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Water droplet surface tension method - An innovation in quantifying saponin content in quinoa seed


Yousif, AM and Snowball, R and D'Antuono, MF and Dhammu, Harmohinder S and Sharma, Darshan L, Water droplet surface tension method - An innovation in quantifying saponin content in quinoa seed, Food Chemistry Article 128483. ISSN 0308-8146 (2020) [Refereed Article]

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Crown Copyright © 2020 Published by Elsevier Ltd.

DOI: doi:10.1016/j.foodchem.2020.128483


Quinoa surface borne saponins are bitter tasting anti-nutritional compounds that must be removed before consumption of the seed. To determine saponin content, the currently available standard afrosimetric foam test method only determines the presence of saponin via a rating of either ‘acceptable’ or ‘unacceptable’. A water droplet surface tension (WDST) based innovative method was developed that can quantify saponin content in aqueous solutions with greater accuracy. The method comprised four steps: solution preparation, droplet creation, image capture and image analysis using Axisymmetric Drop Shape Analysis computer software. The method applied satisfactorily to saponin content up to 0.2−1 as higher concentrations did not further reduce the surface tension. Results demonstrated that saponin concentration may be measured in the range 0.05 to 0.15−1 (0.05 – 0.15% saponin by weight of seed). Validation of the WDST method on commercial and experimental samples offers quinoa processors an accurate inexpensive way of measuring saponin concentration to satisfy current seed quality specifications.

Item Details

Item Type:Refereed Article
Keywords:quinoa, saponin, water droplet surface tension, afrosimetric foam test, axisymmetric drop shape analysis, quinoa seed quality
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Food sciences
Research Field:Food technology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the agricultural, food and veterinary sciences
UTAS Author:Yousif, AM (Dr Adel Yousif)
ID Code:141764
Year Published:2020
Deposited By:Agriculture and Food Systems
Deposited On:2020-11-17
Last Modified:2020-12-17

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