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A new colored beverage disinfection system using UV-A light-emitting diodes
Xin Lian1, Kayo Tetsutani, Mai Katayama
1Japan Science and Technology Agency Innovation Satellite Tokushima 2-1 Minami Jyosanjima-cho, Tokushima City, Tokushima 770-8506, Japan.
UV-A-LED light shows potential for bacterial elimination in beverages. Its effectiveness against Escherichia coli decreased with higher edible pigment concentrations, but further development could enhance food and water safety applications.
Area of Science:
- Food science
- Microbiology
- Photochemistry
Background:
- Ultraviolet-A Light-Emitting Diodes (UV-A-LED) offer a novel approach to microbial inactivation.
- Colored beverages present challenges for UV-based disinfection due to light absorption by pigments.
Purpose of the Study:
- To evaluate the bactericidal efficacy of UV-A-LED technology against Escherichia coli in colored solutions.
- To determine the impact of edible pigment concentration on UV-A-LED disinfection effectiveness.
Main Methods:
- Preparation of colored solutions using ten edible pigments at varying concentrations (1.0% to 0.001%).
- Application of UV-A-LED irradiation to bacterial suspensions in colored solutions.
- Quantification of bacterial viability using colony-forming assays.
Main Results:
- UV-A-LED exhibited bactericidal activity against Escherichia coli DH5a.
- Bactericidal efficacy generally decreased as edible pigment concentration increased.
- Effectiveness was reduced in colored solutions and orange juice compared to phosphate-buffered saline (PBS).
Conclusions:
- UV-A-LED disinfection is influenced by edible pigment presence and concentration.
- While reduced in colored matrices, UV-A-LED technology shows promise for enhancing food and water safety.
- Further research is warranted to optimize UV-A-LED applications in complex food matrices.
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