Patch Clamp Seal Enhancer Using Anion-Metal Ion Precipitation
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Solution Overview
Problem
The patch clamp method faces challenges in forming a strong seal between the cell membrane and the substrate due to the precipitation of salts, especially when Ca2+ is required in both internal and external solutions, and the use of fluoride is not feasible, leading to inaccuracies in ion channel function and drug target responses.
Innovation Solution
A patch clamp system using an internal solution with anions like phosphate (PO43−), sulfate (SO42−), and fluoride (F−) ions, and an external solution with metal ions such as Ca2+, Sr2+, or Ba2+, at concentrations between 1 and 20 mmol/L, to enhance seal formation without premature precipitation, allowing for effective ion channel measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluoride ions are used in the internal solution to enhance seal formation, then seal resistance is improved, but the system becomes incompatible with applications requiring Ca2+ in both internal and external solutions
Solution Approach 1:
The patent changes the chemical parameters of the internal solution by replacing fluoride ions with alternative anions (phosphate, sulfate, or chloride) and adjusting metal ion concentrations to 1-20 mmol/L, enabling seal formation without compromising compatibility with Ca2+-activated channels
Solution Approach 2:
The patent uses alternative anion-metal ion combinations (phosphate-calcium, sulfate-calcium, or chloride-calcium) that replicate the seal-enhancing function of fluoride-calcium precipitation without the harmful side effects, effectively copying the beneficial mechanism while avoiding the limitations
2Reliability
If high concentrations of metal ions (50-100 mM) are used in the external solution to enhance sealing, then seal formation is improved, but ion channel function is adversely affected leading to inaccurate measurements
Solution Approach 1:
The patent changes the concentration parameter of metal ions in the external solution from the conventional 50-100 mM range down to 1-20 mmol/L, which maintains sufficient seal formation capability while eliminating the adverse effects on ion channel function and measurement accuracy
3Adaptability or versatility
If Ca2+ is present in both internal and external solutions for studying Ca2+-activated channels, then application versatility is improved, but seal formation becomes difficult without fluoride
Solution Approach 1:
The patent introduces alternative anions (phosphate, sulfate, or chloride) as intermediaries that mediate seal formation through precipitation reactions with metal ions, replacing the traditional fluoride intermediary while maintaining seal formation capability in Ca2+-containing solutions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables reliable and accurate gigaseal formation, maintaining ion channel function and drug response accuracy by controlling metal ion concentrations and preventing premature salt precipitation, thus providing a valid basis for studying electrophysiological phenomena.
Implementation Method 1
it is known that small gaps between the cell and the substrate can be closed (sealed) by precipitation of a salt
Data Source
AI summary
A seal enhancer for improving the patch clamp seal in a patch clamp method or apparatus is provided. The internal solution comprises particular anions and the external solution comprises one or more metal ions at low concentration.