Chemical stability of a colorimetric indicator based on sodium alginate thin film and methylene blue dye upon active oxygen species exposure

2020 ◽  
Vol 59 (SD) ◽  
pp. SDDF09
Author(s):  
Saranya Yenchit ◽  
Hiromi Yamanaka ◽  
Pasika Temeeprasertkij ◽  
Yoshiki Oda ◽  
Osamu Kanie ◽  
...  
Keyword(s):  
Thin Film ◽  
Methylene Blue ◽  
Sodium Alginate ◽  
Chemical Stability ◽  
Active Oxygen Species ◽  
Active Oxygen ◽  
Blue Dye ◽  
Oxygen Species ◽  
Methylene Blue Dye ◽  
Colorimetric Indicator

scholarly journals Molecular Interactions between Methylene Blue and Sodium Alginate Studied by Molecular Orbital Calculations

Molecules ◽  
2021 ◽  
Vol 26 (22) ◽  
pp. 7029
Author(s):  
Pasika Temeepresertkij ◽  
Michio Iwaoka ◽  
Satoru Iwamori
Keyword(s):  
Methylene Blue ◽  
Sodium Alginate ◽  
Molecular Orbital ◽  
Molecular Interactions ◽  
Active Oxygen Species ◽  
Active Oxygen ◽  
Molecular Orbital Calculations ◽  
Oxygen Species ◽  
Computational Calculations

A methylene blue (MB) indicator embedded in sodium alginate (SA) film was previously examined for detecting active oxygen species. In a previous study, spectrometry was used to identify and characterize the MB/SA complex. However, the decolorization mechanism was not fully assessed. In this study, our aim is to conduct computational calculations at the B3LYP/6-31G(d) level to clarify the exact types and positions of the interaction that cause the decolorization in MB. The results demonstrate that MB/SA interacts with carboxylates (-COO(superscript)-(superscript)) of SA and the N, C, and S atoms of MB, confirming previous experimental observations.

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