Ultrafine fibers of zein and anthocyanins as natural pH indicator

Prietto, Luciana; Pinto, Vânia Zanella; Halal, Shanise Lisie Mello El; Morais, Michele Greque de; Costa, Jorge Alberto Vieira; Lim, Loong‐Tak; Dias, Álvaro Renato Guerra; Zavareze, Elessandra da Rosa

doi:10.1002/jsfa.8769

Cited by 89 publications

(48 citation statements)

References 25 publications

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“…Electrical conductivity was determined from the methodology described by Prietto et al. (). Electrical conductivity was determined for all zein solutions at different concentrations of GA (1 to 5% w/v).…”

Section: Methodsmentioning

confidence: 99%

Gallic Acid‐Loaded Zein Nanoparticles by Electrospraying Process

Tapia-Hernández

Del‐Toro‐Sánchez

Cinco-Moroyoqui

et al. 2019

Journal of Food Science

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Currently, electrospraying is a novel process for obtaining the nanoparticles from biopolymers. Zein nanoparticles have been obtained by this method and used to protect both hydrophilic and hydrophobic antioxidant molecules from environmental factors. The objective of this work was to prepare and characterize gallic acid‐loaded zein nanoparticles obtained by the electrospraying process to provide protection to gallic acid from environmental factors. Thus, it was related to the concentration of gallic acid in physicochemical and rheological properties of the electrosprayed solution, and also to equipment parameters, such as voltage, flow rate, and distance of the collector in morphology, and particle size. The physicochemical properties showed a relationship in the formation of a Taylor cone, in which at a low concentration of gallic acid (1% w/v), low viscosity (0.00464 ± 0.00001 Pa·s), and density (0.886 ± 0.00002 g/cm3), as well as high electrical conductivity (369 ± 4.3 µs/cm), forms a stable cone‐jet mode. The rheological properties and the Power Law model of the gallic acid‐zein electrosprayed solution demonstrated Newtonian behavior (n = 1). The morphology and size of the particle were dependent on the concentration of gallic acid. Electrosprayed parameters with high voltage (15 kV), low flow rate (0.1 mL/hr), and short distance (10 cm) exhibited a smaller diameter and spherical morphology. FT–IR showed interaction in the gallic acid‐loaded zein nanoparticle by hydrogen bonds. Therefore, the electrospraying process is a feasible technique for obtaining gallic acid‐loaded zein nanoparticles and providing potential protection to gallic acid from environmental factors.

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Section: Methodsmentioning

confidence: 99%

Gallic Acid‐Loaded Zein Nanoparticles by Electrospraying Process

Tapia-Hernández

Del‐Toro‐Sánchez

Cinco-Moroyoqui

et al. 2019

Journal of Food Science

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“…Previous study showed that the extraction of anthocyanin from blackberry also gave the similar trend, where the addition of hydrochloric acid in ethanol showed a better result than 100% ethanol solvent [14]. In addition, another study presented that there was an apparent difference in the color of films containing anthocyanins and the film at pH 1-3 had a better reddish color [31]. Furthermore, acids were required in stabilizing anthocyanin in the form of flavylium cation.…”

Section: Effect Of Temperature and Ph On The Extraction Characteristicsmentioning

confidence: 81%

Kinetics of Ultrasound-Assisted Extraction of Anthocyanin from Purple Roselle Calyces under different pH Conditions

Aryanti¹,

Nafiunisa²,

Bella³

et al. 2018

ChChT

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1 This research presents that the higher temperature results on higher extracted anthocyanin. In addition, it was found that pH 2 was preferable for obtaining greater anthocyanin content. Employing the second order kinetics model in this research confirmed the good fitting of the model and experimental data.Анотація. Експериментально доведено, що антоціан краще екстрагується за вищих температур. Встановлено, що найбільший вміст антоціану досягається за рівня рН = 2. Застосовано модель кінетики другого порядку, яка добре узгоджується з експериментальними даними.Ключові слова: розелла, антоціан, екстракція, ультразвук, кінетика.

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“…Color parameters were also measured via color code picker to determine the (Red, Green, Blue) RGB value. RGB color generates a simulation of a different color depending on the primary colors and the specific configuration of brightness, contrast, and gamma.CIE2000 was used to calculate the parameters of L* (lightness), a* (redness to greenness) and b* (yellowness to blueness) and total color difference, ΔE value using Equation ) 25

Δ E = \sqrt[2]{{Δ L}^{* 2} + Δ a^{* 2} + {Δ b}^{* 2}} .

…”

Section: Methodsmentioning

confidence: 99%

Halochromic poly (lactic acid) film for acid base sensor

Yam

Rusli

Hamid

et al. 2020

J of Applied Polymer Sci

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A novel strategy to engineer biodegradable halochromic film based on poly (lactic acid) (PLA) for pH sensorial substances was presented. The effect of polyethylene glycol (PEG) compositions and dye amount on the efficiency of halochromic pH film was observed. The interactions between PLA, PEG, and dye was evidence by Fourier transform infrared. UV-VIS results indicated the sensitivity of the halochromic film through color changes. Mechanical performance was investigated by tensile testing to assess the potential of the halochromic film. It was found that the halochromic pH film has a clear color response from yellow to purple at pH 3-11 with a rapid response time within a minute. The results also revealed that varying content of PEG showed a significant effect on response time compared with varying dye compositions. PLA/PEG film and dye formed new interactions where PEG increased the free volume of PLA and made it possible for the PEG and the dye to diffuse and entrap between PLA chain. In term of the film strength, the addition of PEG and dye improved the flexibility of PLA film, which enables great potential in many applications such as medical, textile, and packaging.

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Ultrafine fibers of zein and anthocyanins as natural pH indicator

Abstract: The pH membranes exhibited color changes in a board pH range, which can potentially be used in various active packaging applications. © 2017 Society of Chemical Industry.

Cited by 89 publications

References 25 publications

Gallic Acid‐Loaded Zein Nanoparticles by Electrospraying Process

Gallic Acid‐Loaded Zein Nanoparticles by Electrospraying Process

Kinetics of Ultrasound-Assisted Extraction of Anthocyanin from Purple Roselle Calyces under different pH Conditions

Halochromic poly (lactic acid) film for acid base sensor

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