Surfactant Blocking of Polymer Dye Non-Specific Binding
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Solution Overview
Problem
Polymer dye conjugates exhibit non-specific binding to cells in biological samples, such as monocytes and granulocytes, leading to false positive interpretations in flow cytometry assays due to their complex structure.
Innovation Solution
The use of zwitterionic or anionic surfactants, such as lauryl betaine or N-lauroyl sarcosine, is introduced to reduce or eliminate non-specific binding of polymer dye conjugates to cells in biological samples by contacting the dye conjugates with these surfactants before, during, or after sample interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If polymer dye conjugates are used for flow cytometry assays, then brightness and detection sensitivity are improved, but non-specific binding to cells increases leading to false positive results
Solution Approach 1:
The patent introduces a blocking agent as an intermediary substance that mediates between the polymer dye conjugate and the cell surface. The blocking agent binds to the cell surface first, preventing direct non-specific interaction with the dye conjugate, while allowing specific antibody-antigen binding to proceed. This resolves the contradiction by adding a mediating layer that eliminates harmful non-specific binding without affecting detection sensitivity.
Solution Approach 2:
The patent modifies the chemical parameters of the assay system by introducing substances with specific chemical properties (blocking agents with particular functional groups, surfactants with specific hydrophilic-lipophilic balance) to alter the interaction dynamics. By changing parameters such as surface charge, hydrophobicity, and molecular conformation through additive selection, the patent reduces non-specific binding while preserving the high brightness characteristics of polymer dye conjugates.
2Illumination intensity
If polymer dye conjugates are used, then signal intensity is improved, but false positive inferences occur due to non-specific binding to monocytes and granulocytes
Solution Approach 1:
The patent applies blocking agents and surfactants in preliminary steps before the actual flow cytometry measurement. By pre-treating the cells or the dye conjugate with blocking substances, the non-specific binding sites are occupied in advance, preventing false positive signals during the assay. This preliminary action preserves the high signal intensity of polymer dye conjugates while ensuring reliability by eliminating sources of false positives.
Solution Approach 2:
The patent converts the harmful non-specific binding property of polymer dye conjugates into a beneficial effect by using the same complex structure that causes non-specific binding to also enable strong specific binding. By carefully selecting blocking agents that target only non-specific interaction sites, the patent allows the inherent high affinity of polymer dye conjugates to be fully utilized for specific antibody-antigen binding, transforming the potential harm into enhanced detection capability with improved reliability.
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
The application of surfactants significantly decreases non-specific binding of polymer dye conjugates to white blood cells in blood samples, enhancing the accuracy of flow cytometry analysis by reducing false positive signals and maintaining the functional integrity of the conjugates.
Implementation Method 1
The instant disclosure provides a solution to these and other problems associated with use of polymer dye conjugates. In some embodiments, the disclosure provides a composition for reducing or eliminating non-specific binding of a dye conjugate to cells in a biological sample, the composition comprising a dye conjugate and a surfactant as described herein.
Data Source
AI summary
The disclosure relates to methods and compositions for reducing or eliminating non-specific binding of at least one dye conjugate to cells in a biological sample. A dye conjugate is contacted with at least one zwitterionic or anionic surfactant before, during or after the dye conjugate is contacted with a blood sample, resulting in substantially reduced non-specific binding of the dye conjugate to cells in the biological sample.