Journal of Food Measurement and Characterization

, Volume 13, Issue 3, pp 1636–1644 | Cite as

Characterization of heat-moisture treated Dioscorea alata purpurea flour: impact of moisture level

  • Nor Afizah MustaphaEmail author
  • Siti Nadrah Huda Roslen
  • Faatimah Shameemah Abd Gafar
  • Wan Zunairah Wan Ibadullah
  • Radhiah Sukri
Original Paper


Dioscorea alata purpurea (purple yam) is a seasonal yam that is not commercially exploited due to its undesirable characteristics; having high pasting temperature and forming a soft, sticky and uncohesive texture. Hydrothermal modification could improve the physicochemical properties of the yam flour. The effect of moisture level (20, 25, and 30%, w/w) during heat-moisture treatment (HMT) of D. alata flour at 105 °C for 24 h on amylose content, thermal properties, swelling power and carbohydrate leaching were investigated. Increasing moisture level during HMT slightly decreased amylose content and gelatinization enthalpy, while significantly increased the gelatinization temperatures of the flour. Heat-moisture treated flour exhibited reduced carbohydrate leaching and limited starch granule swelling when heated at 55 to 95 °C, compared to the native flour. The enhancement of starch granule rigidity, rearrangement of amylose and amylopectin and interactions between starch and non-starch components are proposed as the factors contributing to the changes observed in the HMT D. alata flours. Moisture content during HMT play a significant role by acting as plasticizer in assisting mobility of starch components. In conclusion, the results highlight the feasibility of utilizing heat-moisture treated D. alata flour in products requiring high thermal stability and low cooking loss.


Carbohydrate leaching Dioscorea alata purpurea Gelatinization temperatures Heat-moisture treatment Swelling 



This research study was financially supported by Fundamental Research Grant Scheme (FRGS) with grant number FRGS/1/2016/STG01/UPM/02/1 awarded by Ministry of Higher Education (MOHE) Malaysia.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.


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Authors and Affiliations

  1. 1.Faculty of Food Science and TechnologyUniversiti Putra MalaysiaSerdangMalaysia
  2. 2.Halal Product Research InstituteUniversiti Putra MalaysiaSerdangMalaysia
  3. 3.Department of Food Technology, Faculty of Food Science and TechnologyUniversiti Putra MalaysiaSerdangMalaysia

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