| Title |
Characterization of oxidized tannins: comparison of depolymerization methods, asymmetric flow field-flow fractionation and small-angle X-ray scattering
|
|---|---|
| Published in |
Analytical & Bioanalytical Chemistry, May 2011
|
| DOI | 10.1007/s00216-011-5076-2 |
| Pubmed ID | |
| Authors |
Aude Vernhet, Stéphane Dubascoux, Bernard Cabane, Hélène Fulcrand, Eric Dubreucq, Céline Poncet-Legrand |
| Abstract |
Condensed tannins are a major class of plant polyphenols. They play an important part in the colour and taste of foods and beverages. Due to their chemical reactivity, tannins are not stable once extracted from plants. A number of chemical reactions can take place, leading to structural changes of the native structures to give so-called derived tannins and pigments. This paper compares results obtained on native and oxidized tannins with different techniques: depolymerization followed by high-performance liquid chromatography analysis, small-angle X-ray scattering (SAXS) and asymmetric flow field-flow fractionation (AF4). Upon oxidation, new macromolecules were formed. Thioglycolysis experiments showed no evidence of molecular weight increase, but thioglycolysis yields drastically decreased. When oxidation was performed at high concentration (e.g., 10 g L(-1)), the weight average degree of polymerization determined from SAXS increased, whereas it remained stable when oxidation was done at low concentration (0.1 g L(-1)), indicating that the reaction was intramolecular, yet the conformations were different. Differences in terms of solubility were observed; ethanol being a better solvent than water. We also separated soluble and non-water-soluble species of a much oxidized fraction. Thioglycolysis showed no big differences between the two fractions, whereas SAXS and AF4 showed that insoluble macromolecules have a weight average molecular weight ten times higher than the soluble ones. |
Mendeley readers
The data shown below were compiled from readership statistics for 80 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Brazil | 2 | 3% |
| Australia | 1 | 1% |
| United States | 1 | 1% |
| Unknown | 76 | 95% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Ph. D. Student | 24 | 30% |
| Student > Doctoral Student | 12 | 15% |
| Researcher | 10 | 13% |
| Student > Master | 7 | 9% |
| Student > Bachelor | 3 | 4% |
| Other | 11 | 14% |
| Unknown | 13 | 16% |
| Readers by discipline | Count | As % |
|---|---|---|
| Chemistry | 30 | 38% |
| Agricultural and Biological Sciences | 21 | 26% |
| Engineering | 2 | 3% |
| Materials Science | 2 | 3% |
| Biochemistry, Genetics and Molecular Biology | 1 | 1% |
| Other | 4 | 5% |
| Unknown | 20 | 25% |
Attention Score in Context
This research output has an Altmetric Attention Score of 3. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 15 September 2023.
All research outputs
#8,572,103
of 25,460,914 outputs
Outputs from Analytical & Bioanalytical Chemistry
#2,218
of 9,646 outputs
Outputs of similar age
#45,772
of 122,234 outputs
Outputs of similar age from Analytical & Bioanalytical Chemistry
#28
of 90 outputs
Altmetric has tracked 25,460,914 research outputs across all sources so far. This one is in the 43rd percentile – i.e., 43% of other outputs scored the same or lower than it.
So far Altmetric has tracked 9,646 research outputs from this source. They receive a mean Attention Score of 3.1. This one has gotten more attention than average, scoring higher than 55% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 122,234 tracked outputs that were published within six weeks on either side of this one in any source. This one is in the 29th percentile – i.e., 29% of its contemporaries scored the same or lower than it.
We're also able to compare this research output to 90 others from the same source and published within six weeks on either side of this one. This one is in the 23rd percentile – i.e., 23% of its contemporaries scored the same or lower than it.