scholarly journals Grape Seeds Proanthocyanidins: Advanced Technological Preparation and Analytical Characterization

Antioxidants ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 418
Author(s):  
Paolo Morazzoni ◽  
Paola Vanzani ◽  
Sandro Santinello ◽  
Antonina Gucciardi ◽  
Lucio Zennaro ◽  
...  
Keyword(s):  
High Resolution Mass Spectrometry ◽  
Industrial Process ◽  
Gel Permeation Chromatography ◽  
Grape Seed ◽  
Direct Infusion ◽  
Grape Seeds ◽  
Flow Filtration ◽  
Process Patent ◽  
Shotgun Approach

A “green” solvent-free industrial process (patent pending) is here described for a grape seed extract (GSE) preparation (Ecovitis™) obtained from selected seeds of Veneto region wineries, in the northeast of Italy, by water and selective tangential flow filtration at different porosity. Since a comprehensive, non-ambiguous characterization of GSE is still a difficult task, we resorted to using an integrated combination of gel permeation chromatography (GPC) and electrospray ionization high resolution mass spectrometry (ESI-HRMS). By calibration of retention time and spectroscopic quantification of catechin as chromophore, we succeeded in quantifying GPC polymers up to traces at n = 30. The MS analysis carried out by the ESI-HRMS method by direct-infusion allows the detection of more than 70 species, at different polymerization and galloylation, up to n = 13. This sensitivity took advantage of the nanoscale shotgun approach, although paying the limit of missed separation of stereoisomers. GPC and MS approaches were remarkably well cross-validated by overlapping results. This simple integrated analytical approach has been used for quality control of the production of Ecovitis™. The emerging feature of Ecovitis™ vs. a popular benchmark in the market, produced by a different technology, is the much lower content of species at low n and the corresponding increase of species at high n.

scholarly journals Synthesis and Characterization of a Nano-Adsorbent Derivative Derived from Grape Seeds for Cadmium Ion Removal in an Aqueous Solution

Water ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 2896
Author(s):  
Alaa Jasim Mohammed ◽  
Mohd Hafiz Ibrahim ◽  
Syaizwan Zahmir Zulkifli ◽  
Jasim Mohammed Salman
Keyword(s):  
Chemical Properties ◽  
Grape Seed ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Grape Seeds ◽  
Solution Ph ◽  
Ion Removal ◽  
Physical And Chemical ◽  
Nano Adsorbent

Grape seeds were utilized as a source for nanoparticle adsorbents. The objective of this work was to prepare a nano adsorbent from grape seeds (GS) and FeCl2. The physical and chemical properties of grape seed ferrous oxide nanoparticles (GS-IONPs) were investigated. Batch adsorption was used to investigate the adsorption of cadmium from industrial water with different initial concentrations, solution pH and contact time. The adsorption isotherm data for Cd(II) on GS-IONPs were fitted to the Langmuir, Freundlich, and Temkin isotherm models. The data fit the Langmuir model well, with a maximum cadmium uptake of 16.3 mg/g. It was found that %removal of cadmium decreased from 98.0% to 88.0% as the initial concentration increased. The results revealed that the prepared adsorbent was effective in Cd(II) removal.

Synthesis and Characterization of Poly(N-arylenebenzimidazole sulfone)

2012 ◽  
Vol 174-177 ◽  
pp. 473-477
Author(s):  
Ye Wei Xu ◽  
Jie Tang ◽  
Guan Jun Chang ◽  
Fang Hua Zhu ◽  
Lin Zhang
Keyword(s):  
Nmr Spectroscopy ◽  
Chemical Structure ◽  
Polyphosphoric Acid ◽  
High Resolution Mass Spectrometry ◽  
Gel Permeation Chromatography ◽  
The Novel ◽  
Good Solubility ◽  
Nucleophilic Displacement ◽  
Ft Ir

Poly(N-arylenebenzimidazole sulfone), PNABIS, has been prepared via the aromatic nucleophilic displacement reaction of 1,4-bis(2-benzimidazolyl) benzene (BBIB) with bis(4-fluorophenyl) sulfone. BBIB was synthesized by the reaction of terephthalaldehydic acid with 1,2-phenylenediamine in polyphosphoric acid. The chemical structure of BBIB was confirmed by FT-IR, high resolution mass spectrometry (HRMS) and NMR spectroscopy. The characterization of the polymer was performed with FT-IR, NMR spectroscopy, gel permeation chromatography (GPC), thermogravimetric analysis (TGA) and solubility tests. The polymer was obtained in quantitative yield with Mn value 11000 and Mw value 25300, respectively. TGA measurements show that 5% weight loss temperature is 532 °C in nitrogen and 331 °C in air, respectively. In addition, the novel polymer exhibits good solubility, which can be dissolved in common organic solvent at room temperature.

Grape Seeds Extract as Brain Food: A Review

2017 ◽  
Vol 9 (1) ◽  
Author(s):  
Souad El Gengaihi ◽  
Doha H. Abou Baker
Keyword(s):  
Antioxidant Activities ◽  
Complex Mixture ◽  
Grape Seed Extract ◽  
Grape Seed ◽  
Seed Extract ◽  
Amyloid Peptide ◽  
Grape Seeds ◽  
Potential Benefits ◽  
Reduced Risk

Interest in the biological role of bioactive compounds present in medicinal herbs has increased over the last years. Of particular interest are plants that have an anti-Alzheimer activities. Several plants can be useful for Alzheimer (AD) management. Such as these which have anti-inflammatory activity, acetylcholinesterase (AChE) inhibitory action, antiapoptotic, slow the aggregation of amyloid peptide and antioxidant activities. Grape seed extract (GSE) is a complex mixture of several compounds, mostly represented by polyphenols and flavonoids. Their consumption is safe and is recognized to exert several health benefits. GS flavonoids have been associated with the reduced risk of chronic diseases, we present some findings on the potential benefits of GSE for the treatment of AD.

scholarly journals Molar mass determination of lignins and characterization of their polymeric structures by multi-detector gel permeation chromatography

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Evamaria C. Gaugler ◽  
Wolfgang Radke ◽  
Andrew P. Vogt ◽  
Dawn A. Smith
Keyword(s):  
Molar Mass ◽  
Lithium Bromide ◽  
Gel Permeation Chromatography ◽  
Mass Determination ◽  
Organosolv Lignin ◽  
Gel Permeation ◽  
Softwood Kraft Lignin ◽  
Polymeric Structures

AbstractMolar masses, Mark-Houwink-Sakurada (MHS) exponents, and refractive index increments (dn/dc) for three lignins were determined without derivatization by multi-detector gel permeation chromatography (GPC) in dimethylformamide (DMF) with 0.05 M lithium bromide (LiBr). The lack of effectiveness of fluorescence filters on molar mass determination by GPC-multi-angle laser light scattering (MALS) was confirmed for softwood kraft lignin (Indulin AT) and revealed for mixed hardwood organosolv lignin (Alcell) as well as soda straw/grass lignin (Protobind 1000). GPC with viscometry detection confirmed that these lignins were present as compact molecules. The MHS exponent α for Indulin AT and Alcell was in the order of 0.1. Additionally, the intrinsic viscosity of Protobind 1000 for a given molar mass was much lower than that of either Alcell or Indulin AT. This is the first report of dn/dc values for these three lignins in DMF with 0.05 M LiBr.

scholarly journals Phosphorus speciation analysis of fatty-acid-based feedstocks and fast pyrolysis biocrudes via gel permeation chromatography inductively coupled plasma high-resolution mass spectrometry

RSC Advances ◽  
2021 ◽  
Vol 11 (43) ◽  
pp. 26732-26738
Author(s):  
Victor Garcia-Montoto ◽  
Sylvain Verdier ◽  
David C. Dayton ◽  
Ofei Mante ◽  
Carine Arnaudguilhem ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
High Resolution Mass Spectrometry ◽  
Fast Pyrolysis ◽  
Gel Permeation Chromatography ◽  
Speciation Analysis ◽  
Transportation Fuels ◽  
Inductively Coupled ◽  
Animal Fats ◽  
Renewable Feedstocks ◽  
Pyrolysis Oils

Renewable feedstocks, such as lignocelulosic fast pyrolysis oils and both vegetable oil and animal fats, are becoming a viable alternative to petroleum for producing high-quality renewable transportation fuels.

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