Dry Phosphorescent Calibration Slides for Fluorescence Detectors
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Solution Overview
Problem
Current fluorescence-based assays face inter-site variations due to manufacturing inconsistencies, leading to inconsistent integration times and the need for time-consuming, error-prone wet calibration techniques with non-reusable slides.
Innovation Solution
A dry calibration device comprising a phosphorescent material and a neutral density filter housed in a plastic structure, which mimics fluorophore behavior and adjusts light intensity to standardize fluorescence detector calibration across sites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wet calibration techniques are used to minimize inter-site variations, then measurement precision is improved, but productivity deteriorates due to time-consuming preparation and non-reusability
Solution Approach 1:
The patent creates a dry calibration slide that copies the essential optical properties of wet fluorophore solutions without requiring actual liquid samples. The dry phosphorescent materials replicate the emission characteristics of fluorescent dyes, allowing calibration to be performed on a stable, reusable solid substrate that mimics the behavior of wet calibration standards.
Solution Approach 2:
The patent changes the physical state parameter from liquid (wet calibration) to solid (dry calibration). By converting the calibration standard from a liquid fluorophore solution to a solid phosphorescent material on a durable slide, the system eliminates the need for repeated preparation while maintaining calibration functionality. The neutral density filters also allow parameter adjustment of light intensity to simulate different fluorophore concentrations.
2Measurement precision
If wet calibration slides are prepared with varying fluorophore concentrations, then measurement precision is improved, but loss of time increases due to careful preparation requirements
Solution Approach 1:
The calibration standards are pre-prepared in dry form with known phosphorescent materials and neutral density filter combinations that correspond to specific fluorophore concentrations. This preliminary preparation eliminates the need for time-consuming liquid handling, mixing, and loading steps during actual calibration operations. The dry slides are manufactured in advance with precise material compositions and can be stored ready for use.
Solution Approach 2:
The dry phosphorescent materials on the calibration slide copy the optical emission properties of various fluorophore concentrations without requiring actual liquid preparation. Each dry slide contains phosphorescent materials and neutral density filters configured to replicate the signal characteristics of specific fluorophore concentrations, eliminating the need to physically prepare liquid standards for each calibration point.
3Measurement precision
If wet calibration slides are used to achieve accurate calibration, then measurement precision is improved, but reliability deteriorates due to low durability and non-reusability
Solution Approach 1:
The patent changes the physical state from liquid to solid, transforming the calibration slide from a disposable wet mount to a durable dry solid substrate. The solid phosphorescent materials on the dry slide are resistant to evaporation, contamination, and mechanical damage that plague liquid-based calibration standards. This state change enables the slides to be handled, stored, and reused multiple times while maintaining calibration accuracy.
Solution Approach 2:
The dry calibration slide creates a stable, reusable copy of the calibration standard function without requiring fragile liquid components. The phosphorescent materials are embedded in a solid matrix that protects them from degradation, allowing the same calibration slide to be used repeatedly across multiple calibration operations while maintaining consistent performance.
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 dry calibration method reduces inter-site variation by up to 10% and enhances reproducibility, providing a reusable and efficient calibration solution for fluorescence detectors.
Implementation Method 1
a first layer comprising a dry phosphorescent material positioned adjacent to a second layer comprising a neutral density filter
Implementation Method 2
the dry phosphorescent material used in the dry calibration device is a material characterized by the ability to reproduce a Stokes-shifted light emission associated with a selected fluorophore
Implementation Method 3
the neutral density filter comprises a material capable of simulating different fluorophore concentrations by adjusting the stops of light reduction
Data Source
AI summary
Disclosed are a dry calibration device for calibrating fluorescent detectors and methods of making and using such a device to obtain accurate calibration of single site and multiplexed fluorescent detectors. The device comprises slides that use phosphorescent material with neural density filters to replicate varying fluorophore concentrations.