Operational Considerations FOR HOT-washing in Potato CrispManufacture

Leanne Bartlett, Gary Montague (Lead / Corresponding author), Ged McNamara, Ben Davies, Alberto Fiore, Keith Sturrock, Moira Ledbetter, Ingo Hein, Sophie Mantelin, Brian Harrower, Stan Higgins, Karen Stott

Research output: Contribution to journalArticle


As part of an overall programme aimed at reducing the acrylamide content of crisps, this paper explores the impact of hot-washing on potato slice sugar concentration during industrial scale manufacture. We investigated cold-washing as an alternative to hot-washing, hot-wash residence time and temperature to optimise sugar removal and therefore reduce the potential for high acrylamide levels after frying. Due to the variable nature of potatoes, an extensive variability study was performed to determine confidence boundaries of results. It was found that the cold-wash unit removed on average 21% of the initial sugar content. In the hot-wash the current operational residence time of 3.5 minutes at 70oC gave a sugar reduction of 27.5%, which could be increased to 48.5% if residence time is extended to 5 minutes. Hot-wash temperatures of 40oC - 60oC were found to increase glucose and fructose content and therefore the potential for acrylamide formation. A “double cold-wash” was trialled and proved to be as successful as hot-washing at 70oC for all but the highest sugar potatoes, challenging the current operational process and offering the potential for major energy savings.
Original languageEnglish
Pages (from-to)387-396
Number of pages10
JournalFood and Bioproducts Processing
Early online date1 Oct 2020
Publication statusE-pub ahead of print - 1 Oct 2020


  • Crisp Manufacture
  • Blanching
  • Reducing Sugars
  • Food Processing
  • Acrylamide

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    Bartlett, L., Montague, G., McNamara, G., Davies, B., Fiore, A., Sturrock, K., Ledbetter, M., Hein, I., Mantelin, S., Harrower, B., Higgins, S., & Stott, K. (2020). Operational Considerations FOR HOT-washing in Potato CrispManufacture. Food and Bioproducts Processing, 124, 387-396. https://doi.org/10.1016/j.fbp.2020.09.014