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HOT Article: Using ELISA to test for Para red in foods

29 Mar 2012

A highly selective and sensitive enzyme-linked immunosorbent assay (ELISA) for the determination of the synthetic dye Para red in foodstuffs has been developed by Ting Xu, from the China Agriculture University, and colleagues. Para red is a dye that is used in printing, and is prohibited in foodstuffs due to it being a potential genotoxic carcinogen. The assay was tested on real food, and was comparable to current methods which are more resource intensive.

A sensitive and selective enzyme-linked immunosorbent assay for the analysis of para red in foods
Jia Wang, Keyi Wei, Hao Li, Qing X. Li, Ji Li and Ting Xu
Analyst , 2012, Advance Article
DOI : 10.1039/C2AN35127G

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HOT Article: Making a biomimetic artificial nose

29 Mar 2012

Youngkyoo Kim from the Kyungpook National University, Republic of Korea, and colleagues have developed an artificial nose that can mimic the real thing! Olfactory sensory neurons from rats were cultured onto indium-tin oxide electrodes and direct voltage and current signals were then measured when it was exposed to odorants. It is hoped the present system can help advance the work in biomimetic artificial noses, which have a number of applications in medical diagnosis, anti-bioterror devices and environmental monitoring.

Direct measurement of extracellular electrical signals from mammalian olfactory sensory neurons in planar triode devices
Hwajeong Kim, So Yeun Kim, Sungho Nam, Gabriele V. Ronnett, Hyung Soo Han, Cheil Moon and Youngkyoo Kim
Analyst , 2012, Advance Article
DOI : 10.1039/C2AN16205A

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Picturing bacteria on your phone

08 Mar 2012

Using cell phone to detect E. coli contamination in liquids

The device, which is attached to a cell phone, detects E. coli and the phone's camera is used to capture light emission images © Ozcan Research Lab at UCLA

US scientists have developed a device that, when attached to a mobile phone, can detect small amounts of Escherichia coli in liquid samples.

Outbreaks of E. coli poisoning still pose a threat to health, particularly in developing countries. As few as ten E. coli bacteria can cause serious ill health, so accurate and efficient detection devices are required to identify contaminated food and water. Existing detection devices are often expensive, complex and require large equipment unsuitable for field use.

There are over five billion mobile phones in the world and over 70% of these are in developing areas. Hongying Zhu and colleagues at the University of California, Los Angeles, developed a device able to take advantage of this abundant technology. Zhu commented that ‘our cell phone based platform would be very useful to bring advanced technologies to remote and resource poor locations’ adding that the phone provides ‘a ubiquitous platform for conducting advanced micro-analysis wherever cell phones work’.

Read the full story in Chemistry World

Link to journal article:

Quantum dot enabled detection of Escherichia coli using a cell-phone
Hongying Zhu, Uzair Sikora and Aydogan Ozcan
Analyst, 2012, Advance Article
DOI: 10.1039/C2AN35071H

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Intelligent packaging to detect spoiled food

16 Nov 2011

Photographs of pork, packaged along with an oxygen smart plastic film. The package was sealed in the absence of oxygen (a) and the indicator activated (b). The lid was then broken and lifted back, and photographed immediately (c), after 1 day (d), 2 days (e) and 4 days (f) in a fridge at 5 degrees Celsius

A sensor that changes colour in the presence of oxygen could be useful in the food packaging industry, according to its UK inventors. The sensor turns blue in excess oxygen, indicating to the consumer that the food should be thrown away.

Interested to know more? Read the full article in Chemistry World here…

Read the paper in full:

An O₂ smart plastic film for packaging
A Mills, K Lawrie, J Bardin, A Apedaile, G A Skinner and C O’Rourke
Analyst, 2011,
DOI: 10.1039/c1an15774d

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HOT Article: Using ELISA to test for Para red in foods

HOT Article: Making a biomimetic artificial nose

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Picturing bacteria on your phone

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Intelligent packaging to detect spoiled food

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