Mimicking neuromelanin nanoparticles as a selective Pb2+ probe

Zhang, Shu; Xiao, Ming; Zhang, Yuqian; Yang, Li; Liu, Huan; Han, Gang; Rathi, Brijesh; Lyu, Kaiyu; Wu, Lidong

doi:10.1016/j.aca.2020.01.051

Cited by 16 publications

(8 citation statements)

References 42 publications

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“…showed that smaller sizes lead to stronger fluorescence, suggesting polydopamine's fluorescent property is likely related to some unknown quantum effect. [ 19 ] Quignard et al. obtained fluorescent dopamine core‐shell droplet by polymerization of dopamine at the oil/water interface.…”

Section: Melanin Structure and Optical Propertiesmentioning

confidence: 99%

“…Synthetic melanin has similar properties to natural melanin, such as high absorption of light and free radical quenching capability. [ 7 ] Synthetic eumelanin can be made from dopamine, [ 13,14 ] dopa, [ 15 ] DHI, [ 16 ] or DHICA; [ 17 ] synthetic pheomelanin can be made from a mixture of dopa and cysteine; [ 18 ] synthetic neuromelanin may be made from either a mixture of polydopamine and cysteine or a mixture of dopamine and lysine; [ 19,20 ] and finally, synthetic allomelanin can be made from DHN. [ 21 ] Synthetic melanin made from dopamine (polydopamine) is most easily prepared, with good control of the particle size, monodispersity, and ease of dispersal in solution.…”

Section: Melanin Structure and Optical Propertiesmentioning

confidence: 99%

“…Many experiments have shown that special treatments (i.e., chemical oxidation and degradation) of non‐fluorescent melanin particles may lead to small fluorescent nanoparticles ranging from tens of nanometers or even smaller, comparable to quantum dots. [ 19,37,38 ] A very recent review has comprehensively summarized diverse routes to make fluorescent polydopamine nanoparticles. [ 39 ] Here, we briefly review some key features of fluorescent melanin nanoparticles.…”

Section: Melanin Structure and Optical Propertiesmentioning

confidence: 99%

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Bioinspired Melanin‐Based Optically Active Materials

Xiao

Shawkey

Dhinojwala

2020

Advanced Optical Materials

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the properties and functions of melanin, the synthesis of melanin-like nanoparticles, and its versatile applications in catalysis, energy, and biomedical fields. Over the last 5 years, more than 1000 papers on melanin have been published annually, based on data from the Web of Science. Quite a few of these papers have reviewed melanin's chemical structure, physiochemical properties, and biomedical applications. [4-6] However, a critical review focusing on optical functions of melanin is still lacking, despite tremendous emerging work on melaninbased photonic materials. The purpose of this review is to summarize current advances in bioinspired melanin-based optically active materials. Specifically, we will cover inherent optical properties of melanin, and then summarize melanin's optical functions in nature and its optics-related applications. 2. Melanin Structure and Optical Properties Melanin has complex chemical structures that is not yet fully understood, however, it does not hinder the exploration of their optical properties. In this section, we will first discuss classifications of melanin and then summarize unique optical properties of melanin, which will be important for both understanding its biological function in nature and synthetic applications. 2.1. Classification and Structure Conventionally, all black pigments are called melanin. Recently, d'Ischia et al. suggested that any phenolic polymers that have broadband light absorption, antioxidant, and intrinsic free radical character should be characterized as melanin. [5] Exact chemical structures of melanin remain elusive, mainly due to their insolubility in solvents, close binding with other cellular tissues, and an amorphous structure. Here, we do not elaborate on the complexities of melanin's chemical structures, [7] but rather focus on its classification. Melanin can be categorized as either natural or synthetic depending on whether it was synthesized in vivo or in vitro. Both have similar macroscopic properties, but their structures are likely quite different. Natural melanin, including eumelanin, pheomelanin, and neuromelanin, is produced from a series of enzymatic reactions starting from L-tyrosine in biological systems (Figure 1). [1] In cells (commonly melanocytes), the tyrosinase oxidizes L-tyrosine to dopaquinone (DQ). If cysteine concentration in Melanin is a widespread multifunctional biological pigment that has emerged as a promising platform for applications in coating, catalysis, energy, drug delivery, and medical therapy. Melanin is also a compelling material for photonic applications because of its favorable material characteristics, including broadband absorption, high refractive index, tunable fluorescence, and UV blocking capabilities. However, there is not yet a critical review focusing on optical functions of melanin. This review summarizes current advances in bioinspired melanin-based optically active materials, covering melanin's inherent optical properties and functions both in nature and in optics-related applications. It is ...

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Section: Melanin Structure and Optical Propertiesmentioning

confidence: 99%

Section: Melanin Structure and Optical Propertiesmentioning

confidence: 99%

Section: Melanin Structure and Optical Propertiesmentioning

confidence: 99%

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Bioinspired Melanin‐Based Optically Active Materials

Xiao

Shawkey

Dhinojwala

2020

Advanced Optical Materials

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“…From this viewpoint, research focusing on the structure-function relationship between natural melanin and PDA is progressing [49]. Inspired by the functionality of natural melanin, PDA-based functional materials such as free radical scavengers [50], UV absorbers [51], metal ion probes [52], catalyst [53,54], and antioxidants [55] have been developed.…”

Section: Characteristics Of Polydopamine As a Melanin Mimetic Materialsmentioning

confidence: 99%

Progress in polydopamine-based melanin mimetic materials for structural color generation

Kohri

2020

Science and Technology of Advanced Materials

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Structural color is a color derived from optical interaction between light and a microstructure and is often seen in nature. Natural melanin plays an important role in bright structural coloration. For example, the vivid colors of peacock feathers are due to structural colors. The periodic arrangement of melanin granules inside the feathers leads to light interference, and the black granules absorb scattered light well, resulting in bright structural color. In recent years, polydopamine (PDA) has attracted attention as a melanin mimetic material. This review article summarizes recent research on structural coloration using PDAbased artificial melanin materials. It also outlines possible applications using bright structural colors realized by artificial melanin materials and future perspectives.

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“…For instance, Pb 2+ ion toxicity in the human body can result in cardiovascular diseases, neurological, reproductive, and developmental disorders, and mortality. [4] This circumstance is undoubtedly a matter of concern for present and future generations.…”

Section: Introductionmentioning

confidence: 99%

Biologically synthesized ZnS quantum dots as fluorescent probes for lead (II) sensing

2020

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This manuscript presents a robust strategy for selective Pb(II) sensing based on a fluorescence turn‐off mechanism using ZnS quantum dots (QDs) biosynthesized using Aspergillus sp. The biogenic nanoprobe displayed marked sensing efficiency in the presence of Pb ions over concentration ranges from 5 to 100 μM with limits of detection of around 2.45 μM. Performance optimization studies revealed that the maximum fluorescence quenching efficiency was obtained in the presence of [ZnS NPs] at 4 mg/ml, and alkaline pH of 10 recorded under stable ambient temperature for approximately 5 min for the quenching process. Advanced morphological analysis indicated that the bio‐sensing mechanism was essentially a surface‐based phenomenon in which the Pb ions were in very close proximity to the QDs and formed stable ground‐state Pb–ZnS complexes, resulting in a quenched fluorescence of the QDs. Simultaneously, a larger fraction of Pb ions interacted via collisions with the excited ZnS QDs and resulted in an effective energy transfer from the excited QDs to the Pb ions, therefore resulting in an obvious decrease in QD fluorescence. These insights were well supported by theoretical analysis using Stern–Volmer plots and sphere‐of‐action models.

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Mimicking neuromelanin nanoparticles as a selective Pb2+ probe

Cited by 16 publications

References 42 publications

Bioinspired Melanin‐Based Optically Active Materials

Bioinspired Melanin‐Based Optically Active Materials

Progress in polydopamine-based melanin mimetic materials for structural color generation

Biologically synthesized ZnS quantum dots as fluorescent probes for lead (II) sensing

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