Rheological properties of human saliva

H.A. Waterman, C. Blom, H.J. Holterman, E.J. 's Gravenmade, J. Mellema

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Abstract

From measurements with a Couette-type viscometer provided with a guard ring it was shown that at the saliva-air interface a protein layer is adsorbed. Measurements of the surface shear modulus of this layer on saliva of 7 healthy subjects were performed at a frequency of about 70 Hz and a temperature of 25 °C. For a surface age of about 1.5 h the surface shear modulus and the surface viscosity were in the order of 1 Nm−1 and 10−3 Nm−1 s, respectively. From ellipsometric measurements it was found that the thickness of the protein layer was approx. 100nm and, using this value, it could be concluded that the shear modulus and the dynamic viscosity were in the order of 107 Pa and 104 Pa s, respectively. The layer appeared to be fragile. Even shear deformation amplitudes of 4 × 10−5 are too high to assure linearity. The complex viscosity (η = η′ − iη′′) of the bulk liquid of human submandibular saliva below the absorbed layer was measured in the frequency range 70 Hz–200 kHz with 3 torsional resonators, each for a different frequency, and a Ni-tube resonator. It was concluded, that the real part of the complex viscosity (η′) decreases from 1.1 mPa s at 70 Hz to a value of 0.95 mPa s at high frequencies. Except at the lowest frequency (70 Hz), the value of η′′ was too small to be detected.
Original languageUndefined
Pages (from-to)589-596
JournalArchives of Oral Biology
Volume33
Issue number8
DOIs
Publication statusPublished - 1988

Keywords

  • IR-70311

Cite this

Waterman, H. A., Blom, C., Holterman, H. J., 's Gravenmade, E. J., & Mellema, J. (1988). Rheological properties of human saliva. Archives of Oral Biology, 33(8), 589-596. https://doi.org/10.1016/0003-9969(88)90134-3
Waterman, H.A. ; Blom, C. ; Holterman, H.J. ; 's Gravenmade, E.J. ; Mellema, J. / Rheological properties of human saliva. In: Archives of Oral Biology. 1988 ; Vol. 33, No. 8. pp. 589-596.
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abstract = "From measurements with a Couette-type viscometer provided with a guard ring it was shown that at the saliva-air interface a protein layer is adsorbed. Measurements of the surface shear modulus of this layer on saliva of 7 healthy subjects were performed at a frequency of about 70 Hz and a temperature of 25 °C. For a surface age of about 1.5 h the surface shear modulus and the surface viscosity were in the order of 1 Nm−1 and 10−3 Nm−1 s, respectively. From ellipsometric measurements it was found that the thickness of the protein layer was approx. 100nm and, using this value, it could be concluded that the shear modulus and the dynamic viscosity were in the order of 107 Pa and 104 Pa s, respectively. The layer appeared to be fragile. Even shear deformation amplitudes of 4 × 10−5 are too high to assure linearity. The complex viscosity (η = η′ − iη′′) of the bulk liquid of human submandibular saliva below the absorbed layer was measured in the frequency range 70 Hz–200 kHz with 3 torsional resonators, each for a different frequency, and a Ni-tube resonator. It was concluded, that the real part of the complex viscosity (η′) decreases from 1.1 mPa s at 70 Hz to a value of 0.95 mPa s at high frequencies. Except at the lowest frequency (70 Hz), the value of η′′ was too small to be detected.",
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Waterman, HA, Blom, C, Holterman, HJ, 's Gravenmade, EJ & Mellema, J 1988, 'Rheological properties of human saliva', Archives of Oral Biology, vol. 33, no. 8, pp. 589-596. https://doi.org/10.1016/0003-9969(88)90134-3

Rheological properties of human saliva. / Waterman, H.A.; Blom, C.; Holterman, H.J.; 's Gravenmade, E.J.; Mellema, J.

In: Archives of Oral Biology, Vol. 33, No. 8, 1988, p. 589-596.

Research output: Contribution to journalArticleAcademic

TY - JOUR

T1 - Rheological properties of human saliva

AU - Waterman, H.A.

AU - Blom, C.

AU - Holterman, H.J.

AU - 's Gravenmade, E.J.

AU - Mellema, J.

PY - 1988

Y1 - 1988

N2 - From measurements with a Couette-type viscometer provided with a guard ring it was shown that at the saliva-air interface a protein layer is adsorbed. Measurements of the surface shear modulus of this layer on saliva of 7 healthy subjects were performed at a frequency of about 70 Hz and a temperature of 25 °C. For a surface age of about 1.5 h the surface shear modulus and the surface viscosity were in the order of 1 Nm−1 and 10−3 Nm−1 s, respectively. From ellipsometric measurements it was found that the thickness of the protein layer was approx. 100nm and, using this value, it could be concluded that the shear modulus and the dynamic viscosity were in the order of 107 Pa and 104 Pa s, respectively. The layer appeared to be fragile. Even shear deformation amplitudes of 4 × 10−5 are too high to assure linearity. The complex viscosity (η = η′ − iη′′) of the bulk liquid of human submandibular saliva below the absorbed layer was measured in the frequency range 70 Hz–200 kHz with 3 torsional resonators, each for a different frequency, and a Ni-tube resonator. It was concluded, that the real part of the complex viscosity (η′) decreases from 1.1 mPa s at 70 Hz to a value of 0.95 mPa s at high frequencies. Except at the lowest frequency (70 Hz), the value of η′′ was too small to be detected.

AB - From measurements with a Couette-type viscometer provided with a guard ring it was shown that at the saliva-air interface a protein layer is adsorbed. Measurements of the surface shear modulus of this layer on saliva of 7 healthy subjects were performed at a frequency of about 70 Hz and a temperature of 25 °C. For a surface age of about 1.5 h the surface shear modulus and the surface viscosity were in the order of 1 Nm−1 and 10−3 Nm−1 s, respectively. From ellipsometric measurements it was found that the thickness of the protein layer was approx. 100nm and, using this value, it could be concluded that the shear modulus and the dynamic viscosity were in the order of 107 Pa and 104 Pa s, respectively. The layer appeared to be fragile. Even shear deformation amplitudes of 4 × 10−5 are too high to assure linearity. The complex viscosity (η = η′ − iη′′) of the bulk liquid of human submandibular saliva below the absorbed layer was measured in the frequency range 70 Hz–200 kHz with 3 torsional resonators, each for a different frequency, and a Ni-tube resonator. It was concluded, that the real part of the complex viscosity (η′) decreases from 1.1 mPa s at 70 Hz to a value of 0.95 mPa s at high frequencies. Except at the lowest frequency (70 Hz), the value of η′′ was too small to be detected.

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M3 - Article

VL - 33

SP - 589

EP - 596

JO - Archives of Oral Biology

JF - Archives of Oral Biology

SN - 0003-9969

IS - 8

ER -

Waterman HA, Blom C, Holterman HJ, 's Gravenmade EJ, Mellema J. Rheological properties of human saliva. Archives of Oral Biology. 1988;33(8):589-596. https://doi.org/10.1016/0003-9969(88)90134-3