Sodium hypochlorite

Kraft
lignin (K-LN) was purchased from Sigma-Aldrich. It contains 5% moisture
and loses 3.3 wt % at temperatures >149 °C. Sodium hypochlorite
(9–11%) was purchased from Daejung Chemical Co. (Korea), poly(propylene
glycol) (PPG) and (diol type) 700 were purchased from Wako Pure Chemical
(Japan), and tin(II) 2-ethylhexanoate and toluene diisocyanate (2,4-, ca. 80%; 2,6-, ca. 20%) were purchased
from Tokyo Chemical Industry Co. (Japan). Excess diisocyanate, beyond
the quantity required to react with the OH– groups of the PPG,
was reacted with distilled water to form CO₂, which acts
as a blowing agent.^{12 (link)} A dialysis membrane
(Cellu-Sep; MFPI Company) was used to exclude molecular weights <3500
g·mol^–1.

Anisaldehyde, 3,5-dichloroaniline, and monohydrated hydrazine were purchased from Merck (Darmstadt, Germany), phenol, ascorbic acid, urease (from jack bean), DPPH (2,2-diphenyl-1-picrylhydrazyl), acetylthiocholine iodide (ATCI), acetylcholinesterase, and 5,5-ditiobis(2-nitrobenzoic) acid (DTNB) were from Sigma-Aldrich (Steinheim, Germany). Sodium hypochlorite, and sodium salicylate were from Daejung (Siheung City, Korea). Lithium chloride, sodium nitrite and sodium nitroprusside were from Riedel de Haën (Seelze, Germany). Urea, ethylenediaminetetraacetic acid and thiourea were from BDH Labs (Cambridge, England).