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Visual and Optical Absorbance Detection of Melamine in Milk by Melamine-Induced Aggregation of Gold Nanoparticles.

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Title: Visual and Optical Absorbance Detection of Melamine in Milk by Melamine-Induced Aggregation of Gold Nanoparticles.
Authors: Siddiquee, Shafiquzzaman1 (AUTHOR) shafiqpab@ums.edu.my, Saallah, Suryani1 (AUTHOR) suryani@ums.edu.my, Bohari, Noor Aini1 (AUTHOR) gilbertringgit@gmail.com, Ringgit, Gilbert1 (AUTHOR), Roslan, Jumardi2 (AUTHOR) jumardi@ums.edu.my, Naher, Laila3 (AUTHOR) lailanaher@umk.edu.my, Hasan Nudin, Nur Fatihah4 (AUTHOR) fatihah@unisza.edu.my, Bartolomeo, Antonio Di (AUTHOR)
Source: Nanomaterials (2079-4991). May2021, Vol. 11 Issue 5, p1142. 1p.
Subjects: Melamine, Gold nanoparticles, Dried milk, Dairy products, Infant formulas, Light absorbance
Abstract: The present study reported a facile method for the determination of melamine in milk powder products based on the aggregation of reactant-free 5 nm gold nanoparticles (AuNPs). The strong electrostatic attraction between the positively charged exocyclic amine groups present in the melamine molecule and the negatively charged ions bound to the AuNPs induced aggregation of the AuNPs, resulting in visible color changes that could be seen with the naked eye and monitored by ultraviolet–visible (UV–Vis) absorbance spectra. The method shows high sensitivity with detection limits of 1 × 10−9 M for visual detection and 1 × 10−11 M for UV–Vis analysis, which is far below the safety limit of melamine ingestion in infant formula (1 ppm = 7.9 × 10−6 M) and the detection limit acquired by most AuNP-based melamine detection methods. Good recoveries were obtained over the range of 94.7–95.5% with a relative standard deviation of mean recovery (RSD) ranging from 1.40 to 5.81. The method provides a simple, feasible, fast and real-time detection of melamine adulterants in infant formula by the naked eye, without the aid of advanced instruments. [ABSTRACT FROM AUTHOR]
Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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  Data: Visual and Optical Absorbance Detection of Melamine in Milk by Melamine-Induced Aggregation of Gold Nanoparticles.
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  Data: <searchLink fieldCode="AR" term="%22Siddiquee%2C+Shafiquzzaman%22">Siddiquee, Shafiquzzaman</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> shafiqpab@ums.edu.my</i><br /><searchLink fieldCode="AR" term="%22Saallah%2C+Suryani%22">Saallah, Suryani</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> suryani@ums.edu.my</i><br /><searchLink fieldCode="AR" term="%22Bohari%2C+Noor+Aini%22">Bohari, Noor Aini</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> gilbertringgit@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Ringgit%2C+Gilbert%22">Ringgit, Gilbert</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Roslan%2C+Jumardi%22">Roslan, Jumardi</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> jumardi@ums.edu.my</i><br /><searchLink fieldCode="AR" term="%22Naher%2C+Laila%22">Naher, Laila</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> lailanaher@umk.edu.my</i><br /><searchLink fieldCode="AR" term="%22Hasan+Nudin%2C+Nur+Fatihah%22">Hasan Nudin, Nur Fatihah</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> fatihah@unisza.edu.my</i><br /><searchLink fieldCode="AR" term="%22Bartolomeo%2C+Antonio+Di%22">Bartolomeo, Antonio Di</searchLink> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Nanomaterials+%282079-4991%29%22">Nanomaterials (2079-4991)</searchLink>. May2021, Vol. 11 Issue 5, p1142. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Melamine%22">Melamine</searchLink><br /><searchLink fieldCode="DE" term="%22Gold+nanoparticles%22">Gold nanoparticles</searchLink><br /><searchLink fieldCode="DE" term="%22Dried+milk%22">Dried milk</searchLink><br /><searchLink fieldCode="DE" term="%22Dairy+products%22">Dairy products</searchLink><br /><searchLink fieldCode="DE" term="%22Infant+formulas%22">Infant formulas</searchLink><br /><searchLink fieldCode="DE" term="%22Light+absorbance%22">Light absorbance</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The present study reported a facile method for the determination of melamine in milk powder products based on the aggregation of reactant-free 5 nm gold nanoparticles (AuNPs). The strong electrostatic attraction between the positively charged exocyclic amine groups present in the melamine molecule and the negatively charged ions bound to the AuNPs induced aggregation of the AuNPs, resulting in visible color changes that could be seen with the naked eye and monitored by ultraviolet–visible (UV–Vis) absorbance spectra. The method shows high sensitivity with detection limits of 1 × 10−9 M for visual detection and 1 × 10−11 M for UV–Vis analysis, which is far below the safety limit of melamine ingestion in infant formula (1 ppm = 7.9 × 10−6 M) and the detection limit acquired by most AuNP-based melamine detection methods. Good recoveries were obtained over the range of 94.7–95.5% with a relative standard deviation of mean recovery (RSD) ranging from 1.40 to 5.81. The method provides a simple, feasible, fast and real-time detection of melamine adulterants in infant formula by the naked eye, without the aid of advanced instruments. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/nano11051142
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        Text: English
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        PageCount: 1
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      – SubjectFull: Melamine
        Type: general
      – SubjectFull: Gold nanoparticles
        Type: general
      – SubjectFull: Dried milk
        Type: general
      – SubjectFull: Dairy products
        Type: general
      – SubjectFull: Infant formulas
        Type: general
      – SubjectFull: Light absorbance
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    Titles:
      – TitleFull: Visual and Optical Absorbance Detection of Melamine in Milk by Melamine-Induced Aggregation of Gold Nanoparticles.
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            – D: 01
              M: 05
              Text: May2021
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              Y: 2021
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