Hydrogen-bonding-induced colorimetric detection of melamine by nonaggregation-based Au-NPs as a probe

Cao, Qian; Zhao, Hong; He, Yi; Li, Xiangjun; Zeng, Lixi; Ding, Nan; Wang, Jian; Yang, Jie; Wang, Guangwei

doi:10.1016/j.bios.2010.04.046

Cited by 94 publications

(31 citation statements)

References 41 publications

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“…For example, Li and his group synthesized glutathione-stabilized silver nanoparticles as colorimetric sensors for nickel ion [21] and aza-crown ether-modified silver nanoparticles as colorimetric sensors for Ba 2+ [22]. Huang and his group reported polythyminestabilized gold nanoparticles for the recognition of melamine [23]. Takarda and his group developed doublestranded DNA-carrying gold nanoparticles for detection of mercury ion [24].…”

Section: Introductionmentioning

confidence: 98%

Colorimetric detection of lead (II) based on silver nanoparticles capped with iminodiacetic acid

Shang

2012

Microchim Acta

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We report on a colorimetric probe for the determination of Pb(II). It is based on the use of silver nanoparticles that have been functionalizd with iminodiacetic acid (IDA-Ag NPs). The absorption spectrum and solution color of IDA-Ag NPs undergo dramatic changes on exposure to Pb(II) with a new absorption peak appearing at 650 nm and a concomitant color change from yellow to green. This is assumed to result from the aggregation of IDA-Ag NPs induced by Pb(II). Under optimum conditions, there is a linear relationship between the ratio of the absorbances at 650 and 396 nm, respectively, and the concentration of Pb(II) in the 0.4 to 8.0 μM concentration range, with a detection limit of 13 nM. The method was applied to the determination of Pb(II) in tap water and urea samples, and recoveries ranged from 93.7 % to 98.6 %.

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Section: Introductionmentioning

confidence: 98%

Colorimetric detection of lead (II) based on silver nanoparticles capped with iminodiacetic acid

Shang

2012

Microchim Acta

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“…Melamine in milk products could be detected by visual and light scattering spectrometric methods with polythymine-stabilized Au NPs on the basis of the formation of triple H-bonds between thymine and melamine in aqueous solution (Qi, Wu, Ling, & Huang, 2010). Colorimetric and nonaggregationbased gold nanoparticles probe has been developed for the detection of melamine in which the synthesis of Au NPs was hindered (Cao et al, 2010) or accelerated (Wu et al, 2011) by the presence of melamine. In other reports, simple colorimetric methods base on electrostatic interactions between melamine and citrate-capped Au NPs (Chi, Liu, Guan, Zhang, & Han, 2010;Li, Li, Cheng, & Mao, 2010;Qin, Zhao, Huang, & Wu, 2009;Wei et al, 2010& Guo et al, 2010 and cysteamine-modified Au NPs (Liang et al, 2011) have been exploited for the detection of melamine.…”

Section: Introductionmentioning

confidence: 99%

Visual detection of melamine in raw milk by label-free silver nanoparticles

et al. 2012

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“…The authors claim that this nanosensor can be used to precisely measure the melamine content in infant formula and raw milk at concentrations of 2.5 ppb with no more than the naked eye (Ai et al 2009). Other approaches to the detection of melamine with gold nanoparticles with different modifications have been described by Cao et al (2010) and Kuang et al (2011) with slightly higher detection limits.…”

Section: Detection Of Other Organic Moleculesmentioning

confidence: 99%

Nano-developments for Food Packaging and Labeling Applications

Echegoyen

2015

Nanotechnologies in Food and Agriculture

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Nanotechnology is defined as the study and use of structures between 1 and 100 nm in length (at least in one dimension). Due to the different properties of nanosized materials compared to the bulk material, research in nanotechnology has increased exponentially in recent years. The food sector is no exception, and nanotechnology is present in different stages of the food chain, from agriculture to food processing, supplements, or food packaging. Among them, the most active area of food nanoscience research and development is food packaging.Nanomaterials are used in packaging to improve the packaging barrier properties, to create active or intelligent packaging materials, or to enhance the properties of edible and biodegradable packaging materials. In addition to the packages itself, nanotechnology can also be used in labeling applications, like a nano-barcode. In the present chapter, all these applications and the commercialized products already in the market will be discussed.The current legislation related to nano-developments in food packaging is at different stages in different countries, and there are concerns about the safety of the use of such nanosized materials for food packaging applications. The different studies concerning the possible migration of the nanomaterials used in the packaging to the food will be reviewed.

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Hydrogen-bonding-induced colorimetric detection of melamine by nonaggregation-based Au-NPs as a probe

Cited by 94 publications

References 41 publications

Colorimetric detection of lead (II) based on silver nanoparticles capped with iminodiacetic acid

Colorimetric detection of lead (II) based on silver nanoparticles capped with iminodiacetic acid

Visual detection of melamine in raw milk by label-free silver nanoparticles

Nano-developments for Food Packaging and Labeling Applications

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