Characterization of calcium alginate and chitosan-treated calcium alginate gel beads entrapping allyl isothiocyanate

Kim, Dong-Won; Chung, Hee Sik; Shin, Il Shik; Yam, Kit L.; Chung, Donghwa

doi:10.1016/j.carbpol.2007.06.028

Cited by 74 publications

(46 citation statements)

References 26 publications

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“…However, the toxicity of barium ions makes calcium ions a preferential divalent cation. Although alginate bead with chitosan hardening treatment showed higher stability [24], immobilized Phaeodactylum tricornutum with chitosan hardening treatment showed a weak growth performance [17]. Those authors attributed the weak growth performance to the occurrence of growth limiting conditions for the microalgae within the alginate matrix.…”

Section: Bead Stability In Marinementioning

confidence: 99%

Feasibility of Marine Microalgae Immobilization in Alginate Bead for Marine Water Treatment: Bead Stability, Cell Growth, and Ammonia Removal

Soo

Chen

Bojo

et al. 2017

International Journal of Polymer Science

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Sodium alginate is the most commonly used polymer matrix in microalgae immobilization for water treatment. However, the susceptibility of alginate matrixes to cation chelating agents and antigelling cation limits the use of alginates in estuarine and marine systems. Hence, the present study aims to investigate the stability of alginate bead in marine water and the feasibility of microalgae to grow when immobilized in alginate bead for marine water treatment. Different concentrations of alginate and hardening cation calcium were used to formulate beads. The beads were incubated in Guillard's f/2 medium and shaken vigorously by using orbital shaker for 15 days. The results indicated that bead stability was enhanced by increasing alginate and CaCl 2 concentrations. Subsequently, the marine microalga, Nannochloropsis sp., was immobilized in calcium alginate bead. The growth and ammoniacal-nitrogen (NH 4 + -N) uptake by immobilized cell were compared with free cell culture in f/2 medium. Specific growth rate of immobilized cell (0.063 hr −1 ) was significantly higher than free cell (0.027 hr −1 ). There was no significant difference on specific uptake rate of free cell and immobilized cell; but immobilized cell removed significantly more NH 4 + -N (82.2%) than free cell (47.3%) culture at the end of the experiment. The present study demonstrated the potential use of alginate immobilization technique in marine microalgae culture and water treatment simultaneously.

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Section: Bead Stability In Marinementioning

confidence: 99%

Feasibility of Marine Microalgae Immobilization in Alginate Bead for Marine Water Treatment: Bead Stability, Cell Growth, and Ammonia Removal

Soo

Chen

Bojo

et al. 2017

International Journal of Polymer Science

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“…aureus and Campylobacter jejuni, in vitro [16][17][18] or in meat products including ground beef, fresh chicken, fermented sausage and Westphalian ham [19], its high volatility, strong pungency limit its application in food systems [20]. Several materials such as alginate beads, cyclodextrin, maize, and mesoporous silica were used to adsorb AITC and its subsequent release to control microorganisms.…”

Section: Monocytogenes S Typhimurium Bacillus Cereus Staphylococcusmentioning

confidence: 99%

Evaluation of Antimicrobial Activity of Allyl Isothiocyanate (AITC) Adsorbed in Oyster Shell on Food-borne Bacteria

Han¹,

Ahmed²,

Chun

2015

Clean Technology

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주제어 : 소성, 굴, Allyl isothiocyanate (AITC), 항균 Abstract : Oyster shells are a waste product from mariculture that creates a major disposal problem in coastal regions of southeast Korea. To make practical use of unused oyster shells, calcined oyster shell (COS) collected from a local company was allowed to adsorb AITC (allyl isothiocyanate), and then tested the powder's ability to inhibit the growth of some potential food borne disease-causing bacteria. COS powder showed bacteriostatic effect that inhibited cell growth of Escherichia coli, Staphylococcus aureus and Salmonella typhimurium from 3 to 5 log10 CFU/mL at concentrations around 1%. The MIC of pure AITC was found as 1 mg/mL, 0.8 mg/mL and 0.7 mg/mL for Escherichia coli, Staphylococcus aureus and Salmonella typhimurium, respectively. The calcined powder adsorbed about 225 mg of AITC per gram of shell, indicating porous material was created by calcination. FTIR data confirmed the adsorption of AITC by COS. Characterization of particle data showed very fine particle size and highly convoluted surface. AITC adsorbed calcined oyster shell (ACOS) completely inhibited bacterial cell at 1% concentration. ACOS showed better antibacterial effect than COS, indicating synergistic effect of AITC and calcined oyster shell powder on bacteria.

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“…Alginate (SA), a polysaccharide extracted from brown algae, polymerized through 1,4-glycosidic bond from b-D-mannuronic acid (M unit) and a-L-guluronic acid (G unit), is a non-toxic and naturally biodegradable green material [8,9]. As a polyanionic copolymer, the SA molecular chain contains many carboxyl and hydroxyl residues, which makes it possess the character of better strength to form the polyelectrolyte complexes with the polycation (such as poly-L-lysine, chitosan) [8], also form insoluble gel from the ion and polyvalent metal (such as Ca 2? )…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of composite hydrogel beads based on sodium alginate

Chen

Dong

et al. 2015

Polym. Bull.

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In this report, novel biopolymer hydrogels composed of sodium alginate (SA) and the oxidized sodium alginate (OSA) with an interpenetrating polymer network (IPN) structure were prepared by a combination of chemical and ionic cross-linking approaches. By using SA as the main raw material, OSA was obtained using sodium periodate. The gelation process of the IPN hydrogels was the formation of dual network: one gelatin network cross-linked by OSA with dihydrazide and another SA network cross-linked by Ca 2? . The factors which affect its swelling properties were discussed. The best swelling ratio of the beads was 2300, and the swelling property was greatly affected by pH and preparation condition. The stability and swelling behavior of OSA/SA gel beads were better improved than the pure SA/Ca 2? system. The OSA/SA hydrogel beads with the pH sensitivity and stability will be a good candidate for site-specific controlled drug release carrier.

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Characterization of calcium alginate and chitosan-treated calcium alginate gel beads entrapping allyl isothiocyanate

Cited by 74 publications

References 26 publications

Feasibility of Marine Microalgae Immobilization in Alginate Bead for Marine Water Treatment: Bead Stability, Cell Growth, and Ammonia Removal

Feasibility of Marine Microalgae Immobilization in Alginate Bead for Marine Water Treatment: Bead Stability, Cell Growth, and Ammonia Removal

Evaluation of Antimicrobial Activity of Allyl Isothiocyanate (AITC) Adsorbed in Oyster Shell on Food-borne Bacteria

Preparation and characterization of composite hydrogel beads based on sodium alginate

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