Method and apparatus for analyte sensing

A glucose sensing system comprising:

• a glucose sensor which is implanted in subcutaneous tissue of an animal body, the glucose sensor including:
• a first chamber containing (i) first magnetic particles and (ii) a hydrocolloid solution having a viscosity which is dependent on and/or a function of the concentration of glucose in the first chamber, wherein the first magnetic particles are dispersed in the hydrocolloid solution and wherein, when the first chamber is implanted in subcutaneous tissue of an animal body, glucose in the animal body may enter and exit the first chamber;
• and
• a reference chamber containing (i) second magnetic particles and (ii) a reference solution wherein the second magnetic particles are dispersed in the reference solution;
• and
• instrumentation to determine data which is representative of a change in viscosity of the hydrocolloid solution in the first chamber.

A glucose sensor for measuring the concentration of glucose in a fluid, the glucose sensing comprising:

• a first chamber;
• a first plurality of magnetic particles disposed in the first chamber;
• a first solution disposed in the first chamber, wherein the first solution includes a viscosity which is dependent on and/or a function of the concentration of glucose in the first chamber;
• and
• wherein the first plurality of magnetic particles are dispersed in the first solution and wherein, when the first chamber is in fluidic contact with the fluid, glucose in the fluid may enter and exit the first chamber.