scholarly journals Antioxidant capacity and quantification analysis of chemical constituents isolated from Tetrastigma hemsleyanum Leaves

2021 ◽  
Vol 78 (3) ◽  
pp. 361-371
Author(s):  
Chong-lu Sun ◽  
Shi-min Li ◽  
Song-lin Yu ◽  
Ying-xin Yang ◽  
Yu-jiong Zhang ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Chemical Constituents ◽  
Tetrastigma Hemsleyanum ◽  
Quantification Analysis

scholarly journals Bee breads from two regions of Eastern Ukraine: composition, physical properties and biological activities

2019 ◽  
Vol 37 (No. 1) ◽  
pp. 9-20
Author(s):  
Roman Bleha ◽  
Tetiana Shevtsova Shevtsova ◽  
Vojtěch Kružík ◽  
Tereza Škorpilová ◽  
Ivan Saloň ◽  
...  
Keyword(s):  
Physical Properties ◽  
Antioxidant Capacity ◽  
Biological Activities ◽  
Chemical Constituents ◽  
Morphometric Parameters ◽  
Sem Images ◽  
Bee Bread ◽  
Specific Contribution ◽  
Ft Raman

Five samples of polyfloral bee bread originated from two regions of Eastern Ukraine were characterised by microscopic (SEM) and spectroscopic (FT MIR ATR, FT NIR, FT Raman and Vis) methods. Identification of pollens was based on the SEM images. Spectral differences were interpreted in terms of specific contribution of the main chemical constituents (proteins, phenolics, sugars, etc.) and pigments (flavonoids and carotenoids) of bee breads. PCA of FT NIR and Vis data was used for discrimination of bee bread samples according to botanical sources. The morphometric parameters, antioxidant capacity and prebiotic ef fects of bee breads were also studied. Obtained results expand the knowledge in the composition and properties of this beekeeping product.

Chemical Constituents of the Rhizomes of Tetrastigma hemsleyanum

2015 ◽  
Vol 51 (6) ◽  
pp. 1077-1079 ◽  
Author(s):  
Hong-Xin Liu ◽  
Luan He ◽  
Ri-Ming Huang ◽  
Sheng-Xiang Qiu
Keyword(s):  
Chemical Constituents ◽  
Tetrastigma Hemsleyanum

Effect of Sintered Magnesium Substituted Biphasic Calcium Phosphate (Mg-BCP)

2020 ◽  
Vol 1010 ◽  
pp. 567-572
Author(s):  
M.H.M. Marahat ◽  
Hasmaliza M. Mohamad ◽  
Shah Rizal Kasim
Keyword(s):  
Calcium Phosphate ◽  
Biphasic Calcium Phosphate ◽  
Chemical Constituents ◽  
Precipitation Method ◽  
Sintered Pellet ◽  
Mg Doping ◽  
Before And After ◽  
Quantification Analysis ◽  
The Stability ◽  
Mg Doped

Biphasic Calcium Phosphate (BCP) is a ceramic material that consisting of two phases which is Hydroxyapatite (HA) and β-Tricalcium Phosphate (β-TCP). In this work, BCP and Mg-BCP (Mg Doped) was synthesized using aqueous precipitation method at standard room temperature and pressure. The synthesized powder was pressed into pellet and sintered at three consecutive temperatures of 800 °C, 900 °C, and 1000 °C. The sintered pellet was characterized using XRD to obtained the quantification analysis on phases presence and to study the crystal orientation of HA and β-TCP before and after Mg doping was introduced. FTIR was used to determine chemical constituents of synthesized powders. Diameter shrinkage analysis was performed to study the effect of temperatures on the densification of the pellet body and SEM was used to observed the morphology of each pellet. Based on the XRD result, the Mg doping is affecting the stability of the phases presence and the crystal lattice creating a distortion due to the substitution of smaller Mg ion. Analysis on the SEM morphology have shown that Mg doped BCP resulting a dense structure with less formation of porosity, necking was formed clearly at temperatures of 900 °C to 1000 °C.

Aroeira fruit (Schinus terebinthifolius Raddi) as a natural antioxidant: Chemical constituents, bioactive compounds and in vitro and in vivo antioxidant capacity

2020 ◽  
Vol 315 ◽  
pp. 126274 ◽  
Author(s):  
Vanessa Sales de Oliveira ◽  
Ivanilda Maria Augusta ◽  
Marcos Vinícius da Conceição Braz ◽  
Cristiano Jorge Riger ◽  
Edlene Ribeiro Prudêncio ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Bioactive Compounds ◽  
Chemical Constituents ◽  
Natural Antioxidant ◽  
Schinus Terebinthifolius

scholarly journals Qualitative and Quantitative Analysis for the Chemical Constituents of Tetrastigma hemsleyanum Diels et Gilg Using Ultra-High Performance Liquid Chromatography/Hybrid Quadrupole-Orbitrap Mass Spectrometry and Preliminary Screening for Anti-Influenza Virus Components

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
FuJuan Ding ◽  
JiangTing Liu ◽  
RuiKun Du ◽  
QinHui Yu ◽  
LiLi Gong ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
High Performance Liquid Chromatography ◽  
Influenza Virus ◽  
Liquid Chromatography ◽  
Quantitative Analysis ◽  
High Performance ◽  
Chemical Constituents ◽  
Clinical Effects ◽  
Tetrastigma Hemsleyanum ◽  
Orbitrap Mass Spectrometry

Tetrastigma hemsleyanum Diels et Gilg (T. hemsleyanums) is a kind of traditional folk medicinal plant which has been used widely in China for its antivirus, antitumor, and other clinical effects. In this study, ultra-high performance liquid chromatography coupled with hybrid quadrupole-orbitrap mass spectrometry (UPLC-Q-Exactive/MS) was utilized to analyze the chemical constituents of T. hemsleyanums. Fifty-one constituents were clarified, including flavonoids, anthraquinones, esters, fatty acids, phenols, and catechins. In the subsequent quantitative analysis, the contents of ten compounds of rutin, kaempferol, astragalin, quercitrin, quercetin, vitexin-rhamnoside, isorhamnetin, vitexin, emodin-8-O-β-D-glucoside, and isoquercetin in 18 batches of T. hemsleyanums collected from different places of cultivation were determined. Meanwhile, anti-influenza virus bioactivity in vitro of the above samples was detected with Gaussia Luciferase viral titer assay. It was found that the antiviral bioactivity varied from batches to batches in accordance with content difference of the chemical constituents in T. hemsleyanums. Correlation analysis was performed with SPSS software for the association between LC-MS chemometrics and bioactivity of influenza virus inhibition, and 8 constituents of flavonoids showed positive correlation coefficient, which may provide a valuable clue for searching potential antiviral components in T. hemsleyanums.

scholarly journals Effect of UV-C Irradiation, Storage and Subsequent Cooking on Chemical Constituents of Fresh-Cut Potatoes

Foods ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1698
Author(s):  
Zdenka Pelaić ◽  
Zrinka Čošić ◽  
Sandra Pedisić ◽  
Maja Repajić ◽  
Zoran Zorić ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Chlorogenic Acid ◽  
Chemical Constituents ◽  
Sodium Ascorbate ◽  
Storage Duration ◽  
Applied Dose ◽  
Fresh Cut ◽  
And Storage ◽  
Uv C ◽  
Potato Slices

UV-C irradiation successfully reduces the growth of microorganisms, but it can also affect the content of phenolics and sugars of fresh-cut potatoes (FCP). This could consequently alter antioxidant capacity of FCP or its potential for acrylamide formation. Therefore, this paper investigates the influence of UV-C irradiation on the content of phenolics [chlorogenic acid (CA)] and individual sugars during storage of FCP as well as after cooking. Acrylamide was also monitored in FCP after frying. Potato slices pre-treated with sodium ascorbate solution and vacuum-packaged were UV-C irradiated for 0, 3, 5, and 10 min in order to obtain irradiation doses of 0, 1.62, 2.70, and 5.40 kJ m−2, respectively, stored for 23 days (+6 °C), and subsequently boiled and fried. As the applied dose and storage duration increased, the CA content in raw FCP decreased (it retained for 75.53–88.34%), while the content of sugars as well as acrylamide in fried FCP increased. Although the increase was the most noticeable at the applied dose of 2.70 kJ m−2, the acrylamide content was always below proposed limit. Boiling and frying reduced the content of CA and sugars. In spite of certain alterations, applied doses of irradiation can ensure acceptable product in regard to phenolics and sugars, and acrylamide content particularly.

scholarly journals Antioxidant Activity and Flavonoids Identification by LC-MS/MS Analysis in Leaf Extract from Trattinnickia rhoifolia Willd

2019 ◽  
Vol 8 (2) ◽  
pp. 13-34
Author(s):  
Lilian Marigo Magalhaes ◽  
Valeria Dornelles Gindri Sinhorin ◽  
Camila Cristina Pereira de Souza ◽  
Rogério de Campos Bicudo ◽  
Adilson Paulo Sinhorin
Keyword(s):  
Oxidative Stress ◽  
Antioxidant Capacity ◽  
Leaf Extract ◽  
Chemical Constituents ◽  
Ethanolic Extract ◽  
Glutathione S Transferase ◽  
Hypolipidemic Action ◽  
Protein Thiols ◽  
First Time

The objectives of this work were to evaluate the antioxidant and hepatoprotective activities in the oxidative stress model induced by paracetamol in male Swiss mice, to evaluate the hypoglycemic and hypolipidemic action and to identify flavonoids in the leaves ethanolic extract from Trattinnickia rhoifolia. By the LC-MS / MS method, eight flavonoids were identified in the hydromethanolic (HM) and ethyl acetate (EA) fractions, except for Amentoflavone, the flavonoids Apigenin, Canferol, Luteolin, Quercetin, Quercetin-3-β-d-glucoside, Rutin and Taxifoline were identified for the first time in this species. These fractions were evaluated for antioxidant capacity (DPPH— test) and their protective effect in vivo through the analysis of superoxide dismutase, catalase, glutathione-s-transferase, non-protein thiols, ascorbic acid, TBARS and carbonylated proteins. The data showed that EA has antioxidant capacity and superior oxidative stress repair in chemical and biological analyzes, besides hypoglycemic and hypolipidemic action. Thus, the present work contributes significantly to the literature, since it is the first study that identifies the chemical constituents and pharmacological properties of leaves extract from T. rhoifolia.

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