Mesquite Gum as a Novel Reducing and Stabilizing Agent for Modified Tollens Synthesis of Highly Concentrated Ag Nanoparticles

Abstract

The synthesis that is described in this study is for the preparation of silver nanoparticles of sizes ranging from 10 nm to 30 nm with a defined shape (globular), confirmed by UV-vis, SEM, STEM and DLS analysis. This simple and favorable one-step modified Tollens reaction does not require any special equipment or other stabilizing or reducing agent except for a solution of purified mesquite gum, and it produces aqueous colloidal dispersions of silver nanoparticles with a stability that exceeds three months, a relatively narrow size distribution, a low tendency to aggregate and a yield of at least 95% for all cases. Reaction times are between 15 min and 60 min to obtain silver nanoparticles in concentrations ranging from 0.1 g to 3 g of Ag per 100 g of reaction mixture. The proposed synthetic method presents a high potential for scale-up, since its production capacity is rather high and the methodology is simple.

Comparative Reduction of Egg Yolk Cholesterol Using Anionic Chelating Agents

“…Mesquite gum (MG) has an ability to stabilize colloidal particles (1–100 µm), which it disperses or emulsifies. This property is manifested due to protein arabinogalactans, which allow adsorption in liquid–liquid interfaces [22,23]. The aim of this work was to reduce the amount of cholesterol present in egg yolk by preparing a complex of biopolymer mesquite gum–yolk and arabic gum–yolk, before comparing the results with cholesterol extraction using a solvent, and with physical separation of the granule using sodium chloride.…”

Development of Nano-Emulsions of Essential Citrus Oil Stabilized with Mesquite Gum

“…Tween and Span are proprietary names from CRODA™ (manufacturer of specialty chemicals); the numeric values are specific to the fatty acid derivative: oleic acid, for Tween 80, and lauric acid, for Span 20. Both surfactants are frequently used as emulsifiers for the food and cosmetic industry, having a very low toxicity and eco-friendly chemistry [11][12][13]. However, the affinity for polar (water) and non-polar (oil) groups is different for each non-ionic surfactant; according to the hydrophilic-lipophilic balance scale (HLB) [14], Tween 80 is hydrophilic (HLB: 15), while Span 20 is more lipophilic (HLB: 8.6).…”

“…The purification process of the mesquite gum begins with the selection of the cleanest pearls by visual inspection as indicated by literature [17]; afterwards the pearls were ground in a ceramic mortar until a powder was obtained. Then a 20% (wt) solution of this powder was prepared, which was filtered (in order to eliminate impurities like dust and pieces of wood), details of the process can be found in literature [12].…”

Получение стабилизированных наночастиц серебра и изучение их антимикробной и цитотоксической активности в отношении клеток гепатомы человека линии HepG2

“…[19][20][21]. Полисахариды также могут выступать в процессе синтеза наночастиц серебра в качестве восстановителей и стабилизаторов [22]. Одним из перспективных биополимеров, которые могут применяться для восстановления металлических наночастиц из солей серебра и их стабилизации, является доступный из природных источников, нетоксичный и водорастворимый биополимер арабиногалактан [23,24].…”

“…Синтез и характеристика наночастиц серебра Природные полисахариды могут выступать в процессе синтеза наночастиц металлов в качестве как восстановителей, так и стабилизаторов [22,23]. В настоящей работе для восстановления и стабилизации наночастиц серебра из раствора нитрата серебра был использован полисахарид арабиногалактан в сочетании с диоктилсульфосукцинатом натрия.…”