Adsorption of Tea Polyphenols using Microporous Starch: A Study of Kinetics, Equilibrium and Thermodynamics

Hu, Xianchun; Du, Xiang

doi:10.3390/molecules24081449

Cited by 18 publications

(9 citation statements)

References 47 publications

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“…In addition, the curve of the first stage fitted by the intra-particle diffusion model does not pass through the origin. This indicates that the adsorption process is complex and is controlled by several rate-limiting steps [ 44 ]. In other words, the adsorption rate is controlled by intra-particle diffusion, but there are other rate-limiting steps.…”

Section: Resultsmentioning

confidence: 99%

Sorption of Sulfamethoxazole on Inorganic Acid Solution-Etched Biochar Derived from Alfalfa

Guo³

et al. 2021

Materials

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The properties of alfalfa-derived biochars etched with phosphoric (PBC) or hydrochloric acid (ClBC) compared with raw materials (BC) were examine in this paper. SEM, FT-IR, XRD, BET and elemental analysis were performed to characterize the micromorphology and chemical structure comprehensibly. The results showed that the porous structure was enhanced, and surface area was increased via etching with inorganic acids. Batch adsorption experiments were performed for sulfamethoxazole (SMX) to biochars. The experimental data showed that modified biochars exhibited higher adsorption capacity for SMX, i.e., the adsorption quantity of ClBC and PBC had risen by 38% and 46%. The impact on pH values suggested that the physisorption, including pore-filling and electrostatic interaction, might be applied to original biochar. In addition, chemisorption also played a role, including hydrogen bonding, π-π electron donor acceptor interaction (π-π EDA), and so on. Furthermore, both pH and coexisting ions also had a certain effect on sorption. Enhancement of the electrostatic attraction between biochar and SMX might also account for the enhanced capacity of SMX at pH＜7, and coexisting ions could decrease the amount of SMX adsorbed onto biochars, mainly because of competition for adsorption sites.

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Section: Resultsmentioning

confidence: 99%

Sorption of Sulfamethoxazole on Inorganic Acid Solution-Etched Biochar Derived from Alfalfa

Guo³

et al. 2021

Materials

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“…Particularly, CGL's high peak intensity indicated the increasing retention by entrapment of polyphenols by CS, even after gelatinization treatment [35]. NT and GL samples, according to the literature [19,29,33], interact between AF and CS based on physical bonds. Physisorption has a relatively low degree of specificity and is therefore regarded as non-specific [10,36].…”

Section: Fourier Transform Infrared Spectrophotometry (Ft-ir)mentioning

confidence: 91%

“…The FT-IR technique was carried out to evaluate the nature of bindings formed between CS and polyphenols by means of the analysis of AF, CS, and AF-CS blends (1:1 ratio) from NT, GL, and CGL methods. FT-IR can provide relevant structural information and was previously employed in polyphenols-starch systems [10,33].…”

Section: Fourier Transform Infrared Spectrophotometry (Ft-ir)mentioning

confidence: 99%

Interactions between Ascophyllum nodosum Seaweeds Polyphenols and Native and Gelled Corn Starches

Gisbert

Aleixandre

Sineiro

et al. 2022

Foods

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The effect of several blending procedures between Ascophyllum nodosum seaweed flour (AF) and corn starch (CS) on the interactions between polyphenols and starch was studied in this paper. These methods comprised the blending of AF with native starch (NT) with previously gelled starch gel (GL) and promoting the gelling of corn starch in the presence of AF (CGL). Different AF–CS (g/g) ratios (from 1:0.5 to 1:25) were studied. The liquid phase was chemically characterized by polyphenols (TPC) and carbohydrates content. The antioxidant activity of the liquid phase after achieving the solid–liquid equilibrium was determined by DPPH, ABTS, and FRAP methods. The solid phase was characterized by FT-IR and SEM techniques. The Halsey model successfully fitted the equilibrium TPC in liquid and polyphenols adsorbed/retained by the solid phase of tested systems. NT samples showed lower polyphenols sorption than gelled samples. The differences found between samples obtained with GL and CGL methods suggested different interactions between polyphenols and starch. Specifically, physisorption is predominant in the case of the GL method, and molecular trapping of polyphenols in the starch gel structure is relevant for the CGL method. Results allowed us to determine the enhancement of the retention of polyphenols to achieve starchy foods with high bioactivity.

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“…The analysis of the thermodynamic parameters of adsorption enabled us to understand the thermodynamic behavior of resin and the internal energy change after adsorption [ 43 , 44 ]. There are three main parameters: enthalpy change ΔH (KJ·mol −1 ), free energy change ΔG (KJ·mol −1 ·K −1 ), and entropy change ΔS (KJ·mol −1 ).…”

Section: Methodsmentioning

confidence: 99%

Adsorption and Desorption Characteristics of Total Flavonoids from Acanthopanax senticosus on Macroporous Adsorption Resins

Wang

Chu

et al. 2021

Molecules

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We examined the application of six different resins with the aim of selecting a macroporous resin suitable for purifying Acanthopanax senticosus total flavonoids (ASTFs) from Acanthopanax senticosus crude extract (EAS) by comparing their adsorption/desorption capacities, which led to the selection of HPD-600. Research on the adsorption mechanism showed that the adsorption process had pseudo-second-order kinetics and fit the Freundlich adsorption model. Moreover, the analysis of thermodynamic parameters indicated that the adsorption process is spontaneous and endothermic. The optimal conditions for purification of ASTFs were determined as sample pH of 3, 60% ethanol concentration, and 3 BV·h−1 flow rate, for both adsorption and desorption, using volumes of 2.5 and 4 BV, respectively. The application of macroporous resin HPD-600 to enrich ASTFs resulted in an increase in the purity of total flavonoids, from 28.79% to 50.57%. Additionally, the antioxidant capacity of ASTFs was higher than that of EAS, but both were lower than that of L-ascorbic acid. The changes in ASTFs compositions were determined using ultra-performance liquid chromatography–tandem mass spectrometry (UHPLC–MS/MS), with the results illustrating that the levels of seven major flavonoids of ASTFs were increased compared to that in the crude extract.

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Adsorption of Tea Polyphenols using Microporous Starch: A Study of Kinetics, Equilibrium and Thermodynamics

Cited by 18 publications

References 47 publications

Sorption of Sulfamethoxazole on Inorganic Acid Solution-Etched Biochar Derived from Alfalfa

Sorption of Sulfamethoxazole on Inorganic Acid Solution-Etched Biochar Derived from Alfalfa

Interactions between Ascophyllum nodosum Seaweeds Polyphenols and Native and Gelled Corn Starches

Adsorption and Desorption Characteristics of Total Flavonoids from Acanthopanax senticosus on Macroporous Adsorption Resins

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