Inspired by nature: Fiber networks functionalized with tannic acid and condensed tannin-rich extracts of Norway spruce bark show antimicrobial efficacy

• DOI: 10.3389/fbioe.2023.1171908
• Publication Date: 2023-04-19T04:53:56Z
• Authors: Tuula Jyske; Jaana Liimatainen; Jenni Tienaho; Hanna Brännström; Dan Aoki; Katsushi Kuroda; Dhanik Reshamwala; Susan Kunnas; Eelis Halmemies; Eiko Nakayama; Petri Kilpeläinen; Ari Ora; Janne Kaseva; Jarkko Hellström; Varpu S. Marjomäki; Maarit Karonen; Kazuhiko Fukushima
• Keywords: Tannic acid; Tannin; Condensed tannin

This study demonstrated the antibacterial and antiviral potential of condensed tannins tannic acid when incorporated into fiber networks tested for functional material purposes. Condensed were extracted from industrial bark Norway spruce by using pressurized hot water extraction (PHWE), followed purification extracts XADHP7 treatment to obtain sugar-free extract. The chemical composition was analyzed HPLC, GC‒MS UHPLC after thiolytic degradation. test matrices, i.e., lignocellulosic handsheets, produced impregnated with tannin-rich extracts, used as a commercial reference. efficacy handsheets bioluminescent bacterial strains ( Staphylococcus aureus RN4220+pAT19 Escherichia coli K12+pCGLS11) Enterovirus coxsackievirus B3. Potential bonding extract within matrices studied FTIR-ATR spectroscopy. deposition characteristics (distribution accumulation patterns) tannin compounds measured visualized direct mapping time-of-flight secondary ion mass spectrometry (ToF-SIMS) digital microscopy. Our results first time, how obtained side streams green chemistry possess properties immobilized create substitutes plastic hygienic products, personal protection materials such surgical face masks, or food packaging prolong shelf life foodstuffs prevent spread infections. However, more research is needed further develop this proof-of-concept ensure stable in product prototypes specific chemistry.