Fabrication of Biogenic Silica Nanostructures from Sorghum bicolor Leaves for Food Industry Applications
SILICON
Authors: Athinarayanan, Jegan; Jaafari, Saleh Ahmed Atiah Hamad; Periasamy, Vaiyapuri Subbarayan; Almanaa, Taghreed Naser Abdulaziz; Alshatwi, Ali A.
Abstract
Due to the large production of sorghum, the generation of associated agricultural residues, which contain high contents of silica, is inevitable. Also, these agricultural residues are not utilizing properly and it creates environmental pollution. Thus, we are utilizing the sorghum residues as a silica precursor to fabricating biogenic silica nanostructures using sequential processes. The physicochemical features of the synthesized BSNs, i.e., amorphous nature, surface functional groups, thermal stability, structure, and morphology, were analyzed using X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis, scanning electron microscopy, and transmission electron microscopy. The cytotoxic properties of the S. bicolor-derived BSNs were assessed using human colon carcinoma cells as an in vitro model and cell-based assays, including an 3-4,5-dimethylthiazol-2,5-diphenyltetrazolium bromide (MTT) assay, and acridine orange/ethidium bromide staining (AO/EB). The silica content of S. bicolor leaves was around 9.34%. We observed peaks at 1089 cm(-1) and 801 cm(-1) in the FTIR spectra of BSNs that corresponded to asymmetric, symmetric, and bending vibrations of O-Si-O. The BSNs had spherical morphology with diameters of 30-90 nm and an amorphous nature. The cytotoxic analysis suggested that BSNs do not induce cell death in colon carcinoma cells. Overall, the results suggested that BSNs exhibit good compatibility in colon cells, and may be applicable as an anti-caking agent in the food sector.
Local application of curcumin-loaded nanoparticles as an adjunct to scaling and root planing in periodontitis: Randomized, placebo-controlled, double-blind split-mouth clinical trial
CLINICAL ORAL INVESTIGATIONS
Authors: Perez-Pacheco, Cindy Grace; Fernandes, Natalie Ap Rodrigues; Primo, Fernando Lucas; Tedesco, Antonio Claudio; Bellile, Emily; Retamal-Valdes, Belen; Feres, Magda; Guimaraes-Stabili, Morgana Rodrigues; Rossa Jr, Carlos
Abstract
Objective Assess a single local application of curcumin-loaded nanoparticles as an adjunct to scaling and root planing (SRP) in nonsurgical periodontal treatment (NPT). Materials and methods Twenty healthy subjects with periodontitis received SRP+PLGA/PLA nanoparticles loaded with 50 mu g of curcumin (N-Curc) or SRP+empty nanoparticles. Probing pocket depth (PPD), clinical attachment level (CAL), and bleeding on probing (BOP) were monitored at baseline, 30, 90, and 180 days. IL-1 alpha, IL-6, TNF alpha, and IL-10 in the gingival crevicular fluid (GCF) were assessed by ELISA, and counts of 40 bacterial species were determined by DNA hybridization at baseline, 3, 7, and 15 days post-therapy. Results PPD, CAL, and BOP were similarly and significantly improved in both experimental groups. There was no difference in GCF cytokine levels between experimental groups, although IL-6 was decreased at 3 days only in the N-Curc group. NPT reduced counts of red complex bacterial species in both groups. Veillonella Parvula counts increased significantly only in N-Curc group at 7 days, whereas Aggregatibacter actinomycetemcomitans counts increased significantly only in the control group from day 3 to day 15. Conclusion We conclude that a single local administration of nanoencapsulated curcumin in periodontally diseased sites had no additive benefits to NPT.