qPCR Assay for Heparin Origin Differentiation

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Solution Overview

Problem

Current methods are inadequate for conclusively determining the bovine or porcine origin of crude heparin sodium, leading to concerns about excessive bleeding and contamination risks, particularly with bovine-derived heparin.

Innovation Solution

A method involving DNA isolation from crude heparin samples using anion exchange resins, followed by quantitative polymerase chain reaction (qPCR) with species-specific primers to differentiate between porcine and bovine DNA, allowing for the identification of contaminants and ensuring the purity of heparin products.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional methods are used to determine heparin origin, then the process is simple, but the measurement precision and reliability are insufficient to conclusively differentiate between porcine and bovine heparin

Engineering Contradiction:

Improveorigin differentiation precisionVSAvoidDNA isolation and qPCR process complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The complex DNA isolation process is segmented into distinct steps: binding DNA and heparin to anion exchange resin, differentially eluting DNA with elution solution, concentrating the isolated DNA, and purifying using silica-based resin. Each step targets specific contaminants or optimizes a particular aspect of DNA recovery, enabling precise origin differentiation while managing complexity through systematic breakdown of the overall process

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Anion exchange resin serves as an intermediary medium that selectively binds both DNA and heparin, enabling their differential elution. The resin acts as a mediator that facilitates the separation process by exploiting differences in charge characteristics between DNA and heparin, allowing controlled release of DNA while retaining heparin on the column

Inventive Principle:

Principle #24Intermediary (Mediator)

2Quantity of substance

If bovine-derived heparin is used, then the supply is abundant, but harmful factors increase due to excessive bleeding risks and pathogen contamination

Engineering Contradiction:

Improveheparin supply availabilityVSAvoidbleeding risk and pathogen contamination

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The qPCR assay provides feedback about the animal origin of heparin samples by detecting species-specific DNA sequences. This feedback mechanism enables real-time identification of bovine contamination, allowing for immediate rejection of affected batches and prevention of harmful effects before they occur in therapeutic applications

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The method converts the potential harm of bovine heparin contamination into a beneficial detection opportunity by using species-specific primers that only bind to bovine DNA sequences. This allows the system to specifically identify and flag contaminated samples while maintaining the ability to process legitimate porcine heparin without interference

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Manufacturing precision

If DNA isolation is performed without purification steps, then the process is faster, but the manufacturing precision of DNA quality is insufficient for accurate PCR detection

Engineering Contradiction:

ImproveDNA purity and qualityVSAvoidDNA isolation speed

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

Purification steps are performed as preliminary actions before the critical qPCR detection phase. The silica-based resin purification removes remaining contaminants and optimizes DNA quality in advance, ensuring that the subsequent PCR amplification proceeds with maximum efficiency and accuracy without requiring rework or additional processing steps later

Inventive Principle:

Principle #10Preliminary action

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 approach enables accurate identification of the animal origin of heparin, reducing contamination risks and ensuring compliance with regulatory standards by distinguishing between porcine and non-porcine DNA with high sensitivity and specificity.

Implementation Method 1

simultaneously binding any DNA present and the heparin in the crude heparin sample to an anion exchange resin

Methodology Applied

Scientific EffectIon exchange: Ion Exchange

Implementation Method 2

further purifying the isolated DNA using a silica based resin such that the isolated DNA is at least 50 base pairs in length

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 3

performing quantitative polymerase chain reactions on one or more aliquots of the concentrated isolated DNA extracted in step (a) using the PCR reaction mixture provided in step (b)

Methodology Applied

Scientific EffectPolymerase chain reaction:

Data Source

PatentUS9758819B2PCR assay for animal origin of heparin

Publication Date: 2017.09.12 NANTPHARMA LLC

AI summary

The invention provides methods and reagents for use in distinguishing heparin sodium of porcine origin from heparin sodium of bovine origin using quantitative polymerase chain reaction.