Adsorption of dark compounds with bentonites in apple juice

Koyuncu, Hülya; Kul, Ali Rıza; Çalımlı, Ayla; Yıldız, Nuray; Ceylan, Hasan

doi:10.1016/j.lwt.2005.12.005

Cited by 22 publications

(21 citation statements)

References 28 publications

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“…T ( • C) K0 (m 3 /mol) G (kJ/mol) H (kJ/mol) a S (J/(mol K)) a and the thermodynamic parameters of H and S can be described by Van't Hoff correlation in the following equation [47,48]:…”

Section: Effect Of Temperature and Adsorption Thermodynamicsmentioning

confidence: 99%

A modified lignin adsorbent for the removal of 2,4,6-trinitrotoluene

Zhang

Lin

Luo

et al. 2011

Chemical Engineering Journal

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“…T ( • C) K0 (m 3 /mol) G (kJ/mol) H (kJ/mol) a S (J/(mol K)) a and the thermodynamic parameters of H and S can be described by Van't Hoff correlation in the following equation [47,48]:…”

Section: Effect Of Temperature and Adsorption Thermodynamicsmentioning

confidence: 99%

A modified lignin adsorbent for the removal of 2,4,6-trinitrotoluene

Zhang

Lin

Luo

et al. 2011

Chemical Engineering Journal

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“…Reducing the economic loss associated with spoilage, lowering food processing costs, and preventing foodborne pathogen transmission are critical challenges faced by the food industry. Worldwide, apples are the most extensively grown and consumed fruit (Koyuncu et al 2007). Continuous market availability throughout the year in a variety of forms, such as fresh fruit, juice, cider, and mashed apples, explains the importance of apples and their reputation as a healthy food (Vafa et al 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Apple juice from fresh fruit is chemically and microbiologically unstable, so that its composition might change during processing and storage (Koyuncu et al 2007). Consequently, the susceptibility of fresh apple juice to microbial spoilage and enzymatic gas production that reduce shelf life while increasing off-flavor and turbidity dictates application of preservative treatment (Suárez-Jacobo et al 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Several treatments are now available to prevent browning and haze formation associated with phenolic compounds and to optimize the flavor of apple juices. Conventional clarification agents such as gelatin, bentonite, activated carbon, and silica gel are used commonly by the food industry for beverage stabilization (Koyuncu et al 2007). Various forms of silica are used widely as adsorbents and haze control agents in fruit juice and alcoholic beverages.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of Lactobacillus brevis NS01 Brevicin Production and Its Application in Apple Juice Biopreservation Using Food-Grade Clarifying Agent Silica as a Carrier

Duraisamy¹,

Murugan

Balakrishnan

et al. 2015

Food Bioprocess Technol

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Bacteriocins are nowadays recognized as good biopreservatives that are able to contain microbial contaminant development in several food products. In this study, the goat milk isolate Lactobacillus brevis NS01 brevicin activity on common foodborne pathogenic organisms and its characterization, stability, and statistical response surface methodology (RSM) optimization of media components for enhanced production were determined. Its adsorption onto common stabilizing agent silica and applicability in apple juice preservation were also determined. The L. brevis NS01 produced 3.2 kDa common foodborne pathogen inhibitory brevicin having more polar (68.6 %) than non-polar (30.8 %) amino acids. Optimization of growth conditions by RSM demonstrated that glucose, sodium acetate, and triammonium sulfate concentration of 33.41, 8.36, and 2.22 g/L, respectively, increased its production. Brevicin activity was constant over a broad range of pH (3-8) and temperature (20-100°C) and reached a maximum at pH 6 and 40°C. Maximum adsorption of brevicin onto silica took place at pH 6-7, 40°C for 240 min. The carrier silica exhibited significant Fourier transform infrared (FTIR) spectral changes upon brevicin adsorption and presented good biopreservative activity. This study demonstrates the potential large-scale use of brevicin adsorbed silica for shelf life increase and clarification at a same time.

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“…[1][2][3][4] The potentiality of the organosilane compounds in the chemical organofunctionalizing process has been widely explored for many inorganic polymeric natural or synthetic surfaces, such as those recently described for layered natural smectite silicates. 1,6 Thus, the synthetic organoclay products have been successfully applied as electrode for electrochemical use as biosensors, 7 support for enzyme immobilizations, 8 in hybrid compounds, 9 antifugal compounds 10 and in polymeric nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Mercury adsorption on natural and organofunctionalized smectites - thermodynamics of cation removal

Guerra¹,

Santos²,

Airoldi³

2009

J. Braz. Chem. Soc.

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Uma amostra natural de esmectita oriunda do estado do Piauí, Brasil, foi organofuncionalizada com 3-mercaptopropiltrimethoxissilano e 3-aminopropiltriethoxissilano. O espaçamento basal da argila natural é de 0,99 nm e área superficial 48 m 2 g -1. Houve um aumento no espaçamento basal para 1,84 e 2,01 nm e o aumento da área específica para 781 e 795 m 2 g -1 para as argilas quimicamente modificadas, respectivamente. A argila natural e a argila quimicamente modificada adsorveram cátions mercúrio em solução aquosa em pH 3,0 e 298 ± 1 K. Os modelos de isotermas de adsorção de Langmuir, Redlich-Peterson e Toth foram aplicados para ajuste dos dados experimentais com aproximação não linear. Para as interações cátion/centros básicos para cada esmectita na interface sólido/líquido foi utilizada metodologia calorimétrica e foram obtidas as constantes de equilíbrio e os efeitos térmicos exotérmicos. Considerando o número interativo de moles para cada cátion e as constantes de equilíbrio, a entalpia, ∆ int H o (−11,98 a −13,93 kJ mol ). As interações cátion/ centros básicos são de natureza espontânea como demonstram os valores de energia livre de Gibbs, dando o conjunto de dados favoráveis como expressam a entalpia exotérmica e a entropia positiva, mostrando que a esmectita natural e as quimicamente modificadas têm habilidade em complexar mercúrio. Logo, esses materiais são úteis na remoção de mercúrio em um ecossistema.A natural smectite clay sample from Piauí State, Brazil, was organofunctionalized with 3-mercaptopropyltrimethoxysilane and 3-aminopropyltriethoxysilane silyating agents. The basal spacing of 0.99 nm and surface area of 48 m 2 g -1 for natural clay increased to 1.84 and 2.01 nm, and 781 and 795 m 2 g -1 for modified clays, respectively. The natural and chemically immobilized clay samples adsorb mercury cations from aqueous solutions at pH 3.0 at 298 ± 1 K. The Langmuir, Redlich-Peterson and Toth adsorption isotherm models were applied to fit the experimental data with a nonlinear approach. From the cation/basic center interactions for each smectite at the solid-liquid interface, by using calorimetry methodology, the equilibrium constant and exothermic thermal effects were obtained. By considering the net interactive number of moles for each cation and the equilibrium constant, the enthalpy, ∆ int H o (−11.98 to −13.93 kJ mol ). The cation-basic center interactions are spontaneous in nature as demonstrated from favorable enthalpic and entropic results. Natural and anchored smectites have the ability to complex mercury, acting as useful materials for removal of this hazardous metal from an ecosystem.

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Adsorption of dark compounds with bentonites in apple juice

Cited by 22 publications

References 28 publications

A modified lignin adsorbent for the removal of 2,4,6-trinitrotoluene

A modified lignin adsorbent for the removal of 2,4,6-trinitrotoluene

Optimization of Lactobacillus brevis NS01 Brevicin Production and Its Application in Apple Juice Biopreservation Using Food-Grade Clarifying Agent Silica as a Carrier

Mercury adsorption on natural and organofunctionalized smectites - thermodynamics of cation removal

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