Thermal characteristics of Agaricus bisporus mushroom

Freezing point, glass transition, and maximal-freeze-concentration condition

N. Guizani, M. S. Rahman, M. Klibi, A. Al-Rawahi, S. Bornaz

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The stability of foods strongly depends on the state of water (i.e. water activity) and temperature. Agaricus bisporus mushroom plays an important role as a nutritional and functional food; however little information is available on the effect of processing on its stability. This study measures the thermal characteristics and sorption isotherm of Agaricus bisporus by differential scanning calorimetry (DSC) and isopiestic method, respectively. Thermograms of samples containing un-freezable water (below moisture content 0. 11 g/g sample, i.e. wet basis) showed no glass transition which is indicative of the complexity of mushroom texture. Samples containing freezable water above 0.17 g/g sample exhibited glass transition. The BET monolayer value was 0.061 g/g dry-solids (i.e. dry basis). Actual maximal-freeze-concentration conditions was found as Xs' (characteristic solids content) = 0.782 g/g sample, and Tm' (characteristic end point of freezing) = -30oC. The glass transition data and isotherm of A. bisporus containing un-freezable water could be used to determine stability region of dried mushroom during its storage, whereas Tm' to determine the stability for the frozen storage. In addition it could be used in designing drying and freezing processes, respectively.The stability of foods strongly depends on the state of water (i.e. water activity) and temperature. Agaricus bisporus mushroom plays an important role as a nutritional and functional food; however little information is available on the effect of processing on its stability. This study measures the thermal characteristics and sorption isotherm of Agaricus bisporus by differential scanning calorimetry (DSC) and isopiestic method, respectively. Thermograms of samples containing un-freezable water (below moisture content 0. 11 g/g sample, i.e. wet basis) showed no glass transition which is indicative of the complexity of mushroom texture. Samples containing freezable water above 0.17 g/g sample exhibited glass transition. The BET monolayer value was 0.061 g/g dry-solids (i.e. dry basis). Actual maximal-freeze-concentration conditions was found as Xs' (characteristic solids content) = 0.782 g/g sample, and Tm' (characteristic end point of freezing) = -30oC. The glass transition data and isotherm of A. bisporus containing un-freezable water could be used to determine stability region of dried mushroom during its storage, whereas Tm' to determine the stability for the frozen storage. In addition it could be used in designing drying and freezing processes, respectively.

Original languageEnglish
Pages (from-to)1945-1952
Number of pages8
JournalInternational Food Research Journal
Volume20
Issue number4
Publication statusPublished - 2013

Fingerprint

Agaricus
glass transition
Agaricus bisporus
Agaricales
freezing point
mushrooms
Freezing
Glass
Hot Temperature
heat
Water
sampling
water
Functional Food
sorption isotherms
Differential Scanning Calorimetry
frozen storage
differential scanning calorimetry
water activity
functional foods

Keywords

  • Differential scanning calorimetry
  • Glass transition temperature
  • Maximal-freeze-concentration condition
  • Mushroom
  • Sorption isotherms
  • Water activity

ASJC Scopus subject areas

  • Food Science

Cite this

Thermal characteristics of Agaricus bisporus mushroom : Freezing point, glass transition, and maximal-freeze-concentration condition. / Guizani, N.; Rahman, M. S.; Klibi, M.; Al-Rawahi, A.; Bornaz, S.

In: International Food Research Journal, Vol. 20, No. 4, 2013, p. 1945-1952.

Research output: Contribution to journalArticle

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