Fluorescent colored material made of clay mineral and phycoerythrin pigment derived from seaweed

Lin, Yi-Hung; Hori, Yumiko; Hoshino, Saki; Miyazawa, Chiho; Kohno, Yoshiumi; Shibata, Masashi

doi:10.1016/j.dyepig.2013.08.022

Cited by 13 publications

(7 citation statements)

References 23 publications

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“…Therefore, they are suitable for the use as a colorant of foods and cosmetics, where direct contact with human body cannot be avoided [1,2]. In addition, the naturally occurring dyes are better than the synthetics in regard to the consumer perception because they are not artificial materials.…”

Section: Introductionmentioning

confidence: 99%

Enhanced stability of natural anthocyanin incorporated in Fe-containing mesoporous silica

Kohno

Kato

Shibata

et al. 2015

Microporous and Mesoporous Materials

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Anthocyanin is known as a safe coloring material although its poor stability often limits more extended use. In this study, we tried the enhancement of the photostability of the anthocyanin by the incorporation into the pore of HMS type mesoporous silica containing various metal 2 ions. The anthocyanin was adsorbed on the HMS by pouring a highly concentrated anthocyanin solution to the dried HMS, urging the incorporation of the dye into the mesopore by a capillary condensation. Improved stability of the anthocyanin against visible irradiation was achieved by the adsorption onto the HMS containing Fe 3+ , although other metal ions in the HMS showed less effect on the stabilization. From the UV-Vis spectroscopy, the Fe 3+ species effective for the stabilization of the anthocyanin was found to be the tetrahedral one highly dispersed in the silica framework. The decrease in the absorptivity of the anthocyanin on the Fe-HMS compared to other metal-containing HMS suggested that the Fe-HMS promoted the aggregate formation of the anthocyanin molecules. The highly dispersed Fe 3+ species had an ability to gather the anthocyanin molecule close to itself, resulting in tight incorporation of the dye inside the mesopore. The incorporation and aggregate formation of the anthocyanin was expected to contribute to the improvement of the stability against irradiation.

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Section: Introductionmentioning

confidence: 99%

Enhanced stability of natural anthocyanin incorporated in Fe-containing mesoporous silica

Kohno

Kato

Shibata

et al. 2015

Microporous and Mesoporous Materials

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“…The inclusion of the dye as a guest molecule into inorganic host materials is a promising approach, like the ancient Mayan people who used the composite of indigo and palygorskite clay for their colorant [15,16]. The intercalation of cationic or anionic dye molecule into the clay interlayer has been carried out to enhance the stability of the dye [17][18][19][20][21][22][23][24]. We have also reported the stability enhancement of the natural dye such as anthocyanin [25] and carmine [26] by the intercalation between the clay layers.…”

Section: Introductionmentioning

confidence: 99%

Improved photostability of hydrophobic natural dye incorporated in organo-modified hydrotalcite

Kohno

Asai

Shibata

et al. 2014

Journal of Physics and Chemistry of Solids

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The β-carotene and annatto extract are typical carotenoids used as a safe colorant of foods. However, the instability against irradiation limits their wide use. The improvement of the stability was investigated by the intercalation of the dye into the interlayer space of the anion-exchangeable clay, hydrotalcite. The hydrophobic environment was constructed in the interlayer space of the hydrotalcite by the modification with anionic surfactant (dodecyl sulfate and dodecylbenzene sulfonate). The lipophilic β-carotene and annatto dye were successfully incorporated into the organo-modified hydrotalcite, and the incorporated dye exhibited the improved photostability under visible irradiation from a 100 W halogen lamp (190 klux) in the air. The effect of the stabilization on the anionic annatto dye was higher by the incorporation in the modified hydrotalcite than in the modified cation exchangeable clay, suggesting that the polarity of the clay sheet had some influence on the stabilization of the incorporated dye. The stabilization effect of the β-carotene was not so significant as that of the annatto dye, because sufficient intercalation of the non-polar β-carotene may require stronger hydrophobic environment. The π-π interaction between the β-carotene and the benzene ring of the dodecylbenzene sulfonate was found to contribute to the stability enhancement.

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“…Such hybrid pigments, when applied to polymers, can act as multifunctional additives that modify different properties of the materials (transparency, mechanical properties or thermal stability). The modification of inorganic carriers inspired by the ancient Maya Blue pigment has been found to be a promising way of transforming soluble natural and synthetic dyes into insoluble organic-inorganic pigments [17,18,19,20,21,22]. Inorganic hosts, including aluminum hydroxide (Al(OH) 3 ), magnesium hydroxide (Mg(OH) 2 ) or layered double hydroxides, are commonly used in technology, and represent a large group of halogen-free flame retardants for polymer materials [23,24,25].…”

Section: Introductionmentioning

confidence: 99%

New Organic/Inorganic Pigments Based on Azo Dye and Aluminum-Magnesium Hydroxycarbonates with Various Mg/Al Ratios

et al. 2019

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This study set out to investigate the impact of aluminum-magnesium hydroxycarbonates (LHs) with various Mg/Al ratios on the formation of hybrid pigments. The colorants were also evaluated for their flame-retardant properties. In the first part of the study, the hybrid pigments were submitted to comprehensive characterization using time-of-flight secondary ion mass spectrometry (TOF-SIMS), 27Al solid-state nuclear magnetic resonance (NMR) spectroscopy, powder X-ray diffraction analysis (XRD), thermogravimetric analysis (TGA), and N2 adsorption as well as scanning and transmission electron microscopy (SEM/STEM). The relationship between the Mg/Al ratios of the LH carriers and the formation of lake pigments was explored. The TOF-SIMS spectrum of LH modified with azo chromophore (AC) showed an intense peak for the C19H15O5N2Mg+ ion, confirming metal-dye interactions. Incorporation of the organic colorant into the LH host enhanced its resistance to dissolution in organic solvent (butyl acetate), as well as improving its color stability under elevated temperatures. The second part of the study evaluated the flammability of ethylene-norbornene (EN) composites, in which the pigments had been applied as colorants. Cone calorimetry revealed that addition of the organic-inorganic pigments resulted in a substantial improvement of the flame retardancy, reflected by the decreased values of the heat release rate (HRRMAX) and total heat release parameter (THR) of the EN composites in comparison to a neat sample (unfilled EN).

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Fluorescent colored material made of clay mineral and phycoerythrin pigment derived from seaweed

Cited by 13 publications

References 23 publications

Enhanced stability of natural anthocyanin incorporated in Fe-containing mesoporous silica

Enhanced stability of natural anthocyanin incorporated in Fe-containing mesoporous silica

Improved photostability of hydrophobic natural dye incorporated in organo-modified hydrotalcite

New Organic/Inorganic Pigments Based on Azo Dye and Aluminum-Magnesium Hydroxycarbonates with Various Mg/Al Ratios

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