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Aluminum based reflective nanolens arrays to improve the effectiveness of ultraviolet inactivation of Escherichia coli O157:H7 and Listeria monocytogenes in water and a sucrose solution

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Abstract

Aluminum based reflective nanolens arrays were developed via a series of aluminum electropolishing and anodization steps with subsequent selective dissolution of anodic aluminum oxide (AAO). The diameter of nanolenses (d) on arrays can be controlled by altering electrolytes and voltages used for aluminum anodization. The d values of arrays produced by anodization in 0.3 M oxalic acid at 40, 60, and 80 V, and in 1.0 M phosphoric acid at 100, 110, and 120 V were 71.94, 121.90, and 161.53 nm, and 220.16, 252.06, and 274.78 nm, respectively. The effectiveness of UV (254 nm) inactivation of Escherichia coli O157:H7 and Listeria monocytogenes at concentrations of 5–6 log CFU/mL in water and in a 10% (w/v) sucrose solution was improved using a nanolens array having a d value of 252.06 nm.

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Acknowledgments

This study was supported by a grant from the National Research Foundation of Korea (NRF-2016R1A2B1012571) funded by the Korean government.

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  1. Department of Applied Animal Science, Kangwon National University, Chuncheon, 24341, Republic of Korea

    Junsoo Park & Changhoon Chai

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  1. Junsoo Park
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  2. Changhoon Chai
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Correspondence to Changhoon Chai.

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Conflict of interest

The nanolens array manufactured and used for this report is protected by Korea patent filing serial number ‘10-2018-0106899’, “Ultraviolet sterilizing apparatus using a lens array,” filed Sep 7, 2018. This does not alter author adherence to all Food Science and Biotechnology policies regarding sharing data and materials.

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Fig. S1. Experimental setups for ultraviolet (UV) inactivation.(TIFF 2221 kb)

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Park, J., Chai, C. Aluminum based reflective nanolens arrays to improve the effectiveness of ultraviolet inactivation of Escherichia coli O157:H7 and Listeria monocytogenes in water and a sucrose solution. Food Sci Biotechnol 29, 1281–1287 (2020). https://doi.org/10.1007/s10068-020-00765-z

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  • DOI: https://doi.org/10.1007/s10068-020-00765-z

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