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Preparation of Submicroscale Ag-Coated Cu Particles by Multi-Step Addition of Ag Plating Solution and Antioxidation Properties for Different Ag Shell Thicknesses

100%

Choi E. B. , Lee J.-H.

Archives of Metallurgy and Materials

2017

tom Vol. 62, iss. 2B

1137--1142

For application as a low-cost conductive filler material, submicroscale Cu@Ag particles were fabricated at room temperature without any reductants by a multi-step addition method using an ethylene glycol-based Ag plating solution. Scanning electron microscopy images of the Ag-coated Cu particles demonstrated the formation of discrete Ag particles less than 100 nm in size as well as a thin Ag coating on Cu particles, during the early addition steps. However, as the thickness of the Ag coating increased, the small Ag particles agglomerated into Ag coatings with an increase in the number of Ag plating steps. Owing to the absence of additives such as surfactants, a comparison between the microstructural images and calculations indicated increased agglomeration between fabricated Ag-coated Cu particles with an increase in the number of Ag plating steps. However, thermogravimetric-differential scanning calorimetry of the agglomerated Ag-coated Cu particles after the fifth addition of the Ag plating solution demonstrated their antioxidation behavior even after 70 min in air at 150°C.

Antioxidative and chelating properties of anthocyanins in Azolla imbricata induced by cadmium

72%

Dai L.-P. , Dong X.-J. , Ma H.-H.

nr 4

To investigate the biological activities of anthocyanins, which are induced by cadmium in A. imbricata, the antioxidant properties of anthocyanins were investigated using various antioxidant assays, namely 1,1 -diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity, 2,2'-azinobis-(3-ethylbenzthiazoline-6- sulfonic acid) (ABTS) radical scavenging activity, reducing power, and β-carotene bleaching assay. Results showed that anthocyanins exhibited excellent antioxidant activities in all assays and the EC₅₀ values of DPPH radicals scavenging, ABTS radicals scavenging, reducing power and β-carotene bleaching assay were 19.08, 10.69, 40.93, and 44.19 µg∙mL⁻¹, respectively. The Cd²⁺ chelation potency of anthocyanins was also investigated in vitro. Under given conditions, Cd²⁺ chelating ability of anthocyanins increased significantly with increase in contact time, anthocyanins concentration in dialysis tubing and Cd²⁺ concentration in solution. Based on these results, anthocyanins inducibly synthesized by Cd2 treatment was a powerful antioxidant, as well as Cd²⁺ chelator, might play a role in detoxification of Cd in A. imbricata.

The effects of bamboo leaf extract on growth performance, antioxidant traits, immune function and lipid metabolism of weaning piglets

72%

Zhang J. , Wang J. , Zhang L. , Wang T.

nr 3

The aim of this study was to evaluate the effects of dietary supplementation of bamboo leaf extract (BLE) on the growth performance, antioxidant traits, immune function, and lipid metabolism of weaning piglets. After weaning at 21 days, two hundred and forty healthy piglets (Large White × Landrance) were randomly assigned to 4 treatments with 6 pens and 10 piglets per pen. The control group (Ctr) received a maize-soyabean based diet, and the test groups received the control diet plus 0.5%, 1%, or 2% (w/w) BLE, respectively. The experiment was carried out for 5 weeks. At the end of it, average daily feed intake in the 1% BLE group was decreased (p < 0.05). Plasma concentrations of malondialdehyde were decreased with supplementation of 1% and 2% BLE. Immunoglobulin G concentrations and lysozyme activity in plasma were significantly increased in piglets supplemented with BLE. Diets with 1% and 2% BLE increased (p < 0.05) plasma concentrations of low density lipoprotein-cholesterol and reduced (P < 0.01) high density lipoprotein-cholesterol levels. Higher triglyceride concentrations were observed in the 0.5% (P < 0.01) and 2% (p < 0.05) BLE groups. In conclusion, these novel findings demonstrate that supplementation of BLE to the diet improved the antioxidant activity, immune function, and lipid metabolism of weaning piglets.

Wplyw posredni i bezposredni dzialania polifenoli wina na komorki srodblonka naczyn

58%

Stoclet J. C.

2001

tom 10

nr 1