IADR Abstract Archives
High Dispersibility of the New Toothpastes with Rheological Measurements
Objectives: Quantification of the perception of texture and satisfaction when a toothpaste is applied would be highly beneficial in developing toothpaste that the users would delight in. Under the assumption that the increased dispersibility of toothpaste in the mouth leads to its better impression, this study is focused on studying the correlation between texture and rheological data and verifying whether release kinetics of the active ingredients from toothpastes are relevant to the dispersibility.
Methods: (1)Rheological Study: Flow test, oscillation test, and creep-recovery test were done by a rotational rheometer using AVON Whitening Essentials, Himalaya Pink Salt Pumping and LG regular toothpaste.
(2)Release Kinetic Study of Active Ingredient: Weigh 1g of toothpaste in a beaker and add 100mL water and stir the solution with a magnetic bar at 350 rpm. Take 20mL of solution at 10sec, 20sec and 30sec from the beaker and add 20mL of buffer solution. Released fluoride concentration was measured by fluoride electrode.
Results: Three toothpastes were studied by a rheometer. Viscosity at low shear rate, yield stress and phase angle were related to dispersibility of toothpaste. When phase angle is increased, viscosity at low shear rate(0.1s-1) is decreased, and yield stress is decreased, the toothpaste showed good dispersibility. From these experimental results, AVON Whitening Essentials showed outstanding dispersibility, and the second was Himalaya Pink Salt Pumping toothpaste. Both of them are superior to our regular toothpaste in terms of dispersibility.
Kinetic study of fluoride release showed that fluoride concentration from AVON Whitening Essentials was highest and the second was Himalaya Pink Salt Pumping at 30sec.
Conclusions: AVON Whitening Essentials and Himalaya Pink Salt Pumping have outstanding dispersibility than LG regular toothpaste. Most importantly, we verified that the active ingredient release kinetics is related to dispersibility of toothpaste.
Methods: (1)Rheological Study: Flow test, oscillation test, and creep-recovery test were done by a rotational rheometer using AVON Whitening Essentials, Himalaya Pink Salt Pumping and LG regular toothpaste.
(2)Release Kinetic Study of Active Ingredient: Weigh 1g of toothpaste in a beaker and add 100mL water and stir the solution with a magnetic bar at 350 rpm. Take 20mL of solution at 10sec, 20sec and 30sec from the beaker and add 20mL of buffer solution. Released fluoride concentration was measured by fluoride electrode.
Results: Three toothpastes were studied by a rheometer. Viscosity at low shear rate, yield stress and phase angle were related to dispersibility of toothpaste. When phase angle is increased, viscosity at low shear rate(0.1s-1) is decreased, and yield stress is decreased, the toothpaste showed good dispersibility. From these experimental results, AVON Whitening Essentials showed outstanding dispersibility, and the second was Himalaya Pink Salt Pumping toothpaste. Both of them are superior to our regular toothpaste in terms of dispersibility.
Kinetic study of fluoride release showed that fluoride concentration from AVON Whitening Essentials was highest and the second was Himalaya Pink Salt Pumping at 30sec.
Conclusions: AVON Whitening Essentials and Himalaya Pink Salt Pumping have outstanding dispersibility than LG regular toothpaste. Most importantly, we verified that the active ingredient release kinetics is related to dispersibility of toothpaste.
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