Controllable self-assemblies of sodium benzoate in different solvent environments

Ma, Mingfang; Gu, Jinge; Yang, Minmin; Li, Zhaolou; Lu, Zhuoqun; Zhang, Yimeng; Xing, Peng; Li, Shangyang; Chu, Xiaoxiao; Wang, Yajie; Li, Qi; Lin, Minyan; Hao, Aiyou

doi:10.1039/c5ra13026c

Cited by 7 publications

(6 citation statements)

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“…This finding confirms the π−π stacking interaction between the hydrophobic aromatic regions of GO and that of TA along with hydrogen bond formation (H-type π−π stacking molecular model). 18 Thus, TA can attached to rGO surface, leading to modification of surface for enzyme immobilization.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Tannic Acid-Reduced Graphene Oxide Deposited with Pt Nanoparticles for Switchable Bioelectronics and Biosensors Based on Direct Electrochemistry

Akkaya

Çakıroğlu

Özacar

2018

ACS Sustainable Chem. Eng.

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In this study, we reported a novel biosensor based on direct electrochemistry of glucose oxidase (GOx) on a tannic acid-reduced graphene oxide nanocomposite modified glassy carbon electrode deposited with Pt nanoparticles. Tannic acid (TA) was utilized for the simultaneous green reduction of Pt 4+ and graphene oxide (GO), along with modifying the reduced GO for the GOx immobilization, thus constructing a switchable surface with pH and temperature alterations. Upon the electrochemically oxidation of TA to quinone, enhanced electron transfer was obtained, and a third generation biosensor was fabricated using π−π interaction between GO and TA and Schiff-base assisted hydrogen bonds between GOx and TA interactions. The redox peaks were observed at a formal potential of −0.462 V with a peak separation (ΔE p ) of 56 mV, which reveals the fast electron transfer. The linear response to glucose oxidation was in the range of 2−10 mM with a limit of detection of 1.21 μM and a sensitivity of 27.51 μA mM −1 cm −2 . Upon the deposition of poly(Nisopropylacrylamide) (PNIPAAm) onto the constructed biosensor via hydrogen bonds, an on−off biosensor was fabricated with zipperlike interfacial properties upon the formation of the shrunken and compact globule PNIPAAm structure and varying surface charge. Therefore, this study confirmed the versatile aspects of natural TA without using complicated methods.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Tannic Acid-Reduced Graphene Oxide Deposited with Pt Nanoparticles for Switchable Bioelectronics and Biosensors Based on Direct Electrochemistry

Akkaya

Çakıroğlu

Özacar

2018

ACS Sustainable Chem. Eng.

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“…45,46 Furthermore, the peaks of ν N−H and ν O−H in the OPGG gel become broader and stronger than those in the OPGG powders, which can also imply the formation of Hbonding in OPGG gel. 47 Figure 2b displays the UV−vis spectra comparison of OPGG in DMSO and OPGG gel. The OPGG molecules in DMSO should be in a state of single molecule for good solubility.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The main absorption peak of OPGG in DMSO is 241 nm, which exhibits an obvious blueshift to 230 nm in the OPGG gel, indicating the formation of a H-type π−π stacking molecular model. 47,48 Hence, Hbonding and π−π stacking may be the driving forces for the construction of the OPGG gel. To further explore the microstructures of molecular packing, we employed SAXS, which was often used to identify the structures of soft materials.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…As shown in Figure a, peaks of ν N–H = 3489 cm –1 and ν O–H = 3350 cm –1 in OPGG shift to 3431 and 3334 cm –1 in xerogel, as well as the peak of ν CN = 1665 cm –1 , ν CO = 1613 cm –1 , and δ N–H = 1532 cm –1 shift to 1653, 1595, and 1520 cm –1 , respectively. The lower wavelength shift indicates that intermolecular hydrogen bonds are formed in the OPGG gel. , Furthermore, the peaks of ν N–H and ν O–H in the OPGG gel become broader and stronger than those in the OPGG powders, which can also imply the formation of H-bonding in OPGG gel Figure b displays the UV–vis spectra comparison of OPGG in DMSO and OPGG gel.…”

Section: Results and Discussionmentioning

confidence: 99%

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pH-Responsive Dipeptide-Based Dynamic Covalent Chemistry Systems Whose Products and Self-Assemblies Depend on the Structure of Isomeric Aromatic Dialdehydes

Wang

Xing

et al. 2018

Langmuir

Self Cite

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Facile control over preparation of organic building blocks and self-assembled aggregations to construct the desired materials remains challenges. This article reports selective dynamic covalent bonds formation and the corresponding self-assembly behaviors by using a dipeptide, glycylglycine (GlyGly), reacting with isomeric aromatic dialdehydes o-phthalaldehyde (OPA), p-phthalaldehyde (PPA), and m-phthalaldehyde (MPA) to demonstrate diversified aggregation forms caused by structure topology variations. Under alkaline condition, the aldehyde groups of phthalaldehydes can be connected with the amino groups of GlyGly by imine bonds as the dynamic chemical bonds. Owing to the fact that formation and dissociation of the imine bonds were reversibly pH-responsive, the reactions and aggregates assembled by their products were also reversibly controlled by changing pH. Three products, including two-armed product (OPGG, in which two GlyGly molecules were connected with one OPA molecule), single-armed product (PPG, in which only one GlyGly molecule was connected with a PPA molecule), and a mixture product (MPGG and MPG), as well as their different self-assembly behaviors, were obtained from OPA/GlyGly, PPA/GlyGly, and MPA/GlyGly systems, respectively, at the same condition of pH 8.6 in 90% methanol aqueous solution. However, for OPA/GlyGly system, another different type of product with benzopyrrole structure (OPG) was obtained by nucleophilic substitution via mixing OPA and GlyGly in water, which generated organic nanoparticles. Based on the results above, we conjectured the differences in dynamic covalent bond formation and supramolecular assembly clearly were influenced by the structure topologies of phthalaldehydes (OPA, PPA, and MPA). The experimental phenomenon verified the hypothesis as well, which may guide us to realize facile construction of selective reaction products and intelligent reversibly responsive materials with diverse morphologies and functions.

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“…Likewise, CNTs, which were first discovered in 1991 by Sumio Iijima et al [13], are the most important nanostructured materials in the recent decades because of their unique mechanical and electrical characteristics contrast to additional carbon allotropy due to its one-dimensional structure and few nanometers diameter [12].…”

Section: Introductionmentioning

confidence: 99%

Graphene-based Materials and their Nanocomposites with Metal Oxides: Biosynthesis, Electrochemical, Photocatalytic and Antimicrobial Applications

2020

Magnetic Oxides and Composites II

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Metal oxides and their nanocomposites are used in various technological applications. Biofabrication of carbon-based metal oxide nanocomposites preparation using plants, microbes, cell cultures and enzymes are the most attractive technique because of nontoxic nature, and sustainable process. Phytochemicals play important role in size lessening of the particles by performing as structure-directing, capping and reducing agents. In this chapter, we shed light on eco-friendly, money-spinning, and phytosynthesis of carbon based nanomaterials (CNMs) like graphene oxide, reduced graphene oxide, and metal doped-rGO nanocomposites using green reducers. Moreover, electrochemical, photocatalytical and biological applications of CNMs and their nanocomposites with metal oxides are discussed.

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Controllable self-assemblies of sodium benzoate in different solvent environments

Abstract: Sodium benzoate is an important and widely used food additive, however, it's self-assembly properties in diverse solvents have been rarely studied. Here, we systematically report its various self-assemblies in different solvents environments.

Cited by 7 publications

References 50 publications

Tannic Acid-Reduced Graphene Oxide Deposited with Pt Nanoparticles for Switchable Bioelectronics and Biosensors Based on Direct Electrochemistry

Tannic Acid-Reduced Graphene Oxide Deposited with Pt Nanoparticles for Switchable Bioelectronics and Biosensors Based on Direct Electrochemistry

pH-Responsive Dipeptide-Based Dynamic Covalent Chemistry Systems Whose Products and Self-Assemblies Depend on the Structure of Isomeric Aromatic Dialdehydes

Graphene-based Materials and their Nanocomposites with Metal Oxides: Biosynthesis, Electrochemical, Photocatalytic and Antimicrobial Applications

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