Adsorption and desorption of eggplant peel anthocyanins on a synthetic layered silicate

Capello, Cristiane; Leandro, Gabriel Coelho; Campos, Carlos Eduardo Maduro de; Hotza, Dachamir; Carciofi, Bruno Augusto Mattar; Valencia, Germán Ayala

doi:10.1016/j.jfoodeng.2019.06.010

Cited by 43 publications

(23 citation statements)

References 44 publications

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“…In contrast, laponite clays do present good expansion properties upon intercalating tetracycline 35 or anthocyanins. 36 In accordance with this, our FL/SYnL-1 samples did show a slight increase in the d (001) values relative to the raw clay ( Table 1 and Figure S2b ), pointing to some intercalation between the layers of SYnL-1 in addition to adsorption on the external surface. Subtracting the 9.2 Å silicate layer thickness of laponite 22 , 23 from the range of basal spacings found for the FL/SYnL-1 samples (13.9–15.0 Å; Table 1 ) gives estimates of 4.7–5.8 Å for the interlayer expansion.…”

Section: Resultssupporting

confidence: 84%

Hybrid Pigments from Anthocyanin Analogues and Synthetic Clay Minerals

Silva

et al. 2020

ACS Omega

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Flavylium cations are synthetic analogues of anthocyanins, the natural plant pigments that are responsible for the majority of the red, blue, and purple colors of flowers, fruits, and leaves. Unlike anthocyanins, the properties and reactivity of flavylium cations can be manipulated by the nature and position of substituents on the flavylium cation chromophore. Currently, the most promising strategies for stabilizing the color of anthocyanins and flavylium cations appear to be to intercalate and/or adsorb them on solid surfaces and/or in confined spaces. We report here that hybrid pigments with improved thermal stability, fluorescence, and attractive colors are produced by the cation-exchange-mediated adsorption of flavylium cations (FL) on two synthetic clays, the mica-montmorillonite SYn-1, and the laponite SYnL-1. Compared to the FL/SYn-1 hybrid pigments, the FL/SYnL-1 pigments exhibited improved thermal stability as judged by color retention, better preferential adsorption of the cationic form of FL1 at neutral to mildly basic pH (pH 7–8), and lower susceptibility to color changes at pH 10. Although both clays adsorb the cationic form on their external surfaces, SYnL-1 gave more evidence of adsorption in the interlayer regions of the clay. This interlayer adsorption appears to be the contributing factor to the better properties of the FL/SYnL-1 hybrid pigments, pointing to this clay to be a promising inorganic matrix for the development of brightly colored, thermally more stable hybrid pigments based on cationic analogues of natural plant pigments.

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Section: Resultssupporting

confidence: 84%

Hybrid Pigments from Anthocyanin Analogues and Synthetic Clay Minerals

Silva

et al. 2020

ACS Omega

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“…At pH 7, the samples had gray color follow by light blue color at pH 10–12 as the consequence of the formation of quinoidal anhydrobase in ACN. [ 20,47 ] Visual color change of MCS‐ACN and MPS‐ACN suggests that the trapped ACN in the modified starches preserved its color change properties.…”

Section: Resultsmentioning

confidence: 99%

“…FTIR spectra of powders were obtained using a Fourier‐transform infrared spectrometer (FTIR, Cary 600, Agilent, US) in the infrared region between 4000 and 400 cm −1 using 4 cm −1 resolution with 32 scans and KBr pellets. [ 20 ]…”

Section: Methodsmentioning

confidence: 99%

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Physicochemical Properties of Modified Starches Obtained by Anti‐Solvent Precipitation Containing Anthocyanins from Jambolan (Syzygium cumini) Fruit

et al. 2021

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This study aims to develop and characterize modified starch particles containing anthocyanins (ACNs) from jambolan (Syzygium cumini) fruit, produced by an anti‐solvent precipitation method. Trapping efficiency, particle size distribution, surface charge, crystalline structure, chemical bonds, thermal properties, moisture content, water activity, color, and desorption experiments are carried out in modified cassava starch (MCS) and modified potato starch (MPS), both containing ACNs. Physicochemical properties of MCS and MPS both containing ACN (MCS‐ACN and MPS‐ACN) are compared using native cassava and potato starches, as well as modified cassava and potato starches without ACNs. ACNs are trapped into the modified starches and the trapping efficiency value oscillates between 9.89% and 12.37%. The resulting MCS‐ACN and MPS‐ACN‐ powders display bimodal distributions with particle size lower than 900 nm and amorphous structure. Furthermore, the MCS‐ACN and MPS‐ACN powders show red color typical of ACNs and they are completely soluble in water and acidified water solutions at room temperature. This research reports for the first‐time, information regarding the stabilization of ACNs using modified starch particles.

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“…The high resolution camera was configured in automatic mode, without zoom (55×) and flash. [ 15 ] The images were analyzed using the software ImageJ v1.39 (National Institute of Health, Bethesda, MD, USA) equipped with the Color Space Converter plugin. Color measurements were based on CIE Lab coordinates, namely, L * (lightness index), a * (color tonalities from red “+” to green “−”), and b * (color tonalities from yellow “+” to blue “−”).…”

Section: Methodsmentioning

confidence: 99%

Physicochemical Properties of Potato Starch Nanoparticles Produced by Anti‐Solvent Precipitation

et al. 2020

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This work aims to understand the physicochemical properties of potato starch nanoparticles (SNPs) obtained by anti‐solvent precipitation. Moisture content, water activity, color, morphology, thermal behavior (differential scanning calorimetry), swelling factor, solubility in water, water sorption isotherms, rheological properties, and stability in water are analyzed and compared using native potato starch (PS) as control. The resulting SNPs after anti‐solvent precipitation have a particle size between 50 and 150 nm, smaller than those observed in PS (between 10 and 100 µm). SNPs behave as an amorphous material without gelatinization stage where the swelling factor is drastically reduced, while the solubility increased dramatically at low temperatures when compared with PS. The Guggenheim–Anderson–de Boer model from the isotherms data allows a calculation of the surface area, obtaining values of 105 and 211 m2 g−1 for PS and SNPs, respectively. The high surface area in SNPs is associated with an increase in the proportion of hydroxyl groups active for water adsorption throughout its structure. Both samples show Newtonian fluid behavior; however, SNPs solutions prove to be much more stable at room temperature than PS solution.

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Adsorption and desorption of eggplant peel anthocyanins on a synthetic layered silicate

Cited by 43 publications

References 44 publications

Hybrid Pigments from Anthocyanin Analogues and Synthetic Clay Minerals

Hybrid Pigments from Anthocyanin Analogues and Synthetic Clay Minerals

Physicochemical Properties of Modified Starches Obtained by Anti‐Solvent Precipitation Containing Anthocyanins from Jambolan (Syzygium cumini) Fruit

Physicochemical Properties of Potato Starch Nanoparticles Produced by Anti‐Solvent Precipitation

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