Cation-Dependent Gold Recovery with α-Cyclodextrin …
Herein, we report an alkali metal cation-dependent approach to gold recovery, facilitated by second-sphere coordination with eco-friendly α-cyclodextrin (α-CD). Upon mixing eight salts composed of Na+, K+, Rb+, or Cs+ cations and [AuX4]− (X = Cl/Br) anions with α-, β-, or γ-CD in water, co-precipitates form selectively from the three (out …
Supramolecular Gold Stripping from Activated Carbon Using …
We report the molecular recognition of the Au (CN)2- anion, a crucial intermediate in today's gold mining industry, by α-cyclodextrin. …
α-Cyclodextrin functionalized silver nanoparticles as …
α-Cyclodextrin functionalized silver nanoparticles as colorimetric sensor for micro extraction and trace level detection of chlorpyrifos pesticide in fruits and vegetables. ... The physical and chemical properties of synthesized alpha-cyclodextrin stabilized gold nanoparticles (AuNPs/α-CD) were studied with various characterization techniques ...
Use of cyclodextrins to manipulate plasma membrane …
We review the evidence for the specific and non-specific effects of cyclodextrins and what is known about the mechanisms for cyclodextrin-induced cholesterol and phospholipid extraction. Finally, we discuss useful control strategies that may help to verify that the observed effects are due specifically to cyclodextrin-induced changes in ...
Analytical characterization of cyclodextrins: History, official …
Determination of alpha-, beta-, and gamma-cyclodextrin by high-performance liquid chromatography Dempun Kagaku, 25 ( 1978 ), pp. 19 - 23 Crossref Google Scholar
Making gold green: New non-toxic method for mining gold
The new process also can be used to extract gold from consumer electronic waste. ... "Alpha-cyclodextrin is the gold medal winner," Stoddart said. "Zhichang stumbled on a piece of magic for ...
Cornstarch May Provide Green Method to Extract Gold
Traditional leaching employs poisonous cyanide to dissolve and extract the gold locked up in mineral ore -- but the method is polluting and controversial. ... One of the team, Zhichang Liu, mixed a sugar named alpha-cyclodextrin, which is derived from cornstarch, with dissolved gold salt in the hopes of creating some sort of three …
(PDF) Gold Removal From Gold-Bearing Ore Using Alpha …
This paper explores the use of alpha cyclodextrin (α-CD) for gold extraction from gold-bearing ore in the Democratic Republic of Congo (D.R.C). The research aims …
Effects of alpha-cyclodextrin on cholesterol control and
Two such natural medicines include alpha-cyclodextrin (marketed as FBCx), a fibre derived from corn starch that has been found to bind triglycerides in the intestines to prevent its absorption, aiding weight maintenance and lipid control, and hydrolysed ginseng extract (marketed as GINST15), a formula containing high amounts of Compound K, a ...
Making gold green: New non-toxic method for mining gold …
The new process also can be used to extract gold from consumer electronic waste. ... "Alpha-cyclodextrin is the gold medal winner," Stoddart said. "Zhichang stumbled on a piece of magic for ...
Effects of α-Cyclodextrin on Cholesterol Control and …
Each participant received either 2 active products (α-cyclodextrin [αCD] plus hydrolyzed ginseng extract [HGE]), 1 active product and 1 placebo product (αCD plus placebo or placebo plus HGE), or 2 placebo products (placebo plus placebo). Participants and investigators were blinded as to which group the participant had been allocated.
(PDF) Selective isolation of gold facilitated by second-sphere
This discovery heralds a green host-guest procedure for gold recovery from gold-bearing raw materials making use of α-cyclodextrin-an inexpensive and environmentally benign carbohydrate.
Nanotechnology for Sustainable Raw Mineral Extraction and …
Nearly all gold-mining companies use this toxic gold (Au) leaching process to sequester the precious metal. Two test tubes were taken containing aqueous solutions—one is the starch-derived alpha-cyclodextrin, the other is a dissolved gold salt (called aurate)—and mixed them together in a beaker at room temperature.
Optimization Process of the Refractory Gold Ore Extraction …
The current work focuses on the extraction of gold using alpha-cyclodextrin (α-CD) from the Kimpese quarry in the Democratic Republic of the Congo, through an environmentally friendly gold process as … Expand. Save. Oxidative Decomposition of Silver Telluride (Ag2Te) Using Hypochlorite in Different Acid Environments.
(PDF) Selective isolation of gold facilitated by second-sphere
This discovery heralds a green host-guest procedure for gold recovery from gold-bearing raw materials making use of α-cyclodextrin-an inexpensive and …
Highly efficient and selective extraction of gold by …
transformation of gold salts into Au 0 was found by differential scan- ning calorimetry (DSC). These observations suggest that a reductive adsorption mechanism dominates the extraction process and ...
Gold mined using cornstarch
Gold mined using cornstarch. ... along with the incentive to mine it, the development of eco-friendly chemicals for its extraction and recovery becomes ever more important. ... have discovered a greener method to recover gold using alpha-cyclodextrin: a cheap and environmentally friendly carbohydrate derived from starch. Using scanning ...
Selective and rapid extraction of trace amount of gold from …
The leaching solution was obtained from 150 CPUs and the gold concentration was 755.9 ppm, and then JNM-100-AO (250 mg) was added to extract gold, followed by the desorption, reduction and ...
Supramolecular Gold Stripping from Activated Carbon …
We have demonstrated that this molecular recognition process between α -cyclodextrin and KAu(CN)2 can be applied to the stripping of gold from the surface of …
gold and uranium extraction from soil and electronic waste …
In a study, the metal coordination ability of α-CD was employed to complex gold and thus isolate and extract it from different matrices of acid-digests of electronic waste and soil [1]. The crude α-CD used was extracted from cassava and yam starch of the non-edible plant species using E. coli α-cyclodextrin glucanotransferase (α-CGTase), …
(PDF) Gold Removal From Gold-Bearing Ore Using Alpha-Cyclodextrin …
PDF | This paper explores the use of alpha cyclodextrin (α-CD) for gold extraction from gold-bearing ore in the Democratic Republic of Congo (D.R.C).... | Find, read and cite all the research you ...
Recognition of malathion pesticides in agricultural
Herein, a rapid, precise alpha-cyclodextrin (α-CD) based gold nanoparticles (AuNPs) for selective detection of malathion pesticides has been reported. These are organophosphorus pesticides (OPPs), that can cause a neurological disease by inhibiting the activity of acetylcholinesterase (AChE). It is important to exploit a quick and sensitive …
Supramolecular Gold Stripping from Activated Carbon Using …
We have demonstrated that this molecular recognition process between α-cyclodextrin and KAu(CN) 2 can be applied to the stripping of gold from the surface of …
'Nanotechnology gold rush'
The new process also can be used to extract gold from consumer electronic waste. ... He found that it was alpha-cyclodextrin, a cyclic starch fragment composed of six glucose units, that isolates gold best of all. "Alpha-cyclodextrin is the gold medal winner," Stoddart said. "Zhichang stumbled on a piece of magic for isolating …
Cation-Dependent Gold Recovery with α-Cyclodextrin …
Herein, we report an alkali metal cation-dependent approach to gold recovery, facilitated by second-sphere coordination with eco-friendly α-cyclodextrin (α …
Non-toxic corn starch could replace cyanide in gold mines
"Alpha-cyclodextrin is the gold medal winner," said Sir Fraser Stoddart, the professor of chemistry who led the research. "Zhichang stumbled on a piece of magic for isolating gold from ...
GOLD REMOVAL FROM GOLD-BEARING ORE USING …
This paper explores the use of alpha cyclodextrin (α -CD) for gold extraction from gold bearing ore in the Democratic Republic of Congo (D.R.C). ... Alpha cyclodextrin, Eco-friendly, Gold,
Cation-Dependent Gold Recovery with α-Cyclodextrin …
DOI: 10.1021/jacs.6b04986 Corpus ID: 207168227; Cation-Dependent Gold Recovery with α-Cyclodextrin Facilitated by Second-Sphere Coordination. @article{Liu2016CationDependentGR, title={Cation-Dependent Gold Recovery with $alpha$-Cyclodextrin Facilitated by Second-Sphere Coordination.}, author={Zhichang …
Recognition of malathion pesticides in agricultural
Herein, a rapid, precise alpha-cyclodextrin (α-CD) based gold nanoparticles (AuNPs) for selective detection of malathion pesticides has been reported. These are organophosphorus pesticides (OPPs), that can cause a neurological disease by inhibiting the activity of acetylcholinesterase (AChE). ... In this technique, the extraction method …
The Effect of Alpha-Cyclodextrin on Postprandial Glucose …
Alpha-cyclodextrin (αCD) is a bacterial product that is widely used as a food ingredient. In the European Union (EU), αCD is regulated as a dietary fiber with an authorized health claim "for contributing to the reduction of postprandial glycemic responses." ... Data extraction: For each included article, the means, standard errors, …