A mathematical model is proposed to simulate the drug release process from hydroxypropyl methyl cellulose (HPMC)-based pharmaceutical devices. The arbitrary Lagrangian-Eulerian (ALE) formulation is employed to describe its variable solution domain and moving boundary caused by matrix swelling. The ALE method is verified numerically. It is found that the swelling of the matrix plays a very important role in the drug release process. The release rate depends upon the diffusion constant, tablet geometry, matrix swelling behavior and some other design parameters. The obtained results are useful for understanding the relationship between the design parameters and drug release rate, which is the theoretical base of the controlled drug delivery.
Drug-loaded microspheres prepared from biomacromolecules have received considerable interest. In this article, we report a facile method for preparing ceftiofur-loaded gelatin-based microspheres for controlled release. We investigated the effects of factors, including the rotational speed, concentration of surfactant, concentration of gelatin, and ratio of water to oil (W/O), on the morphologies of gelatin microspheres and obtained the optimized conditions; for a typical average diameter of about 15 lm, these were 1000 rpm, a concentration of span 80 of 2.0%, a gelatin concentration of 20%, and a W/O of 1:20. Gelatin microspheres loaded with ceftiofur, ceftiofur-Na, and ceftiofur-HCl were prepared and characterized by scanning electron microscopy and laser light scattering.In vitro release studies were carefully performed for microspheres prepared with different crosslinker contents, loaded with different drugs, and blended with chitosan. The loaded ceftiofur showed an obviously longer release time compared with pure ceftiofur powder. A higher content of crosslinker led to a longer release time, but when the content reached 5%, the microspheres had a significantly cracked surface. The results also indicate that the blending of a small amount of chitosan could greatly prolong the release time.
Veterinary drug residues of common food (milk, meat) have posed serious threats to the environment and human health, making the quality and safety of agricultural, livestock, and aquatic products increasingly prominent. With the widespread use of veterinary drugs and the requirements for food safety, it has become urgent to detect veterinary drug residues in animal-derived foods. So far, few studies have systematically reviewed the progresses, challenges, and future directions in veterinary drug residue detection. A thorough review on the current advancements, challenges, and potential future directions of veterinary drug residue detection will be extremely beneficial and timely. This study reviewed recent developments of detection technology of veterinary drug residues. The current issues and challenges in veterinary drug residue detection were examined and highlighted. Finally, future proposals on directions and prospects for veterinary drug residue detection were suggested. High-throughput and high-sensitivity veterinary drug detection technology, sample pretreatment technology for rapid processing, and the fusion of multiple detection methods were recommended as the main directions for the future development of veterinary drug residue detection. It was suggested to develop the analysis and detection technologies of veterinary drug residue towards high automation, high sensitivity, and high throughput in the future. This review provides new ideas and strategies for the rapid development of animal husbandry industry and protecting consumers’ physical health and food safety.
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