICATION RECORD

  • Publication year

    2019

  • Venue

    Journal of food processing and preservation

  • Publication date

    2019-07-29

  • Fields of study

    Agricultural and Food Sciences, Chemistry

  • Identifiers
    DOI 10.1111/JFPP.14133
  • External record

    Open on Semantic Scholar

  • Source metadata

    Semantic Scholar

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