(19)

(11)

EP 4 093 903 A1

(12)

(43) Date of publication: 30.11.2022 Bulletin 2022/48 (21) Application number: 21712207.6 (22) Date of filing: 25.01.2021

(51) International Patent Classification (IPC):  C25B 1/26(2006.01) C25B 11/052(2021.01) C25B 11/081(2021.01) C02F 1/467(2006.01) C25B 9/65(2021.01) C25B 11/067(2021.01) C02F 1/46(2006.01) G01N 21/15(2006.01) (52) Cooperative Patent Classification (CPC): C25B 1/26; C25B 11/052; C25B 11/067; C25B 11/081; C25B 9/65; C02F 1/4602; C02F 1/4674; G01N 21/15; C02F 2303/20; C02F 2303/14; C02F 2103/08; C02F 2001/46142 (86) International application number: PCT/IB2021/050549 (87) International publication number: WO 2021/149024 (29.07.2021 Gazette 2021/30)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 24.01.2020 PT 2020116075 (71) Applicant: Universidade do Minho 4704-553 Braga (PT)	(72) Inventors: HENRIQUES MINAS, Graça Maria 4710-588 Adaúfe (PT) VALENTE GONÇALVES, Luís Miguel 4715-404 Braga (PT) GONÇALVES PINTO, Vânia Cristina 4705-769 Braga (PT) TEIXEIRA DE SOUSA, Paulo Jorge 4705-769 Braga (PT) (74) Representative: Patentree  Edificio Net Rua de Salazares, 842 4149-002 Porto 4149-002 Porto (PT)