Improved alternate deposition of biodegradable naturally occurring polymers onto a quartz crystal microbalance

Serizawa, Takeshi; Goto, Hidetada; Kishida, Akio; Endō, Takeshi; Akashi, Mitsuru

doi:10.1002/(sici)1099-0518(19990315)37:6<801::aid-pola15>3.0.co;2-o

Cited by 35 publications

(39 citation statements)

References 13 publications

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“…The almost linear increase in absorbance is similar to other chitosan LBL films characterized by quartz crystal microbalance [31] and UV-vis spectroscopy. [32] The response of the LBL chitosan/PSS film was checked by measuring the impedance, from 10 Hz to 1 MHz, several times in Milli-Q water, before and after the measurements in different samples.…”

Section: Resultssupporting

confidence: 81%

“…For example, LBL chitosan films have been proposed for use in blood coagulation, [34] in sensors of paraoxon, [35] and in optical storage devices. [32] Other LBL chitosan films reported in the literature were prepared with charged vinyl polymers, [36] poly(g-glutamic acid), [31,37] and dextran sulfate. [38] Conclusion A sensor array comprising only two units, namely a bare gold electrode and a thin LBL chitosan/PSS film, was successfully used in the recognition of substances corresponding to specific tastes, at low molar concentrations.…”

Section: Resultsmentioning

confidence: 99%

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A Layer‐by‐Layer Film of Chitosan in a Taste Sensor Application

Santos¹,

Riul

Malmegrim

et al. 2003

Macromolecular Bioscience

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Chitosan is alternated with sulfonated polystyrene (PSS) to build layer‐by‐layer (LBL) films that are used as sensing units in an electronic tongue. Using impedance spectroscopy as the principle method of detection, an array using chitosan/PSS LBL film and a bare gold electrode as the sensing units was capable of distinguishing the basic tastes – salty, sweet, bitter, and sour – to a concentration below the human threshold. The suitability of chitosan as a sensing material was confirmed by using this sensor to distinguish red wines according to their vintage, vineyard, and brands.PCA Plot for red wine samples obtained from impedance measurements at 1 kHz for the sensor array comprising a 3‐bilayer chitosan/PSS film and a bare gold electrode.magnified imagePCA Plot for red wine samples obtained from impedance measurements at 1 kHz for the sensor array comprising a 3‐bilayer chitosan/PSS film and a bare gold electrode.

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 99%

A Layer‐by‐Layer Film of Chitosan in a Taste Sensor Application

Santos¹,

Riul

Malmegrim

et al. 2003

Macromolecular Bioscience

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“…[14] In this case, the multilayer film deposition was carried out by the alternate immersion into aqueous CT and g-PGA solutions including a significant amount of organic solvents such as acetone, acetonitrile, and N,Ndimethylformamide. Taking into account the biomedical application of the hollow nanocapsule, we again examined conditions for the deposition of CT-g-PGA multilayer films onto a substrate using aqueous solutions excluding organic solvents as immersion solvents.…”

Section: Resultsmentioning

confidence: 99%

Preparation and Unique pH‐Responsive Properties of Novel Biodegradable Nanocapsules Composed of Poly(γ‐glutamic acid) and Chitosan as Weak Polyelectrolytes

Imoto

Kida

Matsusaki

et al. 2010

Macromolecular Bioscience

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Novel biodegradable hollow nanocapsules composed of two kinds of weak polyelectrolytes, CT and gamma-PGA, were successfully prepared by the deposition of their LbL-assembled films onto silica particles and the subsequent removal of the silica. These CT-gamma-PGA hollow nanocapsules showed unique size increases at pH = 1.0, due to the swelling of capsule membranes induced by electrostatic repulsions between ammonium groups of CT components. On the other hand, no significant changes in the capsule size were observed at pH = 4.0, 7.0, and 10. By using the CT-gamma-PGA nanocapsules, the release of encapsulated substances in response to acidic pH values was accomplished.

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“…36,42 This high purity level is very attractive since commercially available g-PGA usually has low (c.a. 70%) or unknown purity levels, 33,[43][44][45] which may hinder its application in the biomedical field, and especially when it comes to clinical translation.…”

Section: Introductionmentioning

confidence: 99%