MECHANICAL AND RHEOLOGY PROPERTIES OF DEHYDRATED FRUITS

摘要：

　　Dried fruits that have good taste,modified texture and look appetizing are highly demanded by consumers.The texture of dried fruits can be determined using two basic groups of instrumental tests i.e.mechanical and rheological.Mechanical properties are usually determined through compressive test,sometimes through cutting test and very rarely using three point bending test.Those tests provide information on breaking force and energy that required in breaking a sample.Compression of the sample with defined size enables determination of breaking stress and modulus of elasticity,whereas double compression,known as a Texture Profile Analysis (TPA),reflects the behaviour of a material while masticating.Parameters used to quantify the masticating behaviour are hardness,cohesiveness,springiness,adhesiveness,chewiness and gumminess,which are also corresponding to the quality attributes evaluated in sensory assessment.Rheological properties of dehydrated fruits are also key criteria in determining product quality and measuring consumer’s acceptance of a product during masticating.These properties are measured through stress relaxation or creeping tests,which provide insights into viscoelastic characteristic of dehydrated fruits.This paper provides an overview on the mechanical and rheology properties of fruits dried using different drying methods.In addition,the Maxwell model,the Kelvin-Viogt model,the standard linear solid model and the Generalized Maxwell model are used to predict the stress and strain interactions in time as well as the temporal dependencies on temperature and moisture content are discussed.

关键词： Mechanical properties Rheology properties Dehydrated fruit Modelling Texture

作者: Chien Hwa Chong Adam Figiel Chung Lim Law

作者单位: School of Engineering,Taylors University,No 1,Jalan Taylor‘s,47500 Subang Jaya,Selangor,Malaysia Institute of Agricultural Engineering,Wroclaw University of Environmental and Life Sciences Chelmons Faculty of Chemical and Environmental Engineering,The University of Nottingham,Malaysia Campus,Broga

会议类型: 国际会议

会议名称: The 18th International Drying Symposium Conference(第十八届国际干燥学术大会(IDS2012))

会议地点: 厦门

会议语种:英文

页码: 1-11

在线出版日期: 2012-01-11（万方平台首次上网日期，不代表论文的发表时间）