In the study of neurotransmitter receptors in Xenopus oocytes, several chemical kinetic techniques are commonly employed:

1. Patch-Clamp Electrophysiology: This is a widely used technique to measure the ionic currents that flow through neurotransmitter receptors when they are activated. It provides detailed information on the kinetics of receptor activation, desensitization, and deactivation.

2. Two-Electrode Voltage Clamp (TEVC): This method is specifically useful in Xenopus oocytes due to their large size. It allows for the control of the membrane potential while recording the resulting ionic currents, helping to elucidate the kinetic properties of receptor activity.

3. Radioligand Binding Assays: These assays involve the use of radioactively labeled ligands to study the binding kinetics of neurotransmitters to their receptors. This technique can provide information on the affinity and number of binding sites.

4. Fluorescence-Based Assays: Techniques like Förster Resonance Energy Transfer (FRET) or fluorescence quenching can be used to investigate the conformational changes and kinetics of receptor activation.

5. Stopped-Flow Spectroscopy: Although less common, this technique can be used to study the rapid kinetics of ligand-receptor interactions by rapidly mixing reactants and monitoring changes in absorbance or fluorescence.

These techniques, individually or in combination, provide comprehensive insights into the kinetic properties and mechanisms of neurotransmitter receptors in Xenopus oocytes.