Penetration and loading of human serum albumin in porous silicon layers with different pore sizes and thicknesses

• Published in: Journal of colloid and interface science Vol. 266; no. 1; pp. 40 - 47
• Main Authors: Karlsson, L.M, Tengvall, P, Lundström, I, Arwin, H
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 01.10.2003; Elsevier
• Subjects: Adsorption; Chemistry; Ellipsometry; Exact sciences and technology; General and physical chemistry; Human serum albumin; Humans; Porosity; Porous silicon; Protein adsorption; Protein loading; Protein penetration; Serum Albumin - chemistry; Silicon - chemistry; Solid-liquid interface; Surface physical chemistry; TECHNOLOGY; TEKNIKVETENSKAP; Human serum albumin; Protein penetration; Protein loading; Porous silicon; Protein adsorption; Ellipsometry; Liquid solid interface; Human serum albumin: Porous silicon; Radiolabelling; Liquid solid adsorption; Serum albumin; Layer thickness; Porous material; Protein; Pore size; Concentration effect; Silicon
• ISSN: 0021-9797; 1095-7103; 1095-7103
• DOI: 10.1016/S0021-9797(03)00595-2

Human serum albumin was adsorbed into porous silicon layers with thickness up to 3 μm and with different mean pore radius in the range 4.5–10 nm. The adsorbed amount of protein was quantified by I 125 radioactive labeling techniques and ellipsometry. The results show that albumin penetrated into the pores when the mean pore radius was larger than 5.5 nm, but could not totally occupy the available surface area when the layer thickness was larger than 1 μm. Loading of albumin both into porous layers and onto plane silicon as a function of albumin concentration was also investigated. These measurements show that loading of protein increased with protein concentration at least up to 10 mg/ml for porous silicon and up to 1 mg/ml for plane silicon. The maximum deposition into the type of porous layers used here was 28 μg/cm 2, compared to 0.36 μg/cm 2 for plane silicon.