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Method of producing biogenic silica nanoparticles

a technology of biogenic silica and nanoparticles, applied in the field of agrinanotechnology, can solve the problems of large quantity required, major sustainability problems, and hazardous methods

Active Publication Date: 2016-08-11
KING SAUD UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a method for producing small silica nanoparticles from plant materials such as millet, sorghum, and pearl millet. These nanoparticles are made by treating the plant materials with acid and then heating them in a special autoclave under pressure. The result is a type of silica that is small and safe. The method may have various uses such as in the production of paints and coatings.

Problems solved by technology

Silica nanoparticles (SiO2-NPs) are used in numerous applications and, as a consequence, large quantities are required.
In large scale production of silica, quartz sand is treated with sodium carbonate at 1300° C. This method is hazardous to the environment because it emits a large quantity of CO2 gas.
Moreover, presently there is a major problem in sustainability due to the generation of a large quantity of agricultural waste.
However, huge quantity of agricultural waste management is difficult and represents a major challenge.
The improper usage of agricultural wastes creates an ecological contamination.

Method used

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  • Method of producing biogenic silica nanoparticles
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  • Method of producing biogenic silica nanoparticles

Examples

Experimental program
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example1

Materials and Methods

[0033]The seed hulls of Eleusine coracana, Sorghum bicolor, and Pennisetum glaucum were collected from a post-harvesting mill, in Karur, Tamil Nadu (India). The collected materials were ground and sieved using 18 mesh size for further studies. Total silica content of plant's seed hulls was quantified adopting AOAC procedures.

example 2

Cell Culture

[0034]Human mesenchymal stem cells (hMSc) were obtained from Thermo Scientific Hyclone (USA). The cells were cultured in DMEM medium supplemented with 10% bovine serum, 100 μg / mL of penicillin and 100 μg / mL of streptomycin in 96-well culture plates at 37° C. in a humidified atmosphere containing 5% CO2. All experiments were performed with cells from 15 passages or less.

example 3

Preparation of Biogenic Silica Nanoparticle from Plant Materials

[0035]Approximately 100 grams of the selected seed hulls were mixed with 500 ml of 1 N HC1 in separate conical flasks. These mixtures were transferred to an autoclave and maintained at 120° C. for 2 hours under pressurized (15 lb) conditions. The acid-pretreated plant's seed hulls was isolated and washed with Milli-Q water to remove the hydrochloric acid. Residue from the acid-pretreated seed hulls were dried and subsequently calcinated at temperatures of 500° C., 600° C., and 700° C. for 1 hour using a muffle furnace.

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Abstract

A method of producing biogenic silica nanoparticles comprises pretreating seed hulls of a biogenic source with an acid to form acid-treated seed hulls; placing the acid-treated seed hulls in an autoclave at a temperature greater than 100° C. for about 2 hours under a fixed pressure; isolating the seed hulls; washing the seed hulls with water; air drying the seed hulls; calcining the seed hulls at a temperature range of 500° C. to 700° C. for at least one hour in a furnace to produce biogenic silica nanoparticles. The biogenic silica nano-particles are amorphous and biocompatible possessing a particle sizes in the range of 25-75 nm.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to agri-nanotechnology, and particularly to a method of preparing biogenic silica nanoparticles from the seed hulls of various plants.[0003]2. Description of the Related Art[0004]Nanomaterials, defined as particles with a size of less than 100 nm, have been useful in various industries, including, electrical, textile, medicine, cosmetics, agriculture and food. Nanomaterials have unique physiochemical properties. Silica is the second most abundant element on earth. Silica nanoparticles (SiO2-NPs) have been used in various applications including catalysis, pigments, thin film substrates, thermal insulators, pesticides, food additives, drug delivery, gene therapy, molecular imaging and additives in plastics. Silica plays an important physiological role in plants; as an alleviator of biotic and abiotic stress. Silicon supplement diets have increased the bone mineral density in women, increased ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C01B33/18
CPCC01B33/126C01P2004/64C01B33/18C01B33/12
Inventor ALSHATWI, ALI ABDULLAHATHINARAYANAN, JEGANPERIASAMY, VAIYAPURI SUBBARAYAN
Owner KING SAUD UNIVERSITY