(Monheim, Germany; now BASF). Phosphate buffers (pH 3–9, ionic
strengths 50–100 mM) were prepared in deionised water (MilliQ
system, Millipore, USA) from reagents obtained from Sigma Aldrich
(St. Louis, MO, USA). Poly(vinyl alcohol) (PVA) was purchased from
Merck (Whitehouse Station, NJ, USA).
(Monheim, Germany; now BASF). Phosphate buffers (pH 3–9, ionicstrengths 50–100 mM) were prepared in deionised water (MilliQsystem, Millipore, USA) from reagents obtained from Sigma Aldrich(St. Louis, MO, USA). Poly(vinyl alcohol) (PVA) was purchased fromMerck (Whitehouse Station, NJ, USA).
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