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Table 2 Elemental surface composition after contact of SiO2/Si substrates with aqueous laccase mixture suspension

From: Investigations of biofilms formed on silica in contact with aqueous formulations containing laccase and maltodextrin

Time in contact [Si] (at %) [O] (at %) [C] (at %) [N] (at %) [Na] (at %) [N]/[C]
0 59.5 35.3 7.6 0.1 0 0.01
10 s 56.7 32 10.7 0.6 <0.1 0.06
1 min 55.9 31.3 12.1 0.7 <0.1 0.06
10 min 51.8 31.6 15.4 1.1 <0.1 0.07
1 h 43.4 29.1 23.6 3 0.8 0.13
4 h 38.8 28 28.4 3.8 1 0.14
Purified laccase powder 22.4 65.0 11.3 0.3 0.20
Laccase-maltodextrin powder mixture 27.3 66.5 5.4 0.3 0.08
  1. XPS results, given in atom % (at %), for times varying between 10 s and 4 h, and for laccase-containing powders