XanTec 3D surface

XanTec 3D hydrogel sensor chips

In the table below the 3D hydrogel sensor chips available at XanTec (1) are shown. Several surface thicknesses are offered and in addition three surface densities are available: Low, Medium and Dense. 3D immobilization matrices allow multilayer ligand immobilization which leads to significant signal amplification. They are employed for qualitative screening, concentration determinations and detection and kinetic analysis of low molecular weight compounds. As a rule of thumb, the smaller the analyte is, the thicker and denser the hydrogel structure should be.

Two new surfaces for click chemistry (azide (AZD) and DBCO (DCD)) are available which have advantages over e.g. streptavidin or Ni-NTA surfaces. Further information can be found at (Xantec).

The new zwitterionic surface (ZC and ZCC) has been developed for particularly acidic or sensitive proteins that need to be covalently immobilized. In order to achieve a pre-concentration of strongly acidic, negatively charged ligands in the hydrogel, the charges were simply reversed during immobilization. Here the actually neutral, zwitterionic surface is temporarily positively charged during the activation of the carboxyl groups with NHS/EDC, so that negatively charged ligands can enter into electrostatic interaction with the surface.

XanTec flat
XanTec flat surface
Table: 3D hydrogel surfaces
Name Surface coating Functionalities Thickness (nm) Densities *
AG Agarose hydrogel hydroxy approx. 200 -
AL Alginate hydrogel carboxyl approx. 100
AZD CM dextraan azide 50, 200 L, M
AZHC Polycarboxylate azide 30, 1500 M
BHC Polycarboxylate biotin 30, 200, 1000, 1500 M
C Polycarboxylate, high charge density carboxyl 30, 80, 200 M, D
CMC Cellulose carboxymethyl approx. 200 -
CMD CM dextran carboxymethyl 50, 200, 500, 700 L, M, D
CMPEG Polyethyleneglycol, 6kDa carboxymethyl approx. 100 -
CS Polycarboxylate, partially sulfonated carboxyl 30, 80, 150 M, D
D Dextran hydroxyl 50, 200, 500 L, M, D
DCD CM dextraan DBCO 50, 200 L, M
GEL Gelatine - approx 200. -
HC Polycarboxylate, medium charge density carboxyl 30, 200, 1000, 1500 M
HLC Polycarboxylate, low charge density carboxyl 30, 200, 1000, 1500 M
HY Hyaluronic acid carboxyl approx. 100 -
HZHC Polycarboxylate hydrazide modified 30, 200, 1000 M
HEP Heparin carboxyl approx. 50 -
LD CM dextraan partially alkyl derivatised approx. 200 -
NIHC Polycarboxylate NTA polyvalent 30, 200, 1000 M
NID CM dextran NTA 50, 200, 500, 700 L, M, D
PAGHC Polycarboxylate protein A/G 30, 200,1000, 1500 M
PAGD CM dextran brush conformation protein A/G 50, 200, 500, 700 L, M
PC Pectin hydrogel carboxyl approx 200 -
PEG Polyethyleneglycol, 6 kDa hydroxyl approx 100 -
PLY Poly-L-lysine primary amine approx. 300 -
SAHC Polycarboxylate streptavidn 30, 200, 1000, 1500 M
SAD CM dextran streptavidin 50, 200, 500, 700 L, M, D
THC Polycarboxylate disulfide modified 30, 200, 1000, 1500 M
TD CM dextran disulfide modified 50, 200, 500, 700 L, M, D
UVD CM Dextran UV crosslinker 50, 200, 500, 700 -
ZC Polycarboxylate Zwitterionic, neutral. cationic after NHS activation 30, 80 M
ZCC Polycarboxylate Cationic, zwitterionic for preconcentration scouting 30, 80 M

*Densities L: low; M: medium; D: dense / Not all combinations are available.


(1)  XanTec- XanTec website. (2019). Goto reference