ABSTRACT
Morin is an antioxidant and anticancer flavonoid, extracted from natural sources, that may exert beneficial effects for several pathologies. Despite this, the administration of morin represents a challenge due to its low aqueous solubility. Mesoporous silica materials have emerged as biocompatible tools for drug delivery, as their pore size can be modulated for maximum surface area to volume ratio. In this contribution, we evaluate the ability of iron-modified mesoporous materials, for morin loading and controlled delivery. The SBA-15 and MCM-41 sieves were synthesized and modified with iron (metal content 4.02 and 6.27 % wt, respectivily). Characterization by transmission electron microscopy, XRD and UV-Vis revealed adequate pore size and agglomerates of very small metallic nanospecies (nanoclusters), without larger iron oxide nanoparticles. FT-IR spectra confirmed the presence of silanol groups in the solid hosts, which can interact with different groups present in morin molecules. SBA-15 materials were more efficient in terms of morin loading capacity (LC) due to their larger pore diameter. LC was more than 35% for SBA-15 materials when adsorptions studies were carried out with 9 mg of drug. Antioxidant activity were assayed by using DPPH test. Free iron materials presented a significate improvement as antioxidants after morin incorporation, reaching a scavenging activity of almost a 90%. On the other hand, in iron modified mesoporous materials, the presence of morin did not affect the scavenging activity. The results could be related with the formation of a complex between the flavonoid and the iron. Finally, biosafety studies using normal epithelial cells revealed that neither the loaded nor the unloaded materials exerted toxicity, even at doses of 1 mg/ml. These findings expand knowledge about mesoporous materials as suitable carriers of flavonoids with the aim of improving therapies for a wide range of pathologies.
Subject(s)
Flavones , Flavonoids , Neoplasms , Humans , Spectroscopy, Fourier Transform Infrared , Flavonoids/chemistry , Silicon Dioxide/chemistry , Antioxidants/chemistry , Iron , PorosityABSTRACT
Se realizó una lobectomía transoral vestibular endoscópica (TOETVA) en una paciente femenina de 53 años interesada particularmente en su resultado cosmético, que presentaba un nódulo de 40 mm en el lóbulo tiroideo izquierdo. Mostró una excelente evolución posoperatoria. Se realizó la revisión de la bibliografía acerca de este abordaje y se informa el primer caso del país.
A 53-year-old female patient with a 40-mm nodule in the left thyroid lobe underwent surgery using the transoral endoscopic thyroidectomy vestibular approach (TOETVA) because she was particularly interested in the cosmetic results. She evolved with excellent postoperative outcome. We review the literature dealing with this approach and report the first case in our country.
Subject(s)
Thyroidectomy , Thyroidectomy/methods , Research ReportABSTRACT
Mesoporous materials with superparamagnetic properties were successfully synthesized by two different methods: direct incorporation (DI) and wet impregnation (WI). The synthetized solids were evaluated as host of drugs for delivery systems and their physicochemical properties were characterized by XRD, ICP, N2 adsorption-desorption, spectroscopies of UV-Vis DR, FT-IR and their magnetic properties were measured. Indomethacin (IND) was incorporated into the materials and the kinetic of the release profiles was studied by applying the Pepas and Sahlin model. In this sense, materials modified by DI, particularly that with hydrothermal treatment, showed the higher adsorption capacity and slower release rate. This behavior could be associated to the synthesis method used that allowed a high percentage of silanol groups available in the solids surface, which can interact with the IND molecule. This feature coupled with the superparamagnetic behavior; make these materials very interesting for drug delivery systems.
