scholarly journals Simultaneous Preparation of Abundant Flavonol Triglycosides from Tea Leaves

Molecules ◽  
2020 ◽  
Vol 25 (21) ◽  
pp. 5140
Author(s):  
Zhou-Tao Fang ◽  
Yi-Qing Lv ◽  
Chu-Jun Song ◽  
Jing Jin ◽  
Jian-Liang Lu ◽  
...  
Keyword(s):  
Preparation Method ◽  
Low Cost ◽  
Flavonol Glycosides ◽  
Production Yield ◽  
Preparative Hplc ◽  
Tea Leaves ◽  
Uv Absorption Spectra ◽  
Nuclear Magnetic Resonance Spectra ◽  
High Production ◽  
Cost Of Time

Flavonol glycosides are important components of tea leaves, contributing to the bioactivities as well as bitterness and astringency of tea. However, the standards of many flavonol triglycosides are still not available, which restricts both sensory and bioactivity studies on flavonol glycosides. In the present study, we established a simultaneous preparation method of seven flavonol triglycoside individuals from tea leaves, which consisted of two steps: polyamide column enrichment and preparative HPLC isolation. The structures of seven flavonol triglycoside isolates were identified by mass and UV absorption spectra, four of which were further characterized by nuclear magnetic resonance spectra, namely, quercetin-3-O-glucosyl-rhamnosyl-glucoside, quercetin-3-O-rhamnosyl-rhamnosyl-glucoside, kaempferol-3-O-glucosyl-rhamnosyl-glucoside and kaempferol-O-rhamnosyl-rhamnosyl-glucoside. The purities of all isolated flavonol triglycosides were above 95% based on HPLC, and the production yield of total flavonol glycosides from dry tea was 0.487%. Our study provides a preparation method of flavonol triglycosides from tea leaves, with relatively low cost of time and solvent but high production yield.

To Eliminate Curtain Effect of FIB TEM Samples by a Combination of Sample Dicing and Backside Milling

2014 ◽  
Author(s):  
Jian-Shing Luo ◽  
Hsiu Ting Lee
Keyword(s):  
Sample Preparation ◽  
Focused Ion Beam ◽  
Preparation Method ◽  
Low Cost ◽  
Ion Beam ◽  
Sample Preparation Method ◽  
Site Specific ◽  
Dual Beam ◽  
Transmission Electron

Abstract Several methods are used to invert samples 180 deg in a dual beam focused ion beam (FIB) system for backside milling by a specific in-situ lift out system or stages. However, most of those methods occupied too much time on FIB systems or requires a specific in-situ lift out system. This paper provides a novel transmission electron microscopy (TEM) sample preparation method to eliminate the curtain effect completely by a combination of backside milling and sample dicing with low cost and less FIB time. The procedures of the TEM pre-thinned sample preparation method using a combination of sample dicing and backside milling are described step by step. From the analysis results, the method has applied successfully to eliminate the curtain effect of dual beam FIB TEM samples for both random and site specific addresses.

scholarly journals Mucuna pruriens for Parkinson's disease: Low-cost preparation method, laboratory measures and pharmacokinetics profile

2016 ◽  
Vol 365 ◽  
pp. 175-180 ◽  
Author(s):  
Erica Cassani ◽  
Roberto Cilia ◽  
Janeth Laguna ◽  
Michela Barichella ◽  
Manuela Contin ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Preparation Method ◽  
Low Cost ◽  
Mucuna Pruriens ◽  
Laboratory Measures

scholarly journals Adsorption of chromium (Cr) from tannery wastewater using low-cost spent tea leaves adsorbent

2018 ◽  
Vol 8 (5) ◽  
Author(s):  
Md. Nur-E-Alam ◽  
Md. Abu Sayid Mia ◽  
Farid Ahmad ◽  
Md. Mafizur Rahman
Keyword(s):  
Low Cost ◽  
Tannery Wastewater ◽  
Tea Leaves ◽  
Spent Tea Leaves

scholarly journals Preparation of ZnO@TiO2 nanotubes heterostructured film by thermal decomposition and their photocatalytic performances

RSC Advances ◽  
2018 ◽  
Vol 8 (15) ◽  
pp. 8064-8070 ◽  
Author(s):  
Yulong Liao ◽  
Kaibin Zhang ◽  
Xiaoyi Wang ◽  
Dainan Zhang ◽  
Yuanxun Li ◽  
...  
Keyword(s):  
Water Pollution ◽  
Thermal Decomposition ◽  
Zno Nanoparticles ◽  
Pollution Control ◽  
Tio2 Nanotubes ◽  
Preparation Method ◽  
Low Cost ◽  
Water Pollution Control ◽  
Photocatalytic Performances ◽  
Positive Effect

Efficient and low-cost preparation method of ZnO nanoparticles@TiO2 NT heterojunction films, has a positive effect on water pollution control.

scholarly journals Whole Conversion of Soybean Molasses into Isomaltulose and Ethanol by Combining Enzymatic Hydrolysis and Successive Selective Fermentations

Biomolecules ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 353
Author(s):  
Zhi-Peng Wang ◽  
Lin-Lin Zhang ◽  
Song Liu ◽  
Xiao-Yan Liu ◽  
Xin-Jun Yu
Keyword(s):  
Low Cost ◽  
Rhizomucor Miehei ◽  
Pichia Stipitis ◽  
Raffinose Family Oligosaccharides ◽  
Alternative Substrate ◽  
Soy Molasses ◽  
High Production ◽  
Novel Strategy ◽  
High Production Cost ◽  
High Sucrose

Isomaltulose is mainly produced from sucrose by microbial fermentation, when the utilization of sucrose contributes a high production cost. To achieve a low-cost isomaltulose production, soy molasses was introduced as an alternative substrate. Firstly, α-galactosidase gene from Rhizomucor miehei was expressed in Yarrowia lipolytica, which then showed a galactosidase activity of 121.6 U/mL. Under the effects of the recombinant α-galactosidase, most of the raffinose-family oligosaccharides in soy molasses were hydrolyzed into sucrose. Then the soy molasses hydrolysate with high sucrose content (22.04%, w/w) was supplemented into the medium, with an isomaltulose production of 209.4 g/L, and the yield of 0.95 g/g. Finally, by virtue of the bioremoval process using Pichia stipitis, sugar byproducts in broth were transformed into ethanol at the end of fermentation, thus resulting in high isomaltulose purity (97.8%). The bioprocess employed in this study provides a novel strategy for low-cost and efficient isomaltulose production from soybean molasses.

High production-yield solid-state carbon dots with tunable photoluminescence for white/multi-color light-emitting diodes

2019 ◽  
Vol 64 (23) ◽  
pp. 1788-1794 ◽  
Author(s):  
Haoqiang Song ◽  
Xuejian Liu ◽  
Boyang Wang ◽  
Zhiyong Tang ◽  
Siyu Lu
Keyword(s):  
Solid State ◽  
Carbon Dots ◽  
Light Emitting Diodes ◽  
Production Yield ◽  
Light Emitting ◽  
High Production

Tea Waste: A New Adsorbent for the Removal of Reactive Dyes from Textile Wastewater

2013 ◽  
Vol 803 ◽  
pp. 26-29 ◽  
Author(s):  
Antonio Zuorro ◽  
Maria Laura Santarelli ◽  
Roberto Lavecchia
Keyword(s):  
Low Cost ◽  
Dye Adsorption ◽  
Reactive Dyes ◽  
Textile Wastewater ◽  
Tea Leaves ◽  
Thermally Activated ◽  
Reactive Blue 19 ◽  
Reactive Green 19 ◽  
Spent Tea Leaves

Spent tea leaves (STL), a valueless waste produced during the manufacturing of tea beverages, were investigated as a potential low-cost adsorbent for the removal of the azo dyes Reactive Blue 19 (RB19), Reactive Red 120 (RR 120), Reactive Violet 5 (RV5) and Reactive Green 19 (R19) from wastewater. Untreated STL showed very low removal efficiency (< 7%), while a significant increase in dye adsorption was observed when they were thermally activated. Heating STL to 300 °C for 1 hour resulted in removal efficiencies ranging from 68.5 to 98.4%. Characterization of the waste by FTIR and TG/DTA indicated that major structural and/or chemical changes of the cellulose and hemicellulose components of STL occurred during heating.

Simple and low-cost preparation method for highly dispersed Pd/TiO2 catalysts

2004 ◽  
Vol 93-95 ◽  
pp. 645-650 ◽  
Author(s):  
Fuxiang Zhang ◽  
Jixin Chen ◽  
Xiu Zhang ◽  
Wenliang Gao ◽  
Ruicai Jin ◽  
...  
Keyword(s):  
Preparation Method ◽  
Low Cost ◽  
Highly Dispersed

scholarly journals Design and Fabrication of Wafer-Level Microlens Array with Moth-Eye Antireflective Nanostructures

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 747 ◽  
Author(s):  
Shuping Xie ◽  
Xinjun Wan ◽  
Bo Yang ◽  
Wei Zhang ◽  
Xiaoxiao Wei ◽  
...  
Keyword(s):  
Nanoimprint Lithography ◽  
Production Efficiency ◽  
Low Cost ◽  
Microlens Array ◽  
Wafer Level ◽  
Lens Array ◽  
Wafer Level Packaging ◽  
High Production ◽  
Aspherical Lenses ◽  
Profile Accuracy

Wafer-level packaging (WLP) based camera module production has attracted widespread industrial interest because it offers high production efficiency and compact modules. However, suppressing the surface Fresnel reflection losses is challenging for wafer-level microlens arrays. Traditional dielectric antireflection (AR) coatings can cause wafer warpage and coating fractures during wafer lens coating and reflow. In this paper, we present the fabrication of a multiscale functional structure-based wafer-level lens array incorporating moth-eye nanostructures for AR effects, hundred-micrometer-level aspherical lenses for camera imaging, and a wafer-level substrate for wafer assembly. The proposed fabrication process includes manufacturing a wafer lens array metal mold using ultraprecise machining, chemically generating a nanopore array layer, and replicating the multiscale wafer lens array using ultraviolet nanoimprint lithography. A 50-mm-diameter wafer lens array is fabricated containing 437 accurate aspherical microlenses with diameters of 1.0 mm; each lens surface possesses nanostructures with an average period of ~120 nm. The microlens quality is sufficient for imaging in terms of profile accuracy and roughness. Compared to lenses without AR nanostructures, the transmittance of the fabricated multiscale lens is increased by ~3% under wavelengths of 400–750 nm. This research provides a foundation for the high-throughput and low-cost industrial application of wafer-level arrays with AR nanostructures.

Aluminium Induced Crystallization of Amorphous Silicon via Solution Derived Catalyst

2013 ◽  
Vol 481 ◽  
pp. 3-6
Author(s):  
Ian Yi Yu Bu
Keyword(s):  
Annealing Temperature ◽  
Preparation Method ◽  
Low Cost ◽  
Vacuum Solution ◽  
Solution Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Induced Crystallization ◽  
Probe Measurements

In this paper, aluminum induced crystallization (AIC) was studied by examining the effect of using solution derived AlCl3 catalyst. Such catalyst preparation method offers possibility of low-cost, non-vacuum solution process and allows examination of the role of alumina on the AIC process. The deposited AIC films were examined by using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Raman spectroscopy, X-ray diffraction (XRD) and four probe measurements. It was found that AIC process is highly dependent on annealing temperature and can occur at annealing temperatures above 500°C through Al2O3 formation. Based on the presented data, a possible growth model is proposed to clarify AIC mechanism.

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