Relationship between Apparent Viscosity and Line-Spread Test Measurement of Thickened Fruit Juices Prepared with a Xanthan Gum-based Thickener

  • Received : 2014.06.11
  • Accepted : 2014.07.03
  • Published : 2014.09.30


The flow behaviors of three thickened fruit juices (orange, apple, and grape juice) prepared with a commercial instant xanthan gum (XG)-based thickener that is marketed in Korea were investigated at different thickener concentrations (1.0%, 1.5%, 2.0%, 2.5%, 3.0%, and 3.5%) and setting times (5 and 30 min) using a rheometer and a line-spread measurement method. The flow distance values measured by the line-spread test (LST) were compared with the apparent viscosity (${\eta}_{a,50}$) values measured with a sophisticated computer-controlled rheometer. The ${\eta}_{a,50}$ values of the juices increased as thickener concentration increased, whereas their flow distances decreased. The ${\eta}_{a,50}$ values at the 30-min setting time were much higher than those at the 5-min setting time, indicating that the setting time before serving or consuming thickened juices can affect viscosity values. Plots comparing ${\eta}_{a,50}$ values to LST flow distances revealed strong exponential relationships between the two measures ($R^2$=0.989 and $R^2$=0.987 for the 5- and 30-min setting times, respectively). These results indicate that the LST can be a suitable instrument for evaluating the viscosity of thickened fruit juices prepared with different XG-based thickener concentrations and setting times for the dysphagia diet.


  1. Matta Z, Chambers E 4th, Mertz Garcia J, McGowan Helverson JM. 2006. Sensory characteristics of beverages prepared with commercial thickeners used for dysphagia diets. J Am Diet Assoc 106: 1049-1054.
  2. Nicosia MA, Robbins J. 2007. The usefulness of the line spread test as a measure of liquid consistency. Dysphagia 22: 306-311.
  3. Seo CW, Yoo BS. 2013. Steady and dynamic shear rheological properties of gum-based food thickeners used for diet modification of patients with dysphagia: effect of concentration. Dysphagia 28: 205-211.
  4. Adeleye B, Rachal C. 2007. Comparison of the rheological properties of ready-to-serve and powdered instant foodthickened beverages at different temperatures for dysphagic patients. J Am Diet Assoc 107: 1176-1182.
  5. Budke J, Garcia JM, Chambers E 4th. 2008. Comparisons of thickened beverages using line spread measurements. J Am Diet Assoc 108: 1532-1535.
  6. Sopade PA, Halley PJ, Cichero JAY, Ward LC. 2007. Rheological characterisation of food thickeners marketed in Australia in various media for the management of dysphagia. I: water and cordial. J Food Eng 79: 69-82.
  7. Payne C, Methven L, Fairfield C, Bell A. 2011. Consistently inconsistent: commercially available starch-based dysphagia products. Dysphagia 26: 27-33.
  8. Lotong V, Chun SS, Chambers E 4th, Garcia JM. 2003. Texture and flavor characteristics of beverages containing commercial thickening agents for dysphagia diets. J Food Sci 68: 1537-1541.
  9. Mann LL, Wong K. 1996. Development of an objective method for assessing viscosity of formulated foods and beverages for the dysphagic diet. J Am Diet Assoc 96: 585-588.
  10. Paik NJ, Han TR, Park JW, Lee EK, Park MS, Hwang IK. 2004. Categorization of dysphagia diets with the line spread test. Arch Phys Med Rehabil 85: 857-861.
  11. Garcia JM, Chambers E 4th, Matta Z, Clark M. 2005. Viscosity measurements of nectar- and honey-thick liquids: product, liquid, and time comparisons. Dysphagia 20: 325-335.
  12. Cho HM, Yoo WC, Yoo BS. 2012. Steady and dynamic rheological properties of thickened beverages used for dysphagia diets. Food Sci Biotechnol 21: 1775-1779.

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