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3D Printed Amino Acid Glass Can Dissolve in the Body

March 18, 2023

Researchers from the Chinese Academy of Sciences in Beijing have devised a means of 3D printing glass made from amino acids that can dissolve within the human body. This revolutionary material promises significant applications in the healthcare sector and beyond.

Amino Acid Glass

Traditional glass is a versatile material with numerous applications; however, it possesses certain drawbacks, such as brittleness and incompatibility with the human body.

To overcome these limitations, researchers have developed a unique glass material derived from amino acids, the building blocks of proteins, and peptides.

The fabrication process
The fabrication process. (Image credit: Chinese Academy of Sciences)

The method of making the glasses involved the heating of the chemically modified amino acids and peptides in an inert gas atmosphere until they reached their decomposition temperature. The resulting supercooled liquid was then quenched to produce the glass while preventing crystallization.

The team used this glass in casting methods and 3D printing to achieve the final shape of the parts, making use of a commercial biological 3D printer with a temperature-controlled barrel.

The novel glass combines the best qualities of both glass and amino acids, resulting in a material that is strong, flexible, and biocompatible, meaning it can be used for a range of medical devices.

Applications

Amino acid glass can be used for multiple scenarios such as the development of new drug delivery systems, which can release medication gradually over time. This approach can enhance the effectiveness of treatments and reduce side effects.

Additionally, new bioresorbable implants made from amino acid glass can provide temporary structural support to the body while healing, eventually dissolving to eliminate the need for additional surgeries to remove the implant.

Amino acid glass can also be made to fluoresce
Amino acid glass can also be made to fluoresce, which may have applications in medical imaging. (Image credit: Chinese Academy of Sciences)

In the domain of tissue engineering, amino acid glass scaffolds can support the growth of cells, enabling the creation of functional tissue for regenerative medicine applications.

Another example given in the research is for wound healing. The biocompatible and dissolvable nature of amino acid glass makes it an ideal candidate for developing advanced wound dressings that promote healing and minimize the risk of infection.

Challenges and Future Research

The researchers have tested the degradation of different types of amino acid glass in simulated bodily fluids (specifically proteinase K solution, simulated gastric fluid (SGF[sp]), and simulated intestinal fluid (SIF[sp]), and soil, finding that one type dissolved in a week while another took several months. The reason for testing in soil is to ensure that the glass can be disposed of in compost, ensuring that the materials can be disposed of sustainably outside of the body.

mice
Researchers: always with the mice… (Image credit: Chinese Academy of Sciences)

In a further experiment with mice, the fastest-degrading glass bead was completely absorbed in 12 days, causing temporary muscle degradation, although it was shown to heal after some time.

While the development of amino acid glass is a significant breakthrough, further research is needed to optimize its properties and identify the most effective applications.

Challenges include enhancing the material’s mechanical strength, fine-tuning its dissolution rate, and exploring its compatibility with various cell types. Additionally, long-term studies are required to ensure the material’s safety and efficacy in real-world medical applications.

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About the author | Phillip Keane
Phillip is an aerospace engineer from UK. He is a graduate of Coventry University (UK), International Space University (France) and Nanyang Technological University (Singapore), where he studied Advanced Manufacturing at the Singapore Centre for 3D Printing.
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