From soil to syringe: the untapped medical promise of biochar

A recent review article authored by researchers at the Eye Institute, Eye and ENT Hospital, Shanghai Medical College, Fudan University provides a comprehensive analysis of the emerging role of biochar in medicine. Biochar, a stable and porous carbon-rich material produced from biomass, is widely recognized for its benefits in agriculture and environmental remediation. This study shifts the focus to its less-explored, yet highly promising, applications directly related to human health.

A New Perspective on an Environmental Material

While biochar has been extensively studied for soil enhancement and carbon sequestration, its medical potential has remained largely unexamined. In their work, authors Qiao Zhuo, Yu Liang, Yuxiang Hu, Mingsu Shi, Chen Zhao, and Shujie Zhang systematically evaluated recent scientific literature to map out the current landscape. Their analysis identified five principal areas where biochar is making inroads: contaminant immobilization, medical waste treatment, biosensing technologies, drug delivery, and its own potential toxicity.

Tackling Contaminants and Medical Waste

The review details biochar's exceptional ability to immobilize harmful contaminants. Its vast surface area and active sites make it effective at adsorbing heavy metals and residual antibiotics from water and soil, preventing them from entering the food chain and affecting human health. Furthermore, the paper discusses the use of pyrolysis, the process that creates biochar, as an efficient method for treating the massive increase in medical waste. This thermal process can safely convert plastic-heavy hospital waste into valuable byproducts like bio-oil and biogas.

A Balanced View on Biochar's Safety

The authors present a balanced perspective by also examining the potential negative health effects of biochar. Because of its low density, biochar can produce fine dust particles that may be inhaled, and it can release previously adsorbed pollutants back into the environment under certain conditions. The review acknowledges these risks and calls for additional research to optimize production methods to ensure the material's safety and efficacy in medical and environmental settings.

Advancing Medical Diagnostics

One of the direct medical applications examined is biochar's use in creating electrical sensors and biosensors. The material's unique electrical and chemical properties make it a suitable component for developing sensitive, low-cost diagnostic tools. These sensors can detect specific biomarkers, such as glucose in saliva or inflammatory proteins in blood, offering a convenient alternative to more complex laboratory tests and improving the accessibility of medical monitoring.

A Promising Future in Drug Delivery

The review identifies drug delivery as one of the most compelling medical applications for biochar. Its porous structure and easily modifiable surface make it an ideal nanocarrier for transporting medications within the body. Compared to other common nanocarriers like liposomes or polymers, biochar offers advantages in stability, production cost, and versatility. The authors point to a successful study where a biochar-based hydrogel was used for the long-term, controlled release of glaucoma medication, demonstrating its potential for treating chronic diseases that require consistent dosing.

Charting a Course for Future Research

The researchers conclude that employing biochar in drug delivery systems and for the sustainable treatment of medical waste are two of the most promising areas for future development. The material's properties could be adapted to manage other chronic conditions, such as age-related macular degeneration or diabetes, which rely on regular and targeted medication. This review establishes a clear framework for further scientific inquiry into the medical applications of this versatile carbon material.

Corresponding Author:

Chen Zhao and Shujie Zhang

Original Source:

https://doi.org/10.1007/s44246-023-00066-0

Contributions:

Shujie Zhang provided idea for the article. Qiao Zhuo performed the literature search and data analysis. Shujie Zhang and Chen Zhao revised the manuscript. Shujie Zhang and Chen Zhao supervised the progress of the whole project. All writers provided feedback on earlier drafts of the manuscript after Qiao Zhuo wrote the original draft. All authors have read and approved the final draft.