Mass-Sensitive Sensing of Melamine in Dairy Products with Molecularly Imprinted Polymers: Matrix Challenges
Food standards and quality control are important means to ensure public health. In the last decade, melamine has become a rather notorious example of food adulteration: Spiking products with low-cost melamine in order to feign high amino acid content exploits the lack in specificity of the establish...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-05-01
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| Series: | Sensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1424-8220/19/10/2366 |
| _version_ | 1798034628573921280 |
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| author | Martin Zeilinger Hermann Sussitz Wim Cuypers Christoph Jungmann Peter Lieberzeit |
| author_facet | Martin Zeilinger Hermann Sussitz Wim Cuypers Christoph Jungmann Peter Lieberzeit |
| author_sort | Martin Zeilinger |
| collection | DOAJ |
| description | Food standards and quality control are important means to ensure public health. In the last decade, melamine has become a rather notorious example of food adulteration: Spiking products with low-cost melamine in order to feign high amino acid content exploits the lack in specificity of the established Kjeldahl method for determining organic nitrogen. This work discusses the responses of a sensor based on quartz crystal microbalances (QCM) coated with molecularly imprinted polymers (MIP) to detect melamine in real life matrices both in a selective and a sensitive manner. Experiments in pure milk revealed no significant sensor responses. However, sensor response increased to a frequency change of −30Hz after diluting the matrix ten times. Systematic evaluation of this effect by experiments in melamine solutions containing bovine serum albumin (BSA) and casein revealed that proteins noticeably influence sensor results. The signal of melamine in water (1600 mg/L) decreases to half of its initial value, if either 1% BSA or casein are present. Higher protein concentrations decrease sensor responses even further. This suggests significant interaction between the analyte and proteins in general. Follow-up experiments revealed that centrifugation of tagged serum samples results in a significant loss of sensor response, thereby further confirming the suspected interaction between protein and melamine. |
| first_indexed | 2024-04-11T20:46:51Z |
| format | Article |
| id | doaj.art-19cc88da82a44f67996f3eebbff6bea7 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T20:46:51Z |
| publishDate | 2019-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-19cc88da82a44f67996f3eebbff6bea72022-12-22T04:03:59ZengMDPI AGSensors1424-82202019-05-011910236610.3390/s19102366s19102366Mass-Sensitive Sensing of Melamine in Dairy Products with Molecularly Imprinted Polymers: Matrix ChallengesMartin Zeilinger0Hermann Sussitz1Wim Cuypers2Christoph Jungmann3Peter Lieberzeit4University of Vienna, Faculty of Chemistry, Department of Physical Chemistry, Währinger Straße 42, Vienna 1090, AustriaUniversity of Vienna, Faculty of Chemistry, Department of Physical Chemistry, Währinger Straße 42, Vienna 1090, AustriaUniversity of Vienna, Faculty of Chemistry, Department of Physical Chemistry, Währinger Straße 42, Vienna 1090, AustriaUniversity of Vienna, Faculty of Chemistry, Department of Physical Chemistry, Währinger Straße 42, Vienna 1090, AustriaUniversity of Vienna, Faculty of Chemistry, Department of Physical Chemistry, Währinger Straße 42, Vienna 1090, AustriaFood standards and quality control are important means to ensure public health. In the last decade, melamine has become a rather notorious example of food adulteration: Spiking products with low-cost melamine in order to feign high amino acid content exploits the lack in specificity of the established Kjeldahl method for determining organic nitrogen. This work discusses the responses of a sensor based on quartz crystal microbalances (QCM) coated with molecularly imprinted polymers (MIP) to detect melamine in real life matrices both in a selective and a sensitive manner. Experiments in pure milk revealed no significant sensor responses. However, sensor response increased to a frequency change of −30Hz after diluting the matrix ten times. Systematic evaluation of this effect by experiments in melamine solutions containing bovine serum albumin (BSA) and casein revealed that proteins noticeably influence sensor results. The signal of melamine in water (1600 mg/L) decreases to half of its initial value, if either 1% BSA or casein are present. Higher protein concentrations decrease sensor responses even further. This suggests significant interaction between the analyte and proteins in general. Follow-up experiments revealed that centrifugation of tagged serum samples results in a significant loss of sensor response, thereby further confirming the suspected interaction between protein and melamine.https://www.mdpi.com/1424-8220/19/10/2366melamineproteinbovine serum albumin (BSA)molecularly imprinted polymers (MIP)quartz crystal microbalances (QCM) |
| spellingShingle | Martin Zeilinger Hermann Sussitz Wim Cuypers Christoph Jungmann Peter Lieberzeit Mass-Sensitive Sensing of Melamine in Dairy Products with Molecularly Imprinted Polymers: Matrix Challenges Sensors melamine protein bovine serum albumin (BSA) molecularly imprinted polymers (MIP) quartz crystal microbalances (QCM) |
| title | Mass-Sensitive Sensing of Melamine in Dairy Products with Molecularly Imprinted Polymers: Matrix Challenges |
| title_full | Mass-Sensitive Sensing of Melamine in Dairy Products with Molecularly Imprinted Polymers: Matrix Challenges |
| title_fullStr | Mass-Sensitive Sensing of Melamine in Dairy Products with Molecularly Imprinted Polymers: Matrix Challenges |
| title_full_unstemmed | Mass-Sensitive Sensing of Melamine in Dairy Products with Molecularly Imprinted Polymers: Matrix Challenges |
| title_short | Mass-Sensitive Sensing of Melamine in Dairy Products with Molecularly Imprinted Polymers: Matrix Challenges |
| title_sort | mass sensitive sensing of melamine in dairy products with molecularly imprinted polymers matrix challenges |
| topic | melamine protein bovine serum albumin (BSA) molecularly imprinted polymers (MIP) quartz crystal microbalances (QCM) |
| url | https://www.mdpi.com/1424-8220/19/10/2366 |
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