Physico-chemical and gel properties of agar from Gracilaria tenuistipitata from the lake of Songkhla, Thailand

Yarnpakdee, Suthasinee; Benjakul, Soottawat; Kingwascharapong, Passakorn

doi:10.1016/j.foodhyd.2015.05.004

Cited by 114 publications

(96 citation statements)

References 38 publications

(9 reference statements)

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“…7 shows the schematic of agar gel structure. While agar gel is usually porous with lots of pores in it (Tiwari et al, 2015;Yarnpakdee et al, 2015), it is low permeable because the functional groups in the polymer chains carry abundant bound water, and the bound water can occupy the pores. Different from free water, filtering the bound water in gel need provide an extra force.…”

Section: Verification Of the Proposed Mechanismmentioning

confidence: 99%

“…In other side, the gel layer formed in MBRs is generally thin and porous Waite, 2008a, 2008b;Hong et al, 2014). For model gel layers, Yarnpakdee et al (2015) observed that Gracilaria agar gel had coarse network with the large voids. Xin et al (2015) found that Ca-alginate gel layer displays a distinct "honeycomb" structure with high porosity.…”

Section: Introductionmentioning

confidence: 97%

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Membrane fouling in a membrane bioreactor: High filtration resistance of gel layer and its underlying mechanism

et al. 2016

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Section: Verification Of the Proposed Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Membrane fouling in a membrane bioreactor: High filtration resistance of gel layer and its underlying mechanism

et al. 2016

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“…The body of red algae contains large amounts of mucilaginous materials such as agar or carrageenan. The exploitation of red algae, especially Gelidium sesquipedale, for the production of agar products has become an important industry in recent years [16]. It generates a large quantity of solid fibrous wastes which cause serious environmental problems [17].…”

Section: Introductionmentioning

confidence: 99%

Reuse of red algae waste for the production of cellulose nanocrystals and its application in polymer nanocomposites

Achaby

Kassab

Aboulkas

et al. 2018

International Journal of Biological Macromolecules

166

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phone (+2126) 620 10 620 Highlights  Cellulose nanocrystals (CNC) were successfully extracted from red algae waste  CNC exhibit a needle-like shape and a diameter of 5-9 nm, and a length of 289-315 nm  PVA nanocomposite films with different CNC contents were prepared by solvent-casting  Nanocomposites with high mechanical performance and good transparency were obtaine Version postprintComment citer ce document : El Achaby, M., Kassab, Z., Aboulkas, A., Gaillard, C., AbstractRed algae is widely available around the world and its exploitation for the production of agar products has become an important industry in recent years. The industrial processing of red algae generates a large quantity of solid fibrous wastes, which constitutes a source of serious environmental problems. In the present work, the utilization of red algae waste as raw material to produce high-quality cellulose nanocrystals (CNC) has been investigated, and the ability of the as-isolated CNC to reinforce polymer has been studied. Red algae waste was chemically treated via alkali, bleaching and acid hydrolysis treatments, in order to obtain pure cellulose microfibers and CNC. The raw waste and the as-extracted cellulosic materials were successively characterized at different stages of treatments using serval analysis techniques. It was found that needle-like shaped CNC were successfully isolated at nanometric scale with diameters and lengths ranged from 5.2 ± 2.9 to 9.1 ± 3.1 nm, and from 285.4 ± 36.5 to 315.7 ± 30.3 nm, respectively, and the crystallinity index ranged from 81 to 87 %, depending on the hydrolysis time (30, 40 and 80 minutes). The as-extracted CNC were used as nanofillers for the production of polyvinyl alcohol (PVA)-based nanocomposite films with improved thermal and tensile properties, as well as optical transparency. It is shown that the addition of 8 wt % CNC into the PVA matrix increased the Young's modulus by 215 %, the tensile strength by 150 %, and the toughness by 45 %. Additionally, the nanocomposite films maintained the same transparency level of the neat PVA film (transmittance of ∼90% in the visible region), suggesting that the CNC were dispersed at the nanoscale.

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“…The ATR-FTIR spectra of lac dye and G. tenuistipitata dried biomass (algae) before and after dye biosorption are shown in Gracilaria species are known to produce agar with relatively high sulfate content [26,46,47].…”

Section: Atr-ftir Spectroscopic Analysismentioning

confidence: 99%

Biosorption of lac dye by the red marine alga Gracilaria tenuistipitata: biosorption kinetics, isotherms, and thermodynamic parameters

Chairat

Bremner

2016

Coloration Technology

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The hypothesis that the dried, ground biomass of the red marine alga Gracilaria tenuistipitata could be used for the efficient removal of lac dye from aqueous solution was assessed in this work. The effects of parameters such as initial pH, biosorbent dosage, contact time, initial dye concentration, and temperature on the biosorption capacity of the dye were investigated. Equilibrium data were analysed using Langmuir, Freundlich, and Temkin isotherm models, and the Freundlich model provided the highest coefficient of determination values. Biosorption kinetic data were successfully described with a pseudo-second-order model at initial dye concentrations of 50, 80, 100, and 120 mg l −1 . The thermodynamic parameters of biosorptionenthalpy change (∆H° = −30.64 kJ mol −1 ), free energy change (∆G° = 4.32 kJ mol −1 at 303 K to 7.78 kJ mol −1 at 333 K), and entropy change (∆S° = −115.38 J mol −1 K −1 ) -were determined. The negative value of the enthalpy change and positive values of the free energy change indicate that the biosorption process is exothermic and non-spontaneous. The negative value of the entropy change is consistent with decreased randomness at the solid-liquid interface with dye biosorption. Attenuated total reflectance-Fourier transform infrared spectroscopic analysis confirmed the presence of lac dye on the G. tenuistipitata material. The efficiency of lac dye removal by this biomass material at 20 g l −1 and with an initial dye concentration of 50 mg l −1 in acidic solution was 71%, which indicated its potential usefulness as a new dye biosorbent. Running title: Removal of lac dye by Gracilaria tenuistipitata AbstractThe hypothesis that the dried, ground biomass of the red marine alga Gracilaria tenuistipitata could be used for the efficient removal of lac dye from aqueous solution was assessed in this work. The effects of parameters such as initial pH, biosorbent dosage, contact time, initial dye concentration, and temperature on the biosorption capacity of the dye were investigated. Equilibrium data were analysed using Langmuir, Freundlich, and Temkin isotherm models and the Freundlich model provided the highest coefficient of determination values. Biosorption kinetic data were successfully described with a pseudo-second-order model at initial dye concentrations of 50, 80, 100, and 120 mg l

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Physico-chemical and gel properties of agar from Gracilaria tenuistipitata from the lake of Songkhla, Thailand

Cited by 114 publications

References 38 publications

Membrane fouling in a membrane bioreactor: High filtration resistance of gel layer and its underlying mechanism

Membrane fouling in a membrane bioreactor: High filtration resistance of gel layer and its underlying mechanism

Reuse of red algae waste for the production of cellulose nanocrystals and its application in polymer nanocomposites

Biosorption of lac dye by the red marine alga Gracilaria tenuistipitata: biosorption kinetics, isotherms, and thermodynamic parameters

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