Handbook of Cosmetic Science and Technology

Draelos, Z. D.

doi:10.1001/archderm.138.9.1262-a

Cited by 7 publications

(3 citation statements)

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“…The use of aqueous solutions provides a more cost-effective and environmentally friendly approach that has the potential to replace the current methodologies for guanine formation, and specifically the use of biogenic anhydrous guanine crystals extracted from fish. Fish guanine crystals are used in a variety of industries including cosmetics and paints. − While for some of the industrial uses fish guanine is suitable, for others, controlling the size and morphology of the guanine crystals could prove to be highly beneficial. Earlier studies on guanine crystals have shown that control over crystal morphology is possible .…”

Section: Resultsmentioning

confidence: 99%

“…The optical properties of anhydrous guanine, together with the fact that it is nonhazardous and easy to obtain, makes it a promising candidate material to be incorporated into artificial systems. In fact, guanine is being used in a variety of products in industries, such as cosmetics, paints, and jewelry. − Guanine was recently incorporated into sophisticated systems with dynamic control over crystal orientation, providing magnetically tunable reflectivity. , However, all these systems use anhydrous guanine crystals extracted from biological specimens, namely, fish scales. The use of fish crystals limits the possibilities of varying crystal dimension, morphology, and material quantity for industrial applications.…”

Section: Introductionmentioning

confidence: 99%

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Guanine Crystallization in Aqueous Solutions Enables Control over Crystal Size and Polymorphism

Gur

Pierantoni

Dov

et al. 2016

Crystal Growth & Design

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Anhydrous guanine crystals are among the most widespread organic crystals used by organisms to produce structural colors. The main advantage of guanine is its exceptionally high refractive index in the reflecting direction (∼1.8). For the same reason, guanine is a promising candidate material for a variety of different optical applications. Crystallization of guanine is challenging and usually involves using polar aprotic organic solvents such as dimethyl sulfoxide (DMSO). Here, we show that the crystallization of guanine from aqueous solutions is possible under conditions that provide control over crystal polymorphism and size. Using this approach we were able produce large crystals of the elusive guanine monohydrate phase. We were also able to rationalize the formation of the different phases obtained as a function of which tautomer of guanine is stable in solutions of varying pH.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Guanine Crystallization in Aqueous Solutions Enables Control over Crystal Size and Polymorphism

Gur

Pierantoni

Dov

et al. 2016

Crystal Growth & Design

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“…Radikal bebas dapat terbentuk karena adanya radiasi sinar ultraviolet (Suhartono, 2016). Paparan sinar ultraviolet (UV) secara terus menerus dapat menyebabkan kerusakan kulit seperti adanya bintik-bintik akibat pigmentasi, hilangnya elastisitas kulit, keriput, dan kulit kasar (Barel et al, 2009). Kerusakan yang terjadi akibat radikal bebas dapat dinetralisir dengan antioksidan (Percival, 1998).…”

Section: Pendahuluanunclassified

Karakterisasi Fisik dan Aktivitas Antioksidan Masker Wajah Gel Pell Off Yang Mengandung Sari Buah Naga (Hylocerus polyrhizus)

Setiawati

Sukmawati

2019

Pharmaceutical Journal Of Indonesia

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Damaged skin due to free radicals from ultraviolet radiation can be prevented using antioxidants. Red dragon fruit (Hylocereus polyrhizus) containing antioxidants can be made into a peel off gel face mask using gelatin as a gelling agent to be applied easily to the skin. The purpose of this study is to determine the effect of various gelatin concentrations on the physical properties and antioxidant activity of peel off gels containing red dragon fruit juice. The peel off gels face mask were made using various gelatin concentration i.e 7.5% w/w (F1); 10% w/w (F2); and 12.5% w/w and containing 10% w/w red dragon fruit. The peel off gels then evaluated for physical properties and antioxidant activity using DPPH. The result showed that the increasing of the gelatin concentration would increase the drying time and adhesive ability of the peel off gels. The escalation of gelatin concentration from 7.5% w/w (F1) to 10% w/w (F2) did not affect the spreading ability of the peel off gel. However, the spreading ability of the peel off gel decreased with the increasing concentration of gelatin from 10% w/w (F2) to 12.5% w/w (F3). The antioxidant test of peel off gel had an average percentage of inhibition of 9.101% (F1); 12.469% (F2); and 15.109% (F3). Based on the results of physical properties and antioxidant activity showed that formula 2 was recomended.

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The Mechanism of Color Change in the Neon Tetra Fish: a Light‐Induced Tunable Photonic Crystal Array

et al. 2015

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The fresh water fish neon tetra has the ability to change the structural color of its lateral stripe in response to a change in the light conditions, from blue‐green in the light‐adapted state to indigo in the dark‐adapted state. The colors are produced by constructive interference of light reflected from stacks of intracellular guanine crystals, forming tunable photonic crystal arrays. We have used micro X‐ray diffraction to track in time distinct diffraction spots corresponding to individual crystal arrays within a single cell during the color change. We demonstrate that reversible variations in crystal tilt within individual arrays are responsible for the light‐induced color variations. These results settle a long‐standing debate between the two proposed models, the “Venetian blinds” model and the “accordion” model. The insight gained from this biogenic light‐induced photonic tunable system may provide inspiration for the design of artificial optical tunable systems.

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Handbook of Cosmetic Science and Technology

Cited by 7 publications

References 0 publications

Guanine Crystallization in Aqueous Solutions Enables Control over Crystal Size and Polymorphism

Guanine Crystallization in Aqueous Solutions Enables Control over Crystal Size and Polymorphism

Karakterisasi Fisik dan Aktivitas Antioksidan Masker Wajah Gel Pell Off Yang Mengandung Sari Buah Naga (Hylocerus polyrhizus)

The Mechanism of Color Change in the Neon Tetra Fish: a Light‐Induced Tunable Photonic Crystal Array

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