Biomedical Engineering Reference
In-Depth Information
2008b), considering proteins (Pr), polysaccharides (PS), and hydrocarbon-like compounds
(HC) which represent mainly lipids in biological systems. The novelty here is to take silane
(Sl) into account in addition to the three classes of biochemical compounds; the chemical
composition and density considered for these model compounds are listed in Table 3.
Accordingly, the proportion of carbon atoms due to each model compound X ( C X /C tot ) can
be computed by solving the following system of equations:
(N tot - Si org )/C tot = 0.273 × (C Pr /C tot )
(4)
O org / C tot = 0.312 × (C Pr / C tot ) + 0.833 × (C PS / C tot )
(5)
Si org / C tot = 0.333 × (C Sl / C tot )
(6)
1 = (C Pr / C tot ) + (C PS / C tot ) + (C Sl / C tot ) + (C HC / C tot )
(7)
0.15
a
0.10
0.05
0.00
0.00
0.05
0.10
0.15
N tot / Σ org
0.15
0.15
b
c
0.10
0.10
0.05
0.05
0.00
0.00
0.00
0.05
0.10
0.15
0.00
0.05
0.10
0.15
N 400 / Σ org
(N tot -Si org ) / Σ org
Fig. 9. Relations between molar concentrations ratioed to the sum of organic elements (Σorg)
measured by XPS at θ = 0° (data from Table 2) on native (open symbols) or silanized
stainless steel (closed symbols), as such ( ¡ , ) or further treated with coupling agent BS
( S , U ), glucose oxidase ( z , { ) or coupling agent followed by glucose oxidase ( , ).The
dashed lines represent a y/x ratio of 1:1.
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