Supramolecular chemistry offers an exciting opportunity to assemble materials with molecular precision. However, there remains an unmet need to turn molecular self-assembly into functional materials and devices. Harnessing the inherent properties of both disordered proteins and graphene oxide (GO), we report a disordered protein-GO co-assembling system that through a diffusion-reaction process and disorder-to-order transitions generates hierarchically organized materials that exhibit high stability and access to non-equilibrium on demand. We use experimental approaches and molecular dynamics simulations to describe the underlying molecular mechanism of formation and establish key rules for its design and regulation. Through rapid prototyping techniques, we demonstrate the system’s capacity to be controlled with spatio-temporal precision into well-defined capillary-like fluidic microstructures with a high level of biocompatibility and, importantly, the capacity to withstand flow. Our study presents an innovative approach to transform rational supramolecular design into functional engineering with potential widespread use in microfluidic systems and organ-on-a-chip platforms.

Silk fibroin is a protein with a unique combination of properties and is widely studied for biomedical applications. The extraction of fibroin (degumming) from the silk filament impacts the properties of the outcoming material. The degumming can be conducted with different procedures. Among them, the most used and studied procedure in the research field is the alkali degumming with sodium carbonate (Na2CO3). In this study, by the use of a statistical method, namely, design of experiment (DOE), we characterized the Na2CO3 degumming, taking into consideration the main process factors involved and changing them within a selected range of values. We considered the process temperature and time, the salt concentration, and the number of baths used, testing the impact of these variables on the fibroin properties by building empirical models. These models not only took into consideration the direct effect of the process factors but also their combined effect, which are not conventionally detectable with other methods. The weight loss and the amount of sericin removed in the process were determined and used as a measure of the effectiveness of the process. The secondary structure, the molecular weight, the diameter of fibers, and their morphology and mechanical properties were studied with the intent to correlate the macroscopical properties with the structural changes. We report, for the first time, the possibility to effectively remove all sericin from the silk fibroin using Na2CO3, using a process that requires less salt, water, and energy, in comparison with the standard alkali protocol, making this technique overall more environmentally sustainable; in addition, we have demonstrated the possibility to tune the material properties by varying the degumming conditions and even to optimize them with empirical statistically based equations that allow one to directly set the optimal process parameters. The major effect on the macroscopical properties (such as the ultimate strength and Young’s modulus) has been proved to be correlated with the removal of sericin instead of the microstructural variations. Finally, a ready-to-use table with a set of optimized degumming procedures to maximize or minimize the studied properties was provided.

Materials that combine the functionalities of both of proteins and graphene are of great interest for the engineering of biosensing, drug delivery, and regenerative devices. Graphene oxide (GO) offers an opportunity to design GO-protein interactions but the need for harsh reduction processes to enable GO photoexcitation remains a limitation. A disinfector-assisted low temperature method to reduce GO-protein materials and fabricate surgical dressings with tuneable photothermal efficiency and bioactive properties for the postoperative treatment of melanoma is reported. The approach harnesses the capacity of 70% ethanol to penetrate the protein shell of microorganisms to infiltrate GO-protein complexes and reduce GO at low temperature (85 °C) while maintaining the material structure and bioactivity. Both experiments and coarse-grained simulations are used to describe the reduction process and assess the material properties. In vitro and in vivo validation revealed the capacity of the dressings to prevent tumor recurrence and promote healing after tumor resection.

Nowadays, whenever is possible and as alternative to open spine surgery, minimally invasive procedures are preferred to treat spinal cord injuries (SCI), with percutaneous injections or small incisions, that are faster, less traumatic and require less recovery time. Injectable repair systems are based on materials that can be injected in the lesion site, can eventually be loaded with drugs or even cells, and act as scaffolds for the lesion repair. The review analyzed papers written from 2010 onwards on injectable materials/systems used/proposed for the regenerative and combinatorial therapies of SCI, and discusses the in vivo models that have been used to validate them.

Nowadays, laser scalpels are commonly used in surgery, replacing the traditional surgical scalpels for several applications involving cutting or ablating living biological tissue. Laser scalpels are generally used to concentrate light energy in a very small‐sized area; light energy is then converted in heat by the tissues. In other cases, the fiber glass tip of the laser scalpel is heated to high temperature and used to cut the tissues. Depending on the temperature reached in the irradiated area, different effects are visible in the tissues. In this study, we report the discovery and characterization of the light emitted by soft mammalian biological tissues from seconds to hours after laser surgery application. A laser diode (with hot fiber glass tip) working at 808 nm and commercially available for medical and dentistry applications was used. The irradiated tissues (red meat, chicken breast and fat) showed light emission in the visible range, well detectable with a commercial charge coupled device (CCD) camera. The time decay of the light emission, the laser power effects and the spectral features in the range 500 to 840 nm in the different tissues are here reported.