Effect of photoinitiator and binder concentration on color of methylene blue-based oxygen indicator
Conference proceedings article
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Publication Details
Author list: Suwannawatanamatee K., Mingvanish W., Yiangkamolsing C., Tanprasert K.
Publisher: Hindawi
Publication year: 2014
Start page: 98
End page: 105
Number of pages: 8
ISBN: 9781510821316
eISSN: 1745-4557
Languages: English-Great Britain (EN-GB)
Abstract
Oxygen indicator is one of the mechanism to ensure that the low oxygen concentration in headspace is maintained. Oxygen indicator based-on methylene blue is effective and being used commercially in the tablet form. The oxygen indicator system consists of methylene blue, photoinitiator and binder. In this study, the objective was to evaluate the effect of methylene blue (redox dye) and 2,2-dimethoxy-2-phenyl acetophenone-benzyl dimethyl ketal (photoinitiator) on the color of the film formed using methylcellulose. Methylene blue concentration (with constant BDK concentration at 0.7%) affected the color of the film before and after UV irradiation as well as the color difference. The lower methylene blue concentration resulted in lighter film that reach its maximum color difference the fastest both for UV irradiation and oxygen exposure steps. MB concentration did not have effect on the magnitude of color difference in the range of 0.021-0.049% BDK concentration (with constant MB concentration at 0.021%) had less obvious effect on the color of the film before and after UV irradiation than MB concentration did. Film with 0.35% BDK required the least time to reach saturated color difference point but its magnitude of color difference were slightly (but significantly) less than that of film with 0.7 and 1.4% BDK. BDK concentration in the range of 0.35-1.4% had no effect on film color difference.
Keywords
BDK, Methylcellulose, Oxygen indicator
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