| Colour evaluation of a phycobiliprotein-rich extract obtained from Nostoc PCC9205 in acidic solutions and yogurt. | |
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MedLine Citation:
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PMID: 22095681 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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BACKGROUND: Phycobiliproteins are coloured proteins produced by cyanobacteria, which have several applications because of their colour properties. However, there is no available information about the colour stability of phycobiliproteins from Nostoc sp. in food systems. The aim of this work was to study the colour stability of a purple-coloured phycobiliprotein-rich extract from the cyanobacterium Nostoc PCC9205 in acidic solutions and yogurt. RESULTS: Variations of pH for Nostoc PCC9205 extract have shown stability for the L* (lightness) and a* (redness) indexes in the range 1.0-7.0. The b* index (blueness), however, increased at pH values below 4.0, indicating loss of the blue colour. The Nostoc PCC9205 extract was used as colorant in yogurt (pH 4.17) stored for 60 days. Instrumental colour analysis showed no changes for the L* and a* indexes during storage, whereas the b* index changed after 20 days of storage. A multiple comparison test showed colour instability after 20 days of storage. A hedonic scale test performed on the 60th day of storage showed acceptability of the product. CONCLUSIONS: The red component of the phycobiliprotein-rich extract from Nostoc PCC9205 presented an improved stability in acidic media and yogurt compared with the blue component of this extract. Copyright © 2011 Society of Chemical Industry. |
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Authors:
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Isabela de O Moreira; Thaís S Passos; Claudete Chiapinni; Gabrielle K Silveira; Joana Cm Souza; Luis Guillermo Coca-Vellarde; Rosires Deliza; Kátia G de Lima Araújo |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-9-23 |
Journal Detail:
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Title: Journal of the science of food and agriculture Volume: - ISSN: 1097-0010 ISO Abbreviation: - Publication Date: 2011 Sep |
Date Detail:
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Created Date: 2011-11-18 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0376334 Medline TA: J Sci Food Agric Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Society of Chemical Industry. |
Affiliation:
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Departamento de Bromatologia, Faculdade de Farmácia, Universidade Federal Fluminense, Rio de Janeiro, Brazil. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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