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Effects of enrichment with polyphenolic extracts from Sardinian plants on physico-chemical, antioxidant and microbiological properties of yogurt

Cossu, Massimo and Juliano, Claudia Clelia Assunta and Pisu, Rosa and Alamanni, Maria Cristina Paolina (2009) Effects of enrichment with polyphenolic extracts from Sardinian plants on physico-chemical, antioxidant and microbiological properties of yogurt. Italian Journal of Food Science, Vol. 21 (4), p. 447-459. ISSN 1120-1770. Article.

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Abstract

The effect of adding artichoke (Cynara scolymus L.), strawberry-tree fruit (Arbutus unedo L.) and cherry (Prunus avium L.) extracts was evaluated on the physico-chemical, antioxidant and microbiological properties of homemade yogurts. Yogurts, enriched with artichoke or red ripe strawberry-tree fruit extract, demonstrated high in vitro antioxidant activity. Ten days after their preparation, no variations in the antioxidant components and antioxidant activity of the yogurts were observed. The enriched yogurts showed an increase in lactic acid and acetaldehyde. As regards microbial characteristics, there was a notable increase in the microbial count of Lactobacilli in yogurts with edible artichoke parts (4.5x109 cfu/g) and with strawberry-tree fruit extracts (1.8x109 cfu/g) during the threeweek experimental period. During the same period persistence of Streptococci in yogurt with artichoke edible parts was observed until the end of the first week (5.2x107 cfu/g). Our results indicate that the enrichment of yogurts with Sardinian plant extracts can significantly improve the antioxidant activity of yogurt and in some cases the survival of its microbial flora.

Item Type:Article
ID Code:7047
Status:Published
Refereed:Yes
Uncontrolled Keywords:Antioxidant properties, microbiological characteristics, vegetable extracts, yogurt
Subjects:Area 03 - Scienze chimiche > CHIM/09 Farmaceutico tecnologico applicativo
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze del farmaco
Publisher:Chiriotti Editori
ISSN:1120-1770
Publisher Policy:Depositato per gentile concessione dell'Editore
Deposited On:28 Feb 2012 09:07

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