4 Tekstilec, 2020, 63(1), 4-13 DOI: 10.14502/Tekstilec2020.63.4-13 Corresponding author/Korespondenčna avtorica: Prof dr. Barbara Simončič E-mail: barbara.simoncic@ntf.uni-lj.si Jana Filipič, Dominika Glažar, Špela Jerebic, Daša Kenda, Anja Modic, Barbara Roškar, Iris Vrhovski, Danaja Štular, Barbara Golja, Samo Smolej, Brigita Tomšič, Marija Gorjanc, Barbara Simončič University of Ljubljana, Faculty of Natural Sciences and Engineering, Aškerčeva 12, 1000 Ljubljana, Slovenia Tailoring of Antibacterial and UV-protective Cotton Fabric by an in situ Synthesis of Silver Particles in the Presence of a Sol-gel Matrix and Sumac Leaf Extract Izdelava protibakterijske in UV zaščitne bombažne tkanine z in situ sintezo srebrovih delcev v prisotnosti sol-gel matrice in ekstrakta listov octovca Original scientifc article/Izvirni znanstveni članek Received/Prispelo 10-2018 • Accepted/Sprejeto 12-2019 Abstract This research presents a new procedure for the chemical modification of cotton fabric, which included a ‘’green’’ in situ synthesis of silver particles using an extract of sumac leaves as a reducing agent. To increase the adsorption ability of silver cations, a sol-gel matrix was previously created on cotton fabric using an or- ganic–inorganic precursor sol-gel. The presence of silver particles on the cotton fabric was confirmed by scanning electron microscopy and energy-dispersive X-ray spectroscopy. The results showed that silver par- ticles were created on the cotton fabric in the presence of the sumac leaf extract, which colored the fibers in brown. The presence of the sol-gel matrix increased the adsorption of silver cations and therefore the concentration of sliver particles, which resulted in a deeper color yield. Silver particles provided antibacte- rial protection, with a 99–100% reduction of E. coli in S. aureus bacteria, while the sumac leaf extract provid- ed excellent protection against ultraviolet radiation, with an ultraviolet protective factor equaling 66.54. The coating was also highly durable in terms of its washing fastness. Keywords: silver particles, in situ synthesis, sumac leaves, cotton, sol-gel matrix, antibacterial activity, UV-pro- tection Izvleček V raziskavi je predstavljen nov postopek kemijske modifikacije bombažne tkanine, ki vključuje »zeleno« in situ sin- tezo srebrovih delcev z uporabo ekstrakta listov octovca kot reducenta. Za povečanje stopnje adsorpcije srebrovih kationov je bila na bombažni tkanini predhodno oblikovana sol-gel matrica z uporabo reaktivnega organskega- anorganskega hibridnega prekurzorja. Vzorci bombažne tkanine so bili potopljeni v raztopno AgNO 3 pri ustreznih pogojih, v njo pa je bil naknadno dodan ekstrakt octovca. Po obdelavi je bila tkanina večkrat prana. Prisotnost sre- brovih delcev na bombažni tkanini je bila potrjena z vrstično elektronsko mikroskopijo z energijsko-disperzijsko spektroskopijo rentgenskih žarkov. Iz rezultatov raziskave je razvidno, da so se v prisotnosti ekstrakta listov octov- ca na bombažni tkanini oblikovali srebrovi delci, ki so vlakna obarvali v rjavem barvnem tonu. Prisotnost sol-gel matrice je povečala adsorpcijo srebrovih kationov ter s tem koncentracijo srebrovih delcev, kar se je odrazilo v te- mnejšem barvnem tonu. Srebrovi delci so podelili tkanini protibakterijsko zaščito z 99–100-odstotno redukcijo bak- terij E. coli in S. aureus, prisotnost ekstrakta listov octovca pa je nudila odlično zaščito pred ultravijoličnim seva- njem z ultravijoličnim zaščitnim faktorjem enakim 66,54. Apretura je bila visoko pralno obstojna. Ključne besede: srebrovi delci, in situ sinteza, listi octovca, bombaž, sol-gel matrica, protimikrobna aktivnost, UV zaščita