Optical second-harmonic images of sacran megamolecule aggregates

Zhao, Yue; Hien, Khuat Thi Thu; Mizutani, Goro; Rutt, H.N.; Amornwachirabodee, Kittima; Okajima, Maiko K.; Kaneko, Tatsuo

doi:10.1364/josaa.34.000146

Cited by 9 publications

(15 citation statements)

References 55 publications

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“…S1 (Supplementary Information), the electric current before dropping sacran aqueous solution into the cell was less than 10 μA. The observation method for observing SHG was the same as that described in our previous report [23]. Figure 2 shows the current as a function of time after 3 drops (about 70 μL) of high purity sacran aqueous solution with the concentration of 0.5% was put between the needle electrode biased at -6 V and the ring electrode.…”

Section: Methodsmentioning

confidence: 96%

“…Sacran aggregates can generate SHG light because of their macroscopic ordered structure [23]. Zhao et al [23] reported that SHG microspots of several tens of μm size were observed from cotton-like lump, fibers, and cast films of sacran. The polarization-dependent SHG microscopic images showed that SHG spot has a concentric multilayer structure of liquid crystal domains.…”

Section: Introductionmentioning

confidence: 99%

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Electric Field Effect on Optical Second-harmonic Generation of Amphoteric Megamolecule Aggregates

Zhao

Hien

et al. 2017

J. Phys. Soc. Jpn.

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We have detected second-order nonlinear optical response from an amphoteric mega-saccharides named sacran under a needle/ring electrode stimulus by using an optical second harmonic generation (SHG) microscope. SHG was observed from sacran in the neighborhood of the negatively biased needle electrode below -4.5 V with respect to the outer ring electrode. From the incident light polarization dependence of SHG, this sacran was suggested to be oriented toward the electrode needle. SHG of the sacran polymer was judged to be induced by sacran aggregates with net positive charge.

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Section: Methodsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Electric Field Effect on Optical Second-harmonic Generation of Amphoteric Megamolecule Aggregates

Zhao

Hien

et al. 2017

J. Phys. Soc. Jpn.

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“…Furthermore, sacran in aqueous solution also has a periodic nanostructure, which was clarified by the synchrotron X-ray scattering method [59]. The microdomains have also been observed by utilizing optical second-harmonicgeneration microscopy [60], where they showed sufficiently high second-order nonlinear susceptibilities. For the preparation of advanced biomaterials, various approaches have been developed by demonstrating cell scaffolds [36], anti-inflammatory [61], anti-allergic effects on the human body, etc.…”

Section: Conclusion and Future Perspectivesmentioning

confidence: 97%

The cyanobacterial polysaccharide sacran: characteristics, structures, and preparation of LC gels

Okeyoshi

Okajima

Kaneko

2020

Polym J

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To shift from a petroleum-dependent society to a sustainable society using eco-friendly materials, polysaccharides from natural products are important candidates as alternative materials. We have researched one cyanobacterial polysaccharide, "sacran", which is extracted from Aphanothece sacrum. In this review, the unique characteristics and structures of sacran and the preparation of liquid crystal gels are introduced: polymer properties such as megamolecular weight, that is, a weight > 10 7 g/mol; characteristic viscosity; liquid crystallinity (LC); fiber structures on the nanometer/micrometer scale; gel formation with heavy metal ions; photoshrinking in gels composed of metal ions; anisotropically swelling gels; orientation upon drying of the air-LC interface; meniscus splitting; and membrane formation with uniaxial orientation, which are the results of self-organization. These matters are discussed particularly from the perspectives of polymer science, colloidal science, gel science, etc. We expect that sacran will be applicable in a variety of fields, such as tissue engineering, pharmacodynamics, and biomedical materials, with possible contributions to the development of a sustainable material society.

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“…Sacran is a heteropolysaccharide composed of sugar residue (galactose, glucose, mannose, xylose, rhamnose, fucose, and galacturonic acid, and glucuronic acid). It also contains traces of alanine, galactosamine, uronic acid, and muramic acid; 11% of the monosaccharide contains sulfate groups, while 22% of the monosaccharide contains carboxyl groups ( Figure 3 ) [ 43 ]. The extraction of sacran from A. sacrum collected from numerous locations in Japan has generated a product that is physically similar to high-purity cotton [ 40 , 43 ].…”

Section: Aphanothece Sacrummentioning

confidence: 99%

The Use of Megamolecular Polysaccharide Sacran in Food and Biomedical Applications

et al. 2021

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Natural polymer is a frequently used polymer in various food applications and pharmaceutical formulations due to its benefits and its biocompatibility compared to synthetic polymers. One of the natural polymer groups (i.e., polysaccharide) does not only function as an additive in pharmaceutical preparations, but also as an active ingredient with pharmacological effects. In addition, several natural polymers offer potential distinct applications in gene delivery and genetic engineering. However, some of these polymers have drawbacks, such as their lack of water retention and elasticity. Sacran, one of the high-molecular-weight natural polysaccharides (megamolecular polysaccharides) derived from Aphanothece sacrum (A. sacrum), has good water retention and elasticity. Historically, sacran has been used as a dietary food. Moreover, sacran can be applied in biomedical fields as an active material, excipient, and genetic engineering material. This article discusses the characteristics, extraction, isolation procedures, and the use of sacran in food and biomedical applications.

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Optical second-harmonic images of sacran megamolecule aggregates

Cited by 9 publications

References 55 publications

Electric Field Effect on Optical Second-harmonic Generation of Amphoteric Megamolecule Aggregates

Electric Field Effect on Optical Second-harmonic Generation of Amphoteric Megamolecule Aggregates

The cyanobacterial polysaccharide sacran: characteristics, structures, and preparation of LC gels

The Use of Megamolecular Polysaccharide Sacran in Food and Biomedical Applications

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