AV-105 Polymorph Selection for Stable 18F-Florbetapir Conversion

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Solution Overview

Problem

There is a need for alternative solid-state forms of florbetapir precursors with improved thermodynamic stability for the manufacturing of active pharmaceutical products, particularly to address the challenges posed by the short half-life of 18F-labeled radiopharmaceuticals like florbetapir, which require rapid conversion at PET imaging centers.

Innovation Solution

Development of two crystalline forms, Form A and Form B, of the florbetapir precursor AV-105, characterized by specific X-ray powder diffraction patterns, with Form B being identified as the more thermodynamically stable form, suitable for efficient conversion to 18F-florbetapir.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the precursor AV-105 is used for manufacturing 18F-florbetapir, then the radiopharmaceutical can be produced for PET imaging, but the short half-life of 18F requires rapid conversion and administration within about 10 hours, complicating commercial distribution

Engineering Contradiction:

Improveconversion speed to 18F-florbetapirVSAvoiddistribution complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent provides pre-characterized crystalline forms of AV-105 precursor with defined XRPD patterns and thermodynamic stability properties. By establishing the precursor structure beforehand with known stability characteristics, the manufacturing process at PET imaging centers can proceed rapidly without needing to optimize crystallization conditions during the limited 10-hour window, thus resolving the contradiction between conversion speed and distribution complexity

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent identifies and characterizes different polymorphic forms of AV-105 with distinct thermodynamic stability properties. By selecting specific crystalline forms with optimal stability parameters for the precursor, the patent enables reliable storage and handling during distribution while maintaining readiness for rapid 18F-labeling, thus resolving the time-critical nature of the process

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If alternative solid-state forms of florbetapir precursor are developed, then thermodynamic stability is improved for manufacturing, but the need to characterize and control specific crystalline forms increases process complexity

Engineering Contradiction:

Improvethermodynamic stability of precursorVSAvoidcrystalline form characterization

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent systematically characterizes different polymorphic forms of AV-105 using XRPD patterns and thermodynamic stability measurements. By establishing clear diagnostic parameters (specific diffraction peaks at defined 2-theta angles) and stability hierarchies among forms, the patent provides a framework for controlling crystalline form without requiring complex real-time monitoring, thus resolving the contradiction between stability improvement and process complexity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces complex stability control mechanisms with simple XRPD pattern matching for quality control. Instead of requiring sophisticated in-process monitoring of thermodynamic stability, the patent enables routine characterization using standard XRPD techniques with well-defined diagnostic peaks, thus resolving the contradiction between improved stability and increased complexity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Form B provides enhanced thermodynamic stability, ensuring reliable and efficient conversion of AV-105 to 18F-florbetapir, facilitating consistent PET imaging without the limitations of short half-life issues.

Implementation Method 1

characterized by an X-ray powder diffraction pattern using CuKα radiation comprising a peak at diffraction angle 2-theta of 20.9°

Methodology Applied

Scientific EffectX-ray powder diffraction: X-Ray

Implementation Method 2

X-ray powder diffraction pattern using CuKα radiation comprising a peak at diffraction angle 2-theta of 20.9° and one or more peaks selected from the group consisting of 3.8°, 15.1° and 21.2°

Methodology Applied

Scientific EffectBragg diffraction: Bragg Diffraction