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In pH 4.0 succinic acid–sodium hydroxide buffer solution, laccase catalyzed the oxidization of guaiacol substrate to form red particles, which exhibited a strong resonance scattering (RS) peak at 590 nm. Under the chosen conditions, as the laccase increased, the RS intensity (ΔI) increased linearly. The ΔI was proportional to laccase activity in the range of 0.10–1.2 U/mL, with a regression equation...
In the pH 6.6 Na2HPO4–NaH2PO4 buffer solutions and in the presence of urease catalyst, urea can be decomposed to form NH4+. The NH4+ reacted with sodium tetraphenyl boron (NaTPB) to form the association particles that exhibited a resonance scattering (RS) peak at 474 nm. When the urea concentration increased, NH4+ increased, and RS intensity at 474 nm enhanced linearly. Under the chosen conditions,...
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