Temperature-Controlled Electrospray Ionization Source for Protein Aggregation
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Solution Overview
Problem
Conventional electrospray ionization mass spectrometry (ESI MS) struggles to accurately monitor protein aggregation processes due to their transient nature and fast progression, making it difficult to capture in-process snapshots, and existing temperature-controlled systems face issues with heat loss and uncontrolled protein degradation, limiting the understanding of heat-induced structural changes in biopolymers.
Innovation Solution
A temperature-controlled electrospray ionization source with a metallic capillary, heat shield, and heating element, designed for continuous-flow sample introduction, which maintains uniform temperature and reduces heat loss, allowing for precise monitoring of heat-induced structural changes and aggregation processes in biopolymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ESI MS is used to monitor protein aggregation, then the analysis of endpoint species is achievable, but the transient intermediate states cannot be captured due to the fast progression of aggregation
Solution Approach 1:
The patent applies preliminary action by pre-heating the sample to desired temperatures before injection into the ESI source. This allows the aggregation process to be initiated and stabilized at controlled temperatures prior to analysis, enabling capture of transient intermediates at specific time points rather than only endpoint analysis. The temperature-controlled heating system prepares the sample in advance with defined thermal history.
Solution Approach 2:
The patent implements periodic action through temperature cycling protocols where samples are heated to specific temperatures for defined periods, then cooled and analyzed. This periodic heating-cooling-analyzing cycle allows multiple snapshots of aggregation intermediates to be captured at different stages, transforming the continuous fast aggregation process into discrete observable states.
2Measurement precision
If temperature-controlled heating is applied to study heat-induced protein changes, then structural transition detection is improved, but uncontrolled protein degradation occurs due to heat loss and prolonged exposure
Solution Approach 1:
The patent applies continuity of useful action through rapid continuous flow of sample through the heated zone. The sample continuously flows through the temperature-controlled capillary, minimizing residence time at elevated temperatures while maintaining precise temperature control. This continuous flow regime allows structural transitions to be detected without prolonged heat exposure that would cause degradation.
Solution Approach 2:
The patent implements parameter changes by precisely controlling temperature, flow rate, and residence time as independent variables. By optimizing the combination of temperature (e.g., 60-90°C), flow rate (e.g., 1-10 μL/min), and capillary dimensions, the system achieves sufficient thermal energy to induce structural transitions while limiting total heat exposure duration to prevent irreversible degradation.
3Duration of action of moving object
If longer capillary length is used for sample transport, then heating time is increased allowing better structural characterization, but heat loss increases and temperature control becomes difficult
Solution Approach 1:
The patent applies this principle by using a thin-walled capillary with controlled dimensions (e.g., 75 μm outer diameter, 50 μm inner diameter). The thin wall provides sufficient mechanical strength while minimizing thermal mass and heat loss to surroundings. This allows efficient heat transfer to the sample while maintaining temperature control, resolving the contradiction between heating duration and heat loss.
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
Enables accurate detection of reversible and irreversible heat-induced denaturation and aggregation processes in biopolymers, providing detailed insights into protein behavior under heat stress, improving the understanding of protein stability and aggregation mechanisms.
Implementation Method 1
a heating element in thermal contact with the metallic capillary and the metallic heat shield
Implementation Method 2
a metallic heat shield in thermal contact with the spray emitter, wherein the metallic heat shield surrounds the spray emitter and extends along the spray emitter length
Implementation Method 3
a metallic capillary for transport of a sample, the metallic capillary connected to a sample injector at a first end and connected to a spray emitter at a second end, wherein the metallic capillary has a capillary length for the transport of the sample from the first end to the second end of the metallic capillary, and wherein the inner diameter of the spray emitter is substantially the same at both ends of the spray emitter
Data Source
AI summary
Disclosed herein is an electrospray ionization source that provides improved temperature control compared to prior sources. A combination of a continuous flow sample design and the use of a long heat shield combine to improve thermal control and reduce memory effects observed with prior designs. The temperature-controlled source is particularly useful for the study of biomolecules, particularly the study of protein aggregation.