Chitosan-based microcapsules containing grapefruit seed extract grafted onto cellulose fibers by a non-toxic procedure

Alonso, Diana; Gimeno, Miquel; Sepúlveda-Sánchez, José D.; Shirai, Kohji

doi:10.1016/j.carres.2010.01.018

Cited by 59 publications

(48 citation statements)

References 15 publications

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“…To determine the capsule release profile as a function of membrane composition and fluidity, we add a suspension of capsules in water to hydrocarbon oil within a glass cubic cell (1 cm 3 ). To form an aqueous globule (5 mm diameter) in oil, the cubic cell is pretreated with noctadecyltrimethoxy silane to prevent the wetting of water on the glass surface.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Polymer Microcapsules with Programmable Active Release

et al. 2013

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We present a new type of microcapsule programmed with a tunable active release mechanism. The capsules are triggered by a plasticizing stimulus that induces a phase change transition of the polymeric membrane from a solid to a fluidized form; thereafter, the cargo is actively driven out of the capsule through a defect at the capsule wall with controllable release kinetics. Tuning the degree of membrane fluidity by tailoring the amount of plasticizing stimulus present allows us to obtain temporal variation of the release kinetics from a subsecond abrupt burst release to a slow sustained release of encapsulant over many minutes. Moreover, we demonstrate tuning of the collective capsule triggering response by adjusting stimulus content, polymer molecular weight, and capsule membrane thickness. For this model system, we use a microfluidic approach to fabricate polystyrene capsules triggered by a toluene stimulus. However, this active release approach is general and is applicable to diverse polymeric capsule systems; this versatility is demonstrated by extension of our trigger-release scheme to capsules fabricated from a rubberlike block copolymer. The utility of our technique further enhances the potential of these active release capsules for practical application.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Polymer Microcapsules with Programmable Active Release

et al. 2013

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“…Core-shell nanoparticles that consist of silver nanoparticles (Ag 0 ) as the core and chitosan-O-methoxy polyethylene glycol (CTS-O-MPEG) as the shell were applied to cotton fabrics possessing excellent antibacterial activity via the conventional pad-dry-cure method using citric acid as crosslinking agent (Abdel-Mohsen et al 2012). Chitosan-based microcapsules containing grapefruit seed oil extract were grafted onto cellulose using citric acid monohydrate as crosslinker (Alonso et al 2010). Chitosan was applied on cotton fabric or on chemically modified cotton (having reactive -CHO or carboxymethyl groups) to obtain easy-care characteristics and bioactive textiles (El-tahlawy et al 2005;Hebeish et al 2011;Kim et al 2003;Kulkarni et al 2010;Mocanu et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Covalent bonding and photochromic properties of double-shell polyurethane-chitosan microcapsules crosslinked onto cotton fabric

2015

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The research aims at treating cotton fabrics with double-shell polyurethane-chitosan photochromic microcapsules using the coating method. FTIR indicated that an acylamino group formed between the hydroxyl of cotton fabric and amino group of the chitosan shell. The surface morphology of treated cotton fabrics revealed the compact and uniform distribution of double-shell polyurethanechitosan microcapsules on cotton fabrics. Factors affecting the covalent bonding such as the citric acid (CA) and double-shell polyurethane-chitosan microcapsule (DSPCM) concentration were studied. The K/ S value of treated fabric using 9 wt% CA increased significantly; it increased by 157.0 % compared with 5 % CA. It remained almost unchanged when the CA concentration was 11 wt%. In addition, as for 7 wt% CA-treated cotton fabric, the K/S value increased by 53.5 %. The K/S values increased by 27.29 and 42.08 %, respectively, when the concentration reached 4 and 6 wt%. The color properties of samples treated with 8 wt% concentration microcapsules increased by 44.72 %. The K/S value decreased slightly after increased launderings. It decreased by 1.73 % after 30 launderings, but did not present any changes after 40 launderings; it decreased by 8.55 % after 50 launderings. The surface morphology of treated cotton fabric samples after 50 launderings remained almost the same as the original ones. It can be speculated that the covalent bonding fastness between DSPCM and cotton fabric is good. Additionally, it possesses good thermal stability. It can be concluded that 9 % citric acid concentration and 8 % DSPCM concentration allow obtaining bright and uniform color and a quick response to UV-Vis light.

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“…A solubilização ocorre por protonação da função-NH2 na posição da unidade de repetição de D-glucosamina, em que o polissacarídeo é convertido para um polieletrólito em meios ácidos. Suas características são: coloração branca, dura e inelástica (ALONSO et al, 2010;HOVEN et al, 2007;DUTTA et al, 2004;HIRANO, 1999) A quitosana é barata, biodegradável e atóxica para mamíferos, sendo adequada para utilização na indústria alimentar (KOIDE, 1998 É um polímero com característica química não ramificado formado por unidades de N-acetil-Dglucosaminas, unidas por ligações (1 e 4) e formando cadeias de várias centenas de unidades (CANELLA e GARCIA, 2001;HOVEN et al, 2007).…”

Section: Quitina E Quitosanaunclassified

Desenvolvimento e análise de bandagem de bioestimulação dentino/pulpar (BBio)

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Chitosan-based microcapsules containing grapefruit seed extract grafted onto cellulose fibers by a non-toxic procedure

Cited by 59 publications

References 15 publications

Polymer Microcapsules with Programmable Active Release

Polymer Microcapsules with Programmable Active Release

Covalent bonding and photochromic properties of double-shell polyurethane-chitosan microcapsules crosslinked onto cotton fabric

Desenvolvimento e análise de bandagem de bioestimulação dentino/pulpar (BBio)

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