Mechanochemical-assisted extraction of flavonoids from bamboo (Phyllostachys edulis) leaves

Publication year: 2013
Source:Industrial Crops and Products, Volume 43

Jie Xie, Yin-Shuang Lin, Xiang-Jun Shi, Xing-Yi Zhu, Wei-Ke Su, Ping Wang

An efficient mechanochemical-assisted extraction of flavonoids from bamboo (Phyllostachys edulis) leaves was developed. The highest recovery of flavonoids was achieved by grinding the leaves with Na2CO3 (12wt.%) and Na2B4O7·10H2O (2wt.%) for 10min, extraction with water at 25°C and liquid/solid ratio of 20mL/g for 15min. It was compared with heat reflux extraction and alkali extraction, both of which yielded lower recoveries of total flavonoids and representative flavonoids. Mechanochemical processing resulted in particle size reduction and intimate contact between the milled materials. Diffusion was enhanced and flavonoids were converted to be more hydrophilic at room temperature, which promoted the progression of subsequent extraction. It showed the advantages of efficiency, no organic solvent consumption and much lower extraction temperature.

Graphical abstract

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Graphical abstract Highlights


► Mechanochemical-assisted extraction achieved high recovery for flavonoids. ► Milling with solid reagents rendered flavonoids more hydrophilic at room temperature. ► Enhancement of diffusion and chemical transformations promoted subsequent extraction. ► Advantages are high efficiency, no organic solvent and room temperature.



Project Management for Environmental, Construction and Manufacturing Engineers(Munier)

A Manual for Putting Theory into Practice

As a companion to books on project-management theory, this book illustrates, in a down-to-earth, comprehensive style, how to put that theory into practice. It shows not only what needs to be done, but how to do it. In addition to the many examples that illustrate procedures, the book includes over 25 case studies, each one addressing a specific theme.Key topics, such as:project …

EcoProduction and Logistics

Emerging Trends and Business Practices
series:EcoProduction

Environmental awareness is driven mainly by the scarcity of natural resources and by more strict legal regulations. The modern enterprise policy should look at the relations between economic actions and ecological consequences. Ecoproduction is a new business approach which focuses on the most efficient and productive use of raw materials and natural resources in order to minimize footprints …

Nanosilica from rice husk: Extraction and characterization

Publication year: 2013
Source:Industrial Crops and Products, Volume 43

V.B. Carmona, R.M. Oliveira, W.T.L. Silva, L.H.C. Mattoso, J.M. Marconcini

Rice husk are generated from the rice cultivation. Silica is the major inorganic constituent of the rice husk, and by carrying out an acid chemical treatment followed by the process of burning, it is possible to extract high-surface area amorphous silica. This paper reports the extraction and characterization of nanosilica from two types of rice husk, namely agulhinha and cateto, using milder acid solutions. Thermogravimetry was used to characterize the burning behavior and to determine the activation energies. FT-IR results showed a good peak correlation between the commercial silica and burnt rice husk residue. There were found both nano- and microparticles with a large particle size distribution. The results showed the potential of silica extraction from rice husk, and additionally exhibited lower levels of corrosion damage to the reactor that generated weak acid residues due to the use of milder acid solutions.

Highlights

► We extracted amorphous white silica from rice husk using mild acid solutions. ► We have found both micro and nanostructure. ► Temperature of achievement of silica was less than 600°C. ► We determinate activation energies of rice husk combustion process.



Nanosilica from rice husk: Extraction and characterization

Publication year: 2013
Source:Industrial Crops and Products, Volume 43

V.B. Carmona, R.M. Oliveira, W.T.L. Silva, L.H.C. Mattoso, J.M. Marconcini

Rice husk are generated from the rice cultivation. Silica is the major inorganic constituent of the rice husk, and by carrying out an acid chemical treatment followed by the process of burning, it is possible to extract high-surface area amorphous silica. This paper reports the extraction and characterization of nanosilica from two types of rice husk, namely agulhinha and cateto, using milder acid solutions. Thermogravimetry was used to characterize the burning behavior and to determine the activation energies. FT-IR results showed a good peak correlation between the commercial silica and burnt rice husk residue. There were found both nano- and microparticles with a large particle size distribution. The results showed the potential of silica extraction from rice husk, and additionally exhibited lower levels of corrosion damage to the reactor that generated weak acid residues due to the use of milder acid solutions.

Highlights

► We extracted amorphous white silica from rice husk using mild acid solutions. ► We have found both micro and nanostructure. ► Temperature of achievement of silica was less than 600°C. ► We determinate activation energies of rice husk combustion process.



Cerebral Blood Flow, Metabolism, and Head Trauma

The Pathotrajectory of Traumatic Brain Injury

Traumatic brain injury (TBI) has caught the ear of the general public in the last few years in the context of injuries seen both in athletes and the military.  Despite TBI being situated as a critical problem in society for multiple decades, the underlying pathotrajectory of TBI has only recently been truly appreciated.  Only recently has TBI research begun to develop better models of TBI that …

Germ Cell Development in C. elegans

series:Advances in Experimental Medicine and Biology

Germ cells in sexually reproducing metazoa, through the germline lineage, are the route by which genetic material and cytoplasmic constituents are passed from one generation to the next in the continuum of life.  Chapters in this book review germ cell development in the model organism Caenorhabditis elegans, discussing the biology, the genetics and the molecular mechanisms for various …

Glioma Signaling

series:Advances in Experimental Medicine and Biology

Gliomas, developing in the brain from the transformed glial cells, are a very special kind of tumors, extremely refractory to conventional treatments. Therefore, for the development of new antitumor strategies, a better understanding of molecular mechanisms responsible for their biology, growth and invasion is still needed. Glioma Signaling is a text reference on cellular signaling processes …