Lyophilized Nucleic Acid Kit for Stable Shipping

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Solution Overview

Problem

Current nucleic acid sequencing methods require significant quantities of dry ice for shipping, which is not only costly and complex but also sensitive to temperature fluctuations, leading to inconsistent and reproducible results due to the instability of enzymes used in next-generation sequencing platforms.

Innovation Solution

Development of lyophilized reaction mixtures that become inactive at room temperature, allowing for stable storage and shipping without coolants, reducing pipetting steps, and eliminating the need for freezer validation, thereby ensuring consistent reagent dosing and performance across multiple samples.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If liquid-based enzyme reagents are used for sequencing sample preparation, then enzyme activity is maintained during storage, but the reagents require dry ice for shipping and are sensitive to temperature fluctuations

Engineering Contradiction:

Improveenzyme activity stabilityVSAvoidshipping complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by transitioning enzymes from liquid to lyophilized (freeze-dried) state, which fundamentally alters their physical and chemical properties. This transformation enables enzymes to remain stable at room temperature without requiring dry ice shipping, while maintaining catalytic activity upon rehydration. The lyophilization process removes water from the enzyme preparation, creating a stable powder form that can be stored and shipped under ambient conditions.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements segmentation by dividing the enzyme preparation into separate components: the lyophilized enzyme powder and the rehydration buffer. This separation allows the enzyme to be stabilized in dry form for shipping, while the buffer remains in liquid form to provide necessary chemical conditions. The two components are combined only at the point of use, eliminating the need for continuous cold chain maintenance.

Inventive Principle:

Principle #1Segmentation

2Productivity

If multiple rounds of freeze-thawing are performed on stock liquid solutions, then samples can be prepared in batches, but non-homogenous thawing occurs leading to variation in sample preparation efficiency

Engineering Contradiction:

Improvebatch processing capabilityVSAvoidsample preparation consistency

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent employs disposable single-use lyophilized reaction mixtures that are prepared in advance and stored stably at room temperature. Each reaction tube contains pre-measured, lyophilized reagents that are activated by adding sample and buffer. This eliminates the need to repeatedly freeze and thaw stock solutions, as each reaction uses a fresh, stable, single-use preparation. The disposable nature ensures consistency across batches without the variability introduced by multiple freeze-thaw cycles.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Adaptability or versatility

If liquid-based reagents are used, then reagent flexibility is maintained, but the number of pipetting steps increases and cross-contamination risk rises

Engineering Contradiction:

Improvereagent flexibilityVSAvoidsample preparation simplicity

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The patent merges multiple separate reagent components into a single integrated lyophilized reaction mixture. Instead of handling separate enzyme solutions, buffers, and additives, all necessary reagents are combined in a single freeze-dried formulation that rehydrates to create the complete reaction system. This consolidation reduces the number of pipetting steps from multiple separate additions to a single reconstitution step, thereby minimizing cross-contamination risk while maintaining reagent flexibility.

Inventive Principle:

Principle #5Merging (Combining)

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 lyophilized kits enable simplified shipping, reduced contamination risks, faster sample preparation, and consistent results by maintaining enzyme stability and eliminating the need for thawing, resulting in improved reproducibility and efficiency in nucleic acid sequencing.

Implementation Method 1

The process of lyophilization yields a product that is inactive at room temperature until rehydrated with water. As a result of lyophilization the enzymes become essentially immobilized and thus are stable to conditions that would previously have caused significant decrease in enzyme activity.

Methodology Applied

Scientific EffectLyophilization: Freeze Drying