Homogeneous hydrolytic degradation of poly(lactic-co-glycolic acid) microspheres: Mathematical modeling

Quantification of Microsphere Drug Release by Fluorescence Imaging with the FRET System

Accurately measuring drug and its release kinetics in both in vitro and in vivo environments is crucial for enhancing therapeutic effectiveness while minimizing potential side effects. Nevertheless, the real-time visualization of drug release from microspheres to monitor potential overdoses remains a challenge. The primary objective of this investigation was to employ fluorescence imaging for the real-time monitoring of drug release from microspheres in vitro, thereby simplifying the laborious analysis associated with the detection of drug release. Two distinct varieties of microspheres were fabricated, each encapsulating different drugs within PLGA polymers. Cy5 was selected as the donor, and Cy7 was selected as the acceptor for visualization and quantification of the facilitated microsphere drug release through the application of the fluorescence resonance energy transfer (FRET) principle. The findings from the in vitro experiments indicate a correlation between the FRET fluorescence alterations and the drug release profiles of the microspheres.

Accelerated hydrolytic degradation of ester-containing biobased epoxy resins

Biobased epoxy resins, derived from lignin, phenolic acids, and vegetable oils, exhibited rapid degradation through hydrolysis in basic solution.

The influence of bioactive additives on polylactide accelerated degradation

The aim of the research was to study the influence of the bioactive modifiers such as 7 wt.% of micrometric tricalcium phosphate (TCP) and 0.3 wt.% of nanometric hydroxyapatite (HAP) on the accelerated degradation process of composite resorbable implants based on poly(L-lactide) (PLA) matrix. The degradation was assessed on the basis of microstructural, structural and mechanical alterations. The measure of the PLA degradation progress was the gradual decrease in its molecular weight and mechanical strength. As the degradation proceeded, the plastic properties of materials decreased. In the case of composites such changes took place faster, which implies the accelerating influence of modifiers on the degradation process. Moreover, modifiers act as crystallization seeds, accelerating and stimulating the matrix organization and appearance of crystalline areas. The properties of the two composites differ. Adding TCP alone influenced the structural changes in the polymer more significantly than the addition of TCP/HAP, thus affecting the faster degradation.