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Related Concept Videos

IR and UV–Vis Spectroscopy of Carboxylic Acids01:28

IR and UV–Vis Spectroscopy of Carboxylic Acids

In IR spectroscopy of carboxylic acids, the C=O bond shows a characteristic band between 1710 and 1760 cm⁻¹, and the O–H bond exhibits a broad band between 2500 and 3300 cm⁻¹.
However, the stretching absorptions for the C=O bond vary depending on the structure of carboxylic acids. The C=O bond of the free carboxylic acids shows a higher stretching frequency, 1760 cm−1, while H-bonded carboxylic acids (dimers) exhibit stretching absorptions at a lower frequency, 1710 cm−1. The C=O bond of the...

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Routine Direct Quantification of Methacrylic Groups per Gelatin Unit in Gelatin Methacryloyl Using Ultraviolet

Nazar Rad1, Zuzanna Stasiak1, Marta Klak1,2

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A new UV assay accurately quantifies methacrylic groups in GelMA, a key biomaterial for 3D bioprinting. This method improves GelMA characterization and standardization across labs.

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Area of Science:

  • Biomaterials Science
  • Biotechnology
  • Chemical Engineering

Background:

  • Gelatin methacryloyl (GelMA) is crucial for 3D bioprinting, with its properties depending on methacrylic group content.
  • Accurate quantification of methacrylic groups is vital for consistent GelMA quality.

Purpose of the Study:

  • To develop a direct UV assay for routine quantification of methacrylic groups in GelMA.
  • To establish a standardized metric for methacrylic content independent of gelatin source and lysine content.

Main Methods:

  • A direct UV assay was developed and validated against NMR techniques.
  • A separate UV-based method was created to quantify methacrylic acid contamination.
  • Methacrylic content was redefined as groups per 100 kDa gelatin.

Main Results:

  • The UV assay demonstrates accuracy and precision comparable to NMR.
  • The method is independent of sample concentration and applicable to various gelatin sources.
  • A new metric for methacrylic content was defined, improving standardization.

Conclusions:

  • The developed UV assay offers a reliable, routine-ready method for GelMA characterization.
  • This approach standardizes GelMA reporting, enhancing reproducibility in bioprinting applications.