Isopropyl alcohol was purchased from Honeywell (Hanover, Germany). Petroleum solvent, Nefras grade C2-80/120, was purchased from “Latvijas ķīmija” (Riga, Latvia). Activated charcoal powder, chloroform-d, Kraft lignin, and beechwood xylan were purchased from Merck KGaA (Darmstadt, Germany). Nanofibrillated cellulose (NFC) was produced from old filter paper waste according to the method previously reported by the authors [27 (link)]. NFC sizes ranged from 40 to 120 nm in diameter, and fiber lengths from around 500 to 2000 nm. Pine needles (Pinus sylvestris, L.) were gathered locally in Latvia through a forestry company.
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