Nasal mucus, 15 mucoid and 15 mucopurulent mucus, were obtained by direct sampling from the nasal cavity of the patients with chronic sinusitis. The rheological properties of the mucus samples were determined using an oscillating sphere magnetic rheometer developed in our laboratory. Both elastic modulus G' and loss modulus G" (dynamic viscosity η') were measured at the frequency of 1.1, 10.7, 106.8 and 125.6radians/sec. Both mucoid and mucopurulent mucus showed an increase in G' with increasing frequency, and a decrease in η' over the frequency range studied. The type of variation in G'and η' with frequency is similar to that seen viscoelastic materials.
In mucoid mucus, G' at 1.1, 10.7, 106.8 and 125.6radians/sec was 3.98±0.63, 6.22±1.01, 6.00±1.12 and 12.30±6.04dyn/cm2 respectively. In mucopurulent mucus, G' at 1.1, 10.7, 106.8 and 125.6radians/sec was 11.09±1.49, 24.14±4.48, 44.31±9.10 and 55.23±11.33dyn/cm2 respectively. In mucoid mucus, G" at 1.1, 10.7, 106.8, and 125.6radians/sec was 5.23±1.12, 7.20±1.11, 14.30±4.56 and 10.96±2.98dyn/cm2 respectively. In mucopurulent mucus, G" at 1.1, 10.7, 106.8 and 125.6radians/sec was 11.11±1.52, 12.35±2.05, 40.25±7.00 and 47.16±9.29dyn/cm2 respectively. Both G' and G" in mucopurulent mucus were significantly higher than those in mucoid mucus, G"/G' in mucoid mucus was significantly higher than that in mucopurulent mucus at 1.1, 10.7 and 106.8radians/sec. These results indicated that mucopurulent mucus is more viscous and elastic than mucoid mucus over the frequency range studied.
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