 IVES 9 IVES Conference Series 9 Adsorption capacity of phenolics compounds by polyaniline materials in model solution

Adsorption capacity of phenolics compounds by polyaniline materials in model solution

Abstract

AIM: The aim of this work was to study the trapping capacity of four polyaniline polymers towards phenolic compounds in wine-like model solutions.

METHODS: The model wine solution was composed of 12% (v/v) and 4 g/L of tartaric acid adjusted to pH = 3.6. A series of centrifuge tubes (15 mL) were filled with 10 mL of model solution enriched with 50 mg/L of five phenolic compounds (i.e., Gallic acid, caffeic acid, (+)-catechin, (-)-epicatechin, and rutin), and treated with different doses of PANI polymer (i.e., 0, 2, 4 and 8 g/L). After the addition of the polymer, the samples were stirred using a platform shaker at room temperature (20 ºC) for 2, 8, 16 and 24 h. All treatments included three replications. The synthesis and characterization of polyaniline emeraldine base (PANI-EB) and different PANI 50, 100, 150 (polyaniline-PVPP composites where 50, 100, 150 are amount of PVPP) was prepared according to what was reported by Marican et al. (2014). Once the selected contact times were over, the samples were filtered and were by HPLC-DAD, following the methodology described by Gómez-Alonso et al. (2007). In brief, the separation was performed using a reverse-phased LiChrosorb® RP-18 (5 μm) column (250 mm × 4 mm ID) operating at 20 ºC. The injection volume was 25 μL, and for detection and quantification of compounds, the chromatograms were recorded at 280, 320 and 360 nm.

RESULTS: Regardless of the polymer used, the compounds having more affinity for PANI were gallic and caffeic acid, whereas rutin and (+)-catechin were the least removed. For instance, the adsorption percentage of gallic and caffeic acid, with a 4 g/L PANI concentration and 8 h of contact time, reached more than 90% whereas the removal of rutin was lower than 40%. Instead, the phenolic concertation of the samples where no polymer was added (0 g/L of PANI) remain stable over time, very close to 50 mg /L for each of the phenols evaluated. As expected, the concentration of the five phenols decreased as the contact time increased. As an example, a 2 g/L addition of PANI 50 produced a reduction of (-)-epicatechin concentration of 17 mg/L after 8 h of contact time and 25 mg/L after 24 h. Like so, the decrease in the concentration of all phenols was greater when more polymer was added.

CONCLUSIONS: The results obtained suggest that PANI Polymers could be an interesting alternative for analytical or experimental applications in which polyphenolcs need to be removed.

DOI:

Publication date: September 28, 2021

Issue: Macrowine 2021

Type: Article

Authors

María Navarro, JOHN AMALRAJ, V. FELIPE LAURIE

Talca University

Contact the author

Keywords

pani polymers, phenols, model wine solutions

Citation

Delaying irrigation initiation linearly reduces yield with little impact on maturity in Pinot noir

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Inhibition of Oenococcus oeni during alcoholic fermentation by a selected Lactiplantibacillus plantarum strain

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Rootstock regulation of scion phenotypes: the relationship between rootstock parentage and petiole mineral concentration

Grapevine is grown as a graft since the end of the 19th century. Rootstocks not only provide tolerance to Phylloxera but also ensure the supply of water and mineral nutrients to the scion. Rootstocks are an important mean of adaptation to environmental conditions, because the scion controls the typical features of the grapes and wine. However, among the large diversity of rootstocks worldwide, few of them are commercially used in the vineyard. The aim of this study was to investigate the extent to which rootstocks modify the mineral composition of the petioles of the scion. Vitis vinifera cvs. Cabernet-Sauvignon, Pinot noir, Syrah and Ugni blanc were grafted onto 55 different rootstock genotypes and planted in a vineyard as three replicates of 5 vines. Petioles were collected in the cluster zone with 6 replicates per combination. Petiolar concentrations of 13 mineral elements (N, P, K, S, Mg, Ca, Na, B, Zn, Mn, Fe, Cu, Al) at veraison were determined. Scion, rootstock and the interaction explained the same proportion of the phenotypic variance for most mineral elements. Rootstock genotype showed a significant influence on the petiole mineral element composition. Rootstock effect explained from 7 % for Cu to 25 % for S of the variance. The difference of rootstock conferred mineral status is discussed in relation to vigor and fertility. Rootstocks were also genotyped with 23 microsatellite markers. Data were analysed according to genetic groups in order to determine whether the petiole mineral composition could be related to the genetic parentage of the rootstock. Thanks to a highly powerful design, it is the first time that such a large panel of rootstocks grafted with 4 scions has been studied. These results give the opportunity to better characterize the rootstocks and to enlarge the diversity used in the vineyard.