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Merck

Photonic crystal borax competitive binding carbohydrate sensing motif.

The Analyst (2009-04-22)
Qingzhou Cui, Michelle M Ward Muscatello, Sanford A Asher
ABSTRACT

We developed a photonic crystal sensing method for diol containing species such as carbohydrates based on a poly(vinyl alcohol) (PVA) hydrogel containing an embedded crystalline colloidal array (CCA). The polymerized CCA (PCCA) diffracts visible light. We show that in the presence of borax the diffraction wavelength shifts as the concentration of glucose changes. The diffraction shifts result from the competitive binding of glucose to borate, which reduces the concentration of borate bound to the PVA diols.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Sodium tetraborate decahydrate, BioXtra, ≥99.5%
Sigma-Aldrich
Sodium tetraborate decahydrate, ACS reagent, ≥99.5%
Sigma-Aldrich
Sodium tetraborate decahydrate, ReagentPlus®, ≥99.5%
Sigma-Aldrich
Sodium tetraborate decahydrate, puriss. p.a., ACS reagent, reag. ISO, buffer substance, ≥99.5%
Sigma-Aldrich
Sodium tetraborate decahydrate, puriss., meets analytical specification of Ph. Eur., BP, NF, 99.0-103.0%