Encapsulated recyclable porous materials: an effective moisture-triggered fragrance release system

Vaughn, John S.; Wu, Haohan; Efremovska, Bisera; Olson, David H.; Mattai, J.; Ortiz, Claudio; Puchalski, Allen E.; Li, Jing; Pan, Long

doi:10.1039/c3cc41236a

Cited by 45 publications

(37 citation statements)

References 32 publications

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“…Microencapsulation is a versatile technique commonly used for isolation, protection, and controlled delivery of active core materials in a wide range of applications and industries including drug delivery [11], self-healing materials [12], nutrient preservation [13], and perfumery [14]. The versatility of microcapsules is exemplified by the ability to release their core material in response to a variety of environmental stimuli including chemical triggers (e.g.…”

Section: Introductionmentioning

confidence: 99%

Encapsulation of grape seed extract in polylactide microcapsules for sustained bioactivity and time-dependent release in dental material applications

et al. 2017

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Objective To sustain the bioactivity of proanthocyanidins-rich plant-derived extracts via encapsulation within biodegradable polymer microcapsules. Methods Polylactide microcapsules containing grape seed extract (GSE) were manufactured using a combination of double emulsion and solvent evaporation techniques. Microcapsule morphology, size distribution, and cross-section were examined via scanning electron microscopy. UV-vis measurements were carried out to evaluate the core loading and encapsulation efficiency of microcapsules. The bioactivity of extracts was evaluated after extraction from capsules via solvent partitioning one week or one year post-encapsulation process. Fifteen human molars were cut into 7mm × 1.7 mm μ0.5 mm thick mid-coronal dentin beams, demineralized, and treated with either encapsulated GSE, pristine GSE, or left untreated. The elastic modulus of dentin specimens was measured based on three-point bending experiments as an indirect assessment of the bioactivity of grape seed extracts. The effects of the encapsulation process and storage time on the bioactivity of extracts were analyzed. Results Polynuclear microcapsules with average diameter of 1.38 μm and core loading of up to 38wt% were successfully manufactured. There were no statistically significant differences in the mean fold increase of elastic modulus values among the samples treated with encapsulated or pristine GSE (p = 0.333), or the storage time (one week versus one year storage at room temperature, p = 0.967). Significance Polynuclear microcapsules containing proanthocyanidins-rich plant-derived extracts were prepared. The bioactivity of extracts was preserved after microencapsulation.

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Section: Introductionmentioning

confidence: 99%

Encapsulation of grape seed extract in polylactide microcapsules for sustained bioactivity and time-dependent release in dental material applications

et al. 2017

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“…. [21] Two fragrant guests with distinct natures, namely, hydrophilic (ethyl butyrate) and hydrophobic (d-limonene), were encapsulated into the host framework. When water was added to the sealed vial that contained the loaded compounds (simulated underarm moisture), the MOFs began to decompose with slow release of fragrant molecules ( Figure 6).…”

Section: Kitagawa and Co-workers Have Demonstrated A Sensing Methods Fmentioning

confidence: 99%

Stimulus‐Responsive Metal–Organic Frameworks

Nagarkar

Desai

Ghosh

2014

Chemistry An Asian Journal

114

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Materials that can recognize the changes in their local environment and respond by altering their inherent physical and/or chemical properties are strong candidates for future "smart" technology materials. Metal-organic frameworks (MOFs) have attracted a great deal of attention in recent years owing to their designable architecture, host-guest chemistry, and softness as porous materials. Despite this fact, studies on the tuning of the properties of MOFs by external stimuli are still rare. This review highlights the recent developments in the field of stimulus-responsive MOFs or so-called smart MOFs. In particular, the various stimuli used and the utility of stimulus-responsive smart MOFs for various applications such as gas storage and separation, sensing, clean energy, catalysis, molecular motors, and biomedical applications are highlighted by using representative examples. Future directions in the developments of stimulus-responsive smart MOFs and their applications are proposed from a personal perspective.

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“…Moreover, pro‐fragrance techniques are often costly . In the case of physical methods, the general approach involves encapsulating the fragrance in a shell, or using microporous metal–organic materials . Encapsulation within a shell relies on stabilizing the fragrance in aqueous medium before synthesizing the shell as a physical barrier, using techniques such as microfluidics or interfacial polymerization .…”

Section: Introductionmentioning

confidence: 99%

“…3 In the case of physical methods, the general approach involves encapsulating the fragrance in a shell, [10][11][12] or using microporous metal-organic materials. 13 Encapsulation within a shell relies on stabilizing the fragrance in aqueous medium before synthesizing the shell as a physical barrier, using techniques such as microfluidics or interfacial polymerization. [14][15][16] Further coating of these microcapsules with functional compounds such as chitosan has been shown to prolong the sustained release of fragrance.…”

Section: Introductionmentioning

confidence: 99%

Designing nanoporosity in a swollen polymer for the controlled release of a highly volatile fragrance

Chen

Bhardwaj

Sharifah

et al. 2018

Flavour & Fragrance J

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Controlling the fragrance release profile, especially the highly volatile top note, can prolong the desired scent of the fragrance. Here, the porosity of a swollen cross‐linked polyurethane acrylate (PUA) polymer, which is tuned by the length of a modulator, can influence the evaporation rate of the top note. In particular, the evaporation rate of benzyl acetate (BA), a common top note, is reduced by a factor of 6.5 (from 134 to 17 mg m–2 min–1) when BA is released from the best‐performing PUA against a reservoir of BA. The average diameter of an opening in the fragrance‐loaded PUA is ~6 nm, as determined by the thermoporosimetry approach. Such a pore size can effectively control the evaporation rate of BA, as predicted by the theoretical model, which reveals that a pore diameter of <16 nm is required. Computational modelling reveals the optimal chain length for a modulator used for the sustained released of fragrance, confirming the experimental data. Finally, BA continues to be released from the PUA matrix for a prolonged period, even after 3 months, whereas the same quantity of BA would completely evaporate after 1 week in the absence of PUA matrix. Approximately 50wt% of BA remains after 60 days, making it one of the best techniques in sustaining the release of a top note.

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Encapsulated recyclable porous materials: an effective moisture-triggered fragrance release system

Cited by 45 publications

References 32 publications

Encapsulation of grape seed extract in polylactide microcapsules for sustained bioactivity and time-dependent release in dental material applications

Encapsulation of grape seed extract in polylactide microcapsules for sustained bioactivity and time-dependent release in dental material applications

Stimulus‐Responsive Metal–Organic Frameworks

Designing nanoporosity in a swollen polymer for the controlled release of a highly volatile fragrance

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