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Effects of salts on rheological behaviour of salvia hydrogels

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Abstract

Rheological behavior of natural hydrogel produced from seeds of threeSalvia spp. (S. miltiorrhiza (SM),S. sclarea (SS), S.viridis (SV)) was investigated by using a Rheometer equipped with a cone and plate geometry measuring system under never-dried condition. Different chemical contents of such hydrogels give significant effects on their rheological properties. Because of incomplete penetration of water inside the hydrogels after drying before-dried hydrogels were used for rheological analysis. To know molecular interactions which predominated in the gel formation, some constituents were externally added to the 1.0% (w/w) hydrogel. Addition of urea to disrupt hydrogen bonds reduced 3.4-67% viscosity of the untreated hydrogels and changed viscoelastic properties from gel to liquid-like behavior. Neutral salts added to the hydrogel solution at 0.1 M also lowered the viscosity in a manner related with increase in size of cations and temperature. Changing from gel state to liquid-like state was also easily confirmed by oscillation measurement (storage,G′, and loss,G′⇔’, modulii) typically observed in the cases of potassium sulfate and potassium thiocyanate. Influence of pH variation on the viscosity explained that weak alkaline condition (pH 8-9) creates a higher resistance to flow due to increasingly electrostatic repulsions between negative charges (COO-). Importance of calcium bridges was also demonstrated by recovery of viscosity of the hydrogels by addition of calcium after acidification. The summarized results indicate that electrostatic repulsion is a major contributor for production of hydrogel structure.

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Authors and Affiliations

  1. Research Centre for Physics, Indonesian Institute of Sciences, Bandung, Indonesia

    Rike Yudianti & Myrtha Karina

  2. Laboratory of Forrest Biochemistry, Division of Enviromental Science, Graduate School of Agriculture, Kyoto University, Japan

    Masahiro Sakamoto & Jun-ichi Azuma

Authors
  1. Rike Yudianti
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  2. Myrtha Karina
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  3. Masahiro Sakamoto
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  4. Jun-ichi Azuma
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Correspondence to Rike Yudianti.

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Yudianti, R., Karina, M., Sakamoto, M. et al. Effects of salts on rheological behaviour of salvia hydrogels. Macromol. Res. 17, 332–338 (2009). https://doi.org/10.1007/BF03218871

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  • DOI: https://doi.org/10.1007/BF03218871

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