Ester-Based Reagent for Histological Sample Dehydration and Diaphanization
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Solution Overview
Problem
Current methods for processing histological and cytological samples are hindered by the use of harmful, toxic, and volatile solvents, requiring lengthy processing times and multiple stages, which pose risks to operators and the environment.
Innovation Solution
A composition comprising 2-ethylhexyl esters, such as 2-ethylhexyl benzoate, is used as a single reagent for both dehydration and diaphanization, reducing processing time and stations, and is non-toxic and low in volatility, adhering to safety directives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods using multiple solvents (alcohol, xylene, paraffin) are used for sample processing, then dehydration and diaphanization can be achieved, but the processing time is lengthy (12-18 hours) and multiple stations are required
Solution Approach 1:
The patent combines dehydration and diaphanization functions into a single reagent (2-ethylhexyl esters) that performs both functions simultaneously, eliminating the need for separate alcohol and xylene treatment stations. This merging of functions reduces the number of processing stations from 12-15 to just 3 stations and cuts processing time from 12-18 hours to 9 hours.
Solution Approach 2:
The 2-ethylhexyl ester reagent serves multiple functions: it acts as both a dehydration agent (removing water from tissues) and a diaphanization agent (clearing tissues for paraffin embedding). This multi-functional reagent replaces the conventional sequence of alcohol-based dehydration and xylene-based diaphanization, simplifying the processing protocol while maintaining effectiveness.
2Object-affected harmful factors
If conventional solvents (xylene, toluol, octane, acetone, isoparaffins) are used for diaphanization, then tissue clearing is achieved, but the solvents are harmful, toxic, and volatile posing risks to operators and environment
Solution Approach 1:
The patent replaces harmful conventional solvents (xylene, toluol, octane, acetone, isoparaffins) with 2-ethylhexyl esters that have favorable safety profiles. The new reagent has low volatility (reducing inhalation risks), is non-toxic, and environmentally sustainable while maintaining full diaphanization effectiveness. This substitution converts a harmful processing step into a safe one without sacrificing processing efficiency.
3Manufacturing precision
If increasing gradations of alcohol (50%, 70%, 80%, 90%, 96%, 99.99%) are used for dehydration, then complete water removal is achieved, but the process requires multiple steps and extensive time
Solution Approach 1:
The patent extracts the dehydration function from the multi-step alcohol gradation process and consolidates it into a single reagent system. The 2-ethylhexyl ester directly dehydrates tissues without requiring progressive concentration steps, removing the time-consuming sequence of alcohol treatments while achieving complete water removal necessary for subsequent diaphanization and embedding.
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 composition significantly reduces processing time to about 9 hours, enhances tissue preservation and diagnostic clarity, and ensures operator safety and environmental sustainability.
Implementation Method 1
The dehydration stage consists of removing water (formalin is an aqueous solution of formaldehyde) from the biological sample
Implementation Method 2
The diaphanization stage allows the biological sample to be embedded in paraffin hereafter. For this purpose solvents compatible with the impregnating agent (for example paraffin), which substitute the water soluble solvent in this stage, are used.
Implementation Method 3
the sample is subjected to the stage of embedding in paraffin consisting in immersing the sample in paraffin melted at about 54-58° C. In this stage, the diaphanizing solvent contained in tissues is replaced by paraffin. After having included samples in a tile, sample cooling and solidification
Data Source
AI summary
The present disclosure describes a composition for preparing histological, postmortem, cytological or similar samples for the analysis thereof, wherein the composition is not harmful, non-toxic, and able to rapidly produce dehydration and diaphonization of the biological samples.