MilliporeSigma
  • In situ-ATR-FTIR analysis on the uptake and release of streptomycin from polyelectrolyte complex layers.

In situ-ATR-FTIR analysis on the uptake and release of streptomycin from polyelectrolyte complex layers.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy (2013-01-29)
B Torger, M Müller
ABSTRACT

In-situ ATR-FTIR spectroscopy and line shape analysis of the diagnostic spectral region was used to quantify the bound amount and release of the antibiotic streptomycin (STRP) at polyelectrolyte (PEL) multilayers (PEM) of poly(ethyleneimine) (PEI) and poly(acrylic acid) (PAA) or PEI and sodium alginate (ALG). Unlike common concepts based on the drug enrichment of the release medium, this analytical concept allowed to measure quantitatively the drug depletion in the delivery matrix. The measured kinetic in situ ATR-FTIR data were analysed by a modified Korsmeyer-Peppas equation based on two characteristic release parameters k and n. As main experimental parameters the number of PEL layers (adsorption steps) z and the STRP/PEL ratio were varied. For z=8 the STRP/PEL ratio showed the most significant influence on release kinetics, whereby for STRP/PEL=1:25 slowest (n=0.77) and lowest (k=21.4%) and for STRP/PEL=1:5 most rapid (n=0.30) and highest (k=58.6%) drug releases were found. PEM-PEI/ALG-8 (STRP/PEL=1:5) revealed slower release rates (n=0.58) and lower released STRP amounts (k=17.1%) compared to PEI/PAA. UV-VIS data on time dependent STRP enrichment of the release medium showed a similar trend compared to respective ATR-FTIR data on STRP depletion in PEM. Released amounts of around 1-2mg from the herein introduced PEM films could be determined. The introduced analytical concept will be used as screening tool for other drugs, drug eluting films and bone substituting materials.

MATERIALS
Product Number
Brand
Product Description

Supelco
Streptomycin sesquisulfate hydrate, VETRANAL®, analytical standard
Supelco
Streptomycin solution, ~1 mg/mL in 1 mM EDTA, analytical standard
Sigma-Aldrich
Poly(acrylic acid) solution, average Mw ~2,000, 50 wt. % in H2O, electronic grade
Sigma-Aldrich
Streptomycin sulfate salt, powder, BioReagent, suitable for cell culture
Sigma-Aldrich
Streptomycin sulfate salt, powder
Sigma-Aldrich
Streptomycin sulfate salt, powder, BioXtra, suitable for mouse embryo cell culture
Sigma-Aldrich
Poly(acrylic acid) solution, average Mw ~100,000, 35 wt. % in H2O
Sigma-Aldrich
Poly(acrylic acid, sodium salt) solution, average Mw ~8,000, 45 wt. % in H2O
Sigma-Aldrich
Poly(acrylic acid) solution, average Mw ~250,000, 35 wt. % in H2O
Sigma-Aldrich
Poly(acrylic acid, sodium salt) solution, average Mw ~1,200, 45 wt. % in H2O
Sigma-Aldrich
Poly(acrylic acid), average Mv ~3,000,000
Sigma-Aldrich
Poly(acrylic acid sodium salt), average Mw ~5,100 by GPC, powder
Sigma-Aldrich
Poly(acrylic acid), average Mv ~1,250,000
Sigma-Aldrich
Poly(acrylic acid), average Mv ~450,000
Sigma-Aldrich
Streptomycin Ready Made Solution, 100 mg/mL in water
Supelco
Poly(acrylic acid sodium salt), analytical standard, for GPC, 16,000
Sigma-Aldrich
Poly(acrylic acid), average Mv ~4,000,000
Sigma-Aldrich
Poly(acrylic acid sodium salt), average Mw ~2,100
Sigma-Aldrich
Poly(acrylic acid)
Supelco
Poly(acrylic acid), analytical standard, average Mn 130,000 (Typical)