Imperial College London

Dr Tom Reddyhoff

Faculty of EngineeringDepartment of Mechanical Engineering

Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 3840t.reddyhoff Website

 
 
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Location

 

670City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Carpenter:2019:10.1016/j.foodhyd.2019.01.049,
author = {Carpenter, G and Bozorgi, S and Vladescu, S and Forte, A and Myant, C and Potineni, R and Reddyhoff, T and Baier, S},
doi = {10.1016/j.foodhyd.2019.01.049},
journal = {Food Hydrocolloids},
pages = {10--18},
title = {A study of saliva lubrication using a compliant oral mimic},
url = {http://dx.doi.org/10.1016/j.foodhyd.2019.01.049},
volume = {92},
year = {2019}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - Due to ethical issues and the difficulty in obtaining biological tissues, it is important to find synthetic elastomers that can be used as replacement test media for research purposes. An important example of this is friction testing to understand the mechanisms behind mouthfeel attributes during food consumption (e.g. syrupy, body and clean finish), which requires an oral mimic. In order to assess the suitability of possible materials to mimic oral surfaces, a sliding contact is produced by loading and sliding a hemispherical silica pin against either a polydimethyl siloxane (PDMS), agarose, or porcine tongue sample. Friction is measured and elastohydrodynamic film thickness is calculated based on the elastic modulus of the samples, which is measured using an indentation method. Tests were performed with both saliva and pure water as the lubricating fluid and results compared to unlubricated conditions.PDMS mimics the tongue well in terms of protein adhesion, with both samples showing significant reductions in friction when lubricated with saliva versus water, whereas agarose showed no difference between saliva and water lubricated conditions. This is attributed to PDMS's OSi(CH3)2- group which provides excellent adhesion for the saliva protein molecules, in contrast with the hydrated agarose surface. The measured modulus of the PDMS (2.2MPa) is however significantly greater than that of tongue (3.5kPa) and agarose (66–174kPa). This affects both the surface (boundary) friction, at low sliding speeds, and the entrained elastohydrodynamic film thickness, at high speeds.Utilising the transparent PDMS sample, we also use fluorescence microscopy to monitor the build-up and flow of dyed-tagged saliva proteins within the contact during sliding. Results confirm the lubricous boundary film forming nature of saliva proteins by showing a strong correlation between friction and average protein intensity signals (cross correlation coefficient=0.87). This demonstrates
AU - Carpenter,G
AU - Bozorgi,S
AU - Vladescu,S
AU - Forte,A
AU - Myant,C
AU - Potineni,R
AU - Reddyhoff,T
AU - Baier,S
DO - 10.1016/j.foodhyd.2019.01.049
EP - 18
PY - 2019///
SN - 0268-005X
SP - 10
TI - A study of saliva lubrication using a compliant oral mimic
T2 - Food Hydrocolloids
UR - http://dx.doi.org/10.1016/j.foodhyd.2019.01.049
UR - https://www.sciencedirect.com/science/article/pii/S0268005X1831885X
UR - http://hdl.handle.net/10044/1/67212
VL - 92
ER -