Effect of water activity on the crispiness of a biscuit (Crackerbread): Mechanical and acoustic evaluation

Autor:	E. Duggan, Michael O'Sullivan, E.D. O’Riordan, James G. Lyng, J.M. Arimi
Rok vydání:	2010
Předmět:	geography Universal testing machine geography.geographical_feature_category Water activity Chemistry Acoustics Computer software Labview software Cereal product Mineralogy Sound (geography) Food Science Audio frequency
Zdroj:	Food Research International. 43:1650-1655
ISSN:	0963-9969
DOI:	10.1016/j.foodres.2010.05.004
Popis:	The objective of this study was to use mechanical and acoustic methods developed in our laboratory to monitor the changes in crispiness of a Crackerbread biscuit following equilibration at different water activities ( a w ). Crackerbread samples were equilibrated at a w of 0.113–0.98. The equilibrated Crackerbread samples were punctured with a cylindrical probe (5 mm) using an Instron Universal Testing Machine. The force and acoustic signals were simultaneously captured using Labview software. Changes in parameters associated with crispiness were modelled using Fermi’s equation. The number of sound peaks, force and sound curve lengths and area under sound amplitude–time curve decreased with increasing a w . The sound frequency decreased linearly ( R 2 = 0.926) with increasing a w . The critical water activity ( a wc ) of Crackerbread ranged between 0.51 and 0.59. Acoustic parameters were more sensitive to a w -induced changes in Crackerbread occurring at a wc than mechanical parameters.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0c37fd6c6b83c6ed2dc48f7f77d8f554 https://doi.org/10.1016/j.foodres.2010.05.004 Zobrazit plný text záznamu Full Text from ScienceDirect