The study presents a colorimetric platform based on the enzyme-substrate system for detecting oxygen leaks in packaging materials. The system is based on the oxidation of 2,2'-azino-bis(3-ethylbenzothiasoline-6-sulfonic acid) (ABTS) by laccase to form the colored radical cation ABTS•⁺. Humic acids (HAs) act as natural modulators. It was found that an increase in the concentration of HAs from 0 to 0.05 % reduces the initial reaction rate by 97 %. The color response and response time of the system are determined by the concentration of the modulator – from green (minutes) to brown (24 hours). The obtained results demonstrate a great opportunity of the system as a colorimetric platform with a tunable response time.

Крайнова Д.В., Ионов Я.А. (науч. рук. Назарова Е.А.) A humic acid–laccase system as a tunable colorimetric platform for food packaging integrity indicators // Сборник тезисов докладов конгресса молодых ученых. Электронное издание. – СПб: Университет ИТМО, [2026]. URL: https://kmu.itmo.ru/digests/article/17255