Upgrading of discarded oranges through fermentation using kefir in food industry

Stavros Plessas, Dionysios Kollopoulos, Ylannis Kourkoutas, Constantinos Psarianos, Athanasios Alexopoulos, Roger Marchant, Ibrahim Banat, Athanasios A. Koutinas

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Upgrading of orange pulp suspension by enrichment with kefir was investigated and the effects of initial sugar concentration, pH, aeration and the addition of molasses on kefir growth were monitored. Higher maximum growth rate mu(max) for kefir was observed when initial sugar used was 75 g/l. Both 75 g/l and 90 g/l initial sugar contents of kefir resulted in higher final biomass concentration and daily biomass productivity. At an initial sugar concentration > 75 g/l, however, high residual sugar and ethanol concentrations were observed. Air flow rate and pH affected kefir's p while the addition of molasses had no effect on growth. Potential application of upgraded orange pulp in bread-making was examined. Bread produced by immobilized kefir on orange pulp had an improved aromatic profile in comparison with bread produced by baker's yeast, and preliminary sensory evaluation of the produced bread was acceptable. (c) 2007 Elsevier Ltd. All rights reserved.
LanguageEnglish
Pages40-49
JournalFood Chemistry
Volume106
Issue number1
DOIs
Publication statusPublished - Jan 2008

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kefir
food industry
orange pulp
fermentation
breads
sugars
molasses
bakers yeast
biomass
air flow
aeration
sugar content
aromatic compounds
sensory evaluation
ethanol

Cite this

Plessas, S., Kollopoulos, D., Kourkoutas, Y., Psarianos, C., Alexopoulos, A., Marchant, R., ... Koutinas, A. A. (2008). Upgrading of discarded oranges through fermentation using kefir in food industry. Food Chemistry, 106(1), 40-49. https://doi.org/10.1016/j.foodchem.2007.05.044
Plessas, Stavros ; Kollopoulos, Dionysios ; Kourkoutas, Ylannis ; Psarianos, Constantinos ; Alexopoulos, Athanasios ; Marchant, Roger ; Banat, Ibrahim ; Koutinas, Athanasios A. / Upgrading of discarded oranges through fermentation using kefir in food industry. In: Food Chemistry. 2008 ; Vol. 106, No. 1. pp. 40-49.
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Plessas, S, Kollopoulos, D, Kourkoutas, Y, Psarianos, C, Alexopoulos, A, Marchant, R, Banat, I & Koutinas, AA 2008, 'Upgrading of discarded oranges through fermentation using kefir in food industry', Food Chemistry, vol. 106, no. 1, pp. 40-49. https://doi.org/10.1016/j.foodchem.2007.05.044

Upgrading of discarded oranges through fermentation using kefir in food industry. / Plessas, Stavros; Kollopoulos, Dionysios; Kourkoutas, Ylannis; Psarianos, Constantinos; Alexopoulos, Athanasios; Marchant, Roger; Banat, Ibrahim; Koutinas, Athanasios A.

In: Food Chemistry, Vol. 106, No. 1, 01.2008, p. 40-49.

Research output: Contribution to journalArticle

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AU - Kourkoutas, Ylannis

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AU - Alexopoulos, Athanasios

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AU - Koutinas, Athanasios A.

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AB - Upgrading of orange pulp suspension by enrichment with kefir was investigated and the effects of initial sugar concentration, pH, aeration and the addition of molasses on kefir growth were monitored. Higher maximum growth rate mu(max) for kefir was observed when initial sugar used was 75 g/l. Both 75 g/l and 90 g/l initial sugar contents of kefir resulted in higher final biomass concentration and daily biomass productivity. At an initial sugar concentration > 75 g/l, however, high residual sugar and ethanol concentrations were observed. Air flow rate and pH affected kefir's p while the addition of molasses had no effect on growth. Potential application of upgraded orange pulp in bread-making was examined. Bread produced by immobilized kefir on orange pulp had an improved aromatic profile in comparison with bread produced by baker's yeast, and preliminary sensory evaluation of the produced bread was acceptable. (c) 2007 Elsevier Ltd. All rights reserved.

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