ASTM F2260-18 PDF

Full title and description

Standard Test Method for Determining Degree of Deacetylation in Chitosan Salts by Proton Nuclear Magnetic Resonance (1H NMR) Spectroscopy (Designation: ASTM F2260-18). This method describes a quantitative 1H NMR procedure for determining the degree of deacetylation (DDA) of water-soluble chitosan salts (for example, chitosan chloride and chitosan glutamate) intended for biomedical and pharmaceutical/TEMP applications.

Abstract

ASTM F2260-18 specifies sample preparation (including controlled depolymerization where required), acquisition of high-resolution proton NMR spectra, and calculation of percent DDA from characteristic proton signal intensities. The procedure is designed to be rapid and suitable for routine quality-control and characterization of chitosan salts with DDA in the validated range.

General information

• Status: Published — ASTM F2260-18 (current designation; noted with an active redline entry in ASTMs records as of 2025).
• Publication date: Effective/Published: 01 June 2018 (F2260−18).
• Publisher: ASTM International (Committee F04 — Medical and Surgical Materials and Devices).
• ICS / categories: 11.100 (Laboratory medicine) — listed under related laboratory/biomaterials standards (ICS subcode commonly shown as 11.100.99).
• Edition / version: F2260-18 (standard designation indicates 2018 revision).
• Number of pages: 6 pages (concise test-method document).

Scope

This test method covers determination of degree of deacetylation in chitosan and chitosan salts intended for biomedical and pharmaceutical use, specifically validated for chitosan chloride and chitosan glutamate and for DDA values from about 50% up to and including 99%. The method is intended for high-resolution solution-state 1H NMR analysis and includes guidance on depolymerization, sample equilibration, and spectral acquisition to obtain reliable quantitative signals.

Key topics and requirements

• Quantitative 1H NMR spectroscopy as the measurement technique for determining relative proton signal intensities and calculating percent DDA.
• Sample depolymerization (e.g., controlled nitrous-acid degradation) to reduce viscosity and obtain well-resolved spectra (recommended DPn ≈ 15–30).
• Analysis conditions including elevated sample equilibration/analysis temperature (example: about 90 ± 1 °C) and controlled pH to avoid artifactual deacetylation during short analysis times.
• Validated DDA measurement range (approximately 50–99%) and explicit applicability to common chitosan salts (chloride, glutamate).
• Routine-use emphasis: method framed as simple, rapid, and suitable for QC and characterization in biomaterials/drug-delivery contexts.

Typical use and users

Primary users include biomaterials researchers, pharmaceutical and tissue-engineering product developers, analytical chemistry/NMR laboratories, and manufacturing quality-control teams that need a reliable measure of chitosan composition (DDA) to predict biological function, charge density, and performance in formulations or scaffolds. Regulatory or product development teams evaluating chitosan-based components for TEMPs or drug-delivery systems also commonly apply this test method.

Related standards

Related ASTM documents and guides include Guide F2103 (characterization and testing of chitosan salts for biomedical/TEMP use) and other F04-series methods for chitosan characterization such as standards addressing molar mass (e.g., F2602-18 for SEC‑MALS). The F2260 series replaces/updates prior F2260 versions (for example, earlier F2260-03 reapproved editions).

Keywords

chitosan; degree of deacetylation; DDA; 1H NMR; proton NMR; chitosan salts; chloride; glutamate; depolymerization; biomaterials; TEMPs; ASTM F2260-18.

FAQ

Q: What is this standard?

A: ASTM F2260-18 is a standardized test method that specifies how to determine the degree of deacetylation of chitosan salts using high-resolution proton (1H) NMR spectroscopy.

Q: What does it cover?

A: It covers sample preparation (including controlled depolymerization where necessary), spectral acquisition and signal-integration procedures, calculation of percent DDA from proton signal intensities, and recommended analysis conditions for water-soluble chitosan salts (notably chloride and glutamate) within the validated DDA range.

Q: Who typically uses it?

A: Biomaterials scientists, analytical/NMR laboratories, pharmaceutical developers, tissue-engineering product teams, and QC labs that need reproducible composition data for chitosan-based materials.

Q: Is it current or superseded?

A: The standard designation is F2260-18 (published/effective in 2018). ASTM listings indicate the F2260-18 text as the current 2018 version and include redline/administrative entries in later years (ASTM store metadata shows an active F2260-18 record with updates noted through 2025). Users should check ASTM’s catalog or the committee records for any amendments or reaffirmations after 2018 before relying on the standard for compliance decisions.

Q: Is it part of a series?

A: Yes — it is part of ASTM’s F04 committee work on medical and surgical materials and devices and is linked to other chitosan-related standards and guides such as F2103 (characterization guide) and other F04 test methods addressing chitosan molar mass and related measurements.

Q: What are the key keywords?

A: Chitosan, degree of deacetylation (DDA), 1H NMR, chitosan chloride, chitosan glutamate, depolymerization, biomaterials, TEMPs, ASTM F2260-18.