The purpose of this study was to use agar as a multifunctional encapsulating material to allow drug and ferromagnetism to be jointly delivered in one nanoparticle. We successfully encapsulated both Fe3O4 and doxorubicin (DOX) with agar as the drug carrier to obtain DOX-Fe3O4@agar. The iron oxide nanoparticles encapsulated in the carrier maintained good saturation of magnetization (41.9 emu/g) and had superparamagnetism. The heating capacity test showed that the specific absorption rate (SAR) value was 18.9 ± 0.5 W/g, indicating that the ferromagnetic nanoparticles encapsulated in the gel still maintained good heating capacity. Moreover, the magnetocaloric temperature could reach 43 °C in a short period of five minutes. In addition, DOX-Fe3O4@agar reached a maximum release rate of 85% ± 3% in 56 min under a neutral pH 7.0 to simulate the intestinal environment. We found using fluorescent microscopy that DOX entered HT-29 human colon cancer cells and reduced cell viability by 66%. When hyperthermia was induced with an auxiliary external magnetic field, cancer cells could be further killed, with a viability of only 15.4%. These results show that agar is an efficient multiple-drug carrier, and allows controlled drug release. Thus, this synergic treatment has potential application value for biopharmaceutical carrier materials.
Taiwan Food and Drug Administration (TFDA) was established in 2010 as the nation's principal consumer product protection agency of food, drugs, medical devices, and cosmetics. By integrating 4 agencies (the Bureau of Food Safety, Bureau of Pharmaceutical Affairs, Bureau of Food and Drug Analysis, and Bureau of Controlled Drugs), TFDA holds the mission of protecting and promoting the public health through regulation modernization to enhance the availability of safe medical products and foods. To address the unmet medical needs and public health, TFDA has utilized regulatory science to evaluate review principles and risk management to properly oversee the overall life cycle of medicinal products. A lot of measures have been accomplished to build an efficient, transparent, and internationally harmonized regulatory system. With the first-in-the-world new drug afatinib approved in Taiwan, TFDA has successfully built up capacity and capability in the review and approval of new drugs. This article summarizes the efforts TFDA has been making in the domain of medicinal product management, highlighting policies and strategies for the future.
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