Adsorption of lactate and citrate on montmorillonite in aqueous solutions

Ramos, M. Elena; Huertas, F. Javier

doi:10.1016/j.clay.2014.01.007

Cited by 29 publications

(6 citation statements)

References 55 publications

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“…This has already been observed in previous studies (Courdouan et al, 2007a(Courdouan et al, , 2007b) and seems to be due to a re-adsorption of organic compounds on clay minerals (Ramos and Huertas, 2014). On the contrary, acetate, formate, fumarate, lactate and propionate concentrations were not influenced by extraction time.…”

Section: Influence Of Extraction Timesupporting

confidence: 56%

Characterization of low-molecular-weight organic acids isolated from the Toarcian argillite pore water (Tournemire site, France)

Chautard

Ritt

Windt

et al. 2015

Comptes Rendus. Géoscience

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Section: Influence Of Extraction Timesupporting

confidence: 56%

Characterization of low-molecular-weight organic acids isolated from the Toarcian argillite pore water (Tournemire site, France)

Chautard

Ritt

Windt

et al. 2015

Comptes Rendus. Géoscience

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“…Although all the films had similar spectra, differences appeared mainly in two zones (Figure 6). Zone I was the weak bands at ~1500–1800 cm −1 , correlating with sodium citrate, ester group, including monoester and diester, formed by hydroxypropyl high amylomaize starch and citric acid, and carboxyl group [27,28].…”

Section: Resultsmentioning

confidence: 99%

“…The peak at 1732 cm −1 could be attributed to the esterification between citric acid and hydroxypropyl high amylomaize starch during reactive extrusion [1]. The band at ~1500–1600 cm −1 correlated with a carboxylate–metal ion interaction, including CA − , CA 2− , and CA 3− [27]. When pH decreased from 8.68 to 4.83, the intensity of the peak at 1560 cm −1 had a significantly decreased that could be suspected as the citric acid molecular changed from fully deprotonated to doubly protonated.…”

Section: Resultsmentioning

confidence: 99%

Effects of Citric Acid on Structures and Properties of Thermoplastic Hydroxypropyl Amylomaize Starch Films

et al. 2019

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Hydroxypropyl amylomaize starch (HPAS) films were prepared by hot press. The effects of initial pH of HPAS on the mechanical properties, molecular interaction, structure, and cross-linking degree of the resultant films were investigated. A weak acidic condition was suitable for cross-linking of citric acid and HPAS by reactive extrusion. The film of HPAS with an initial pH of 5.66 had the maximum tensile strength of 7.20 MPa and elongation-at-break of 94.53%, and the weight average molecular weight of HPAS increased to 4.17 × 105 g/mol. An appropriate initial pH facilitated the formation of diester bonds between HPAS and citric acid during extrusion, but too low initial pH levels resulted in hydrolysis of starch molecules and reduced the mechanical properties.

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“…This behavior can be related to the results from mechanical testing, indicating that CCit interacted more strongly with MMT than with the starch. According to the literature, carboxylic acids are able to adsorb on the clay surface , but investigations of crosslinking reactions of citric acid in starch‐based films in the presence of clay have been poorly described, at least via IR techniques. The hindering activity of montmorillonite has been reported , where increasing addition of MMT led to slightly decreased grafting percentage of acrylic acid on maize starch, but this correlation was based on a titration method.…”

Section: Resultsmentioning

confidence: 99%

Impact of additives on mechanical and barrier properties of starch‐based films plasticized with deep eutectic solvents

Zdanowicz

Johansson²

2017

Starch Stärke

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The aim of this work was to prepare starch‐based films plasticized with two and three‐component deep eutectic solvents (DES) in the presence of different additives: aluminosilicates (sodium and calcium montmorillonite), microcrystalline cellulose, and tannin; and to investigate their influence on mechanical and barrier properties of the films. Mutual interactions between polysaccharide matrix, plasticizer, and additive were investigated by Fourier transform infrared (FTIR) spectroscopy. Two types of starches were used: native potato starch (TPS) and hydroxypropylated, oxidized potato starch (HOPS). The two‐component DES CC:G consisted of choline chloride (CC) and glycerol (G), whereas the three‐component DES with crosslinking activity CCit:U:G, included choline citrate (CCit), urea (U), and glycerol. For the TPS/CCit:U:G films an improvement of the mechanical and barrier properties was obtained after introduction of additives, whereas for TPS/CC:G only a slight decrease in water vapor transmission rate was observed, without any significant improvement in mechanical properties. Moreover, the mechanical test results, FTIR spectra, and the oxygen transmission rate values revealed that the clays interacted with plasticizer components, thereby hindering crosslinking reactions between plasticizer and starch.

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Adsorption of lactate and citrate on montmorillonite in aqueous solutions

Cited by 29 publications

References 55 publications

Characterization of low-molecular-weight organic acids isolated from the Toarcian argillite pore water (Tournemire site, France)

Characterization of low-molecular-weight organic acids isolated from the Toarcian argillite pore water (Tournemire site, France)

Effects of Citric Acid on Structures and Properties of Thermoplastic Hydroxypropyl Amylomaize Starch Films

Impact of additives on mechanical and barrier properties of starch‐based films plasticized with deep eutectic solvents

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