Featured Research

from universities, journals, and other organizations

Lab In A Drop: Pocket-sized PCR Rapid Test Including Sample Preparation

Date:
May 7, 2008
Source:
Wiley-Blackwell
Summary:
Jürgen Pipper and his team at the Institute of Bioengineering and Nanotechnology in Singapore have developed a rapid test for genetic diagnosis that combines the preparation of biological samples with a polymerase chain reaction on one chip.

Analysis and diagnosis in a chip format are coming of age, but their practical application has been limited because until now, the sample usually had to be prepared separately and on a nonminiaturized scale.
Credit: Copyright Wiley-VCH

Analysis and diagnosis in a chip format are coming of age, but their practical application has been limited because until now, the sample usually had to be prepared separately and on a nonminiaturized scale. Jürgen Pipper and his team at the Institute of Bioengineering and Nanotechnology in Singapore want to change this. They have now developed a rapid test for genetic diagnosis that combines the preparation of biological samples with a polymerase chain reaction (PCR) on one chip. As they report in the journal Angewandte Chemie, the “laboratory device” for all steps in this system is a single drop containing magnetic nanoparticles, which is moved across the chip by a magnetic field.

Related Articles


PCR allows gene sequences to be duplicated and identified—to identify a disease trigger, for example. In this process, the sample must cycle through a specific sequence of temperatures. Because of the slow heating and cooling processes, laboratory PCR usually takes several hours. The new chip PCR requires only minutes, including for the sample preparation.

In contrast to other chip-based methods, the actual sample, such as a drop of blood, can be placed directly on the PCR chip, where it is mixed with a drop that contains magnetic particles. These particles are equipped with antibodies on their surface, antibodies that bind specifically to the interesting cells in the blood. By moving a magnet underneath the chip, a droplet containing the bound magnetic particles is physically pulled out of the blood droplet and moved on to the next station—a droplet of washing liquid. The magnetic droplet is combined with the washing droplet and then pulled out again through movement of the magnet. Another droplet then delivers the enzymes and reagents necessary for cell disruption.

The last station is the PCR station. After combination with a reagent droplet, the magnetic droplet is moved around like a clockwork, passing again and again through four different zones set to the temperatures necessary for PCR. Each cycle lasts 8 seconds. A fluorescence detector over one of the zones monitors the progress of the PCR (real-time PCR) and indicates whether the desired gene sequence is present and in what amount.

With their new PCR chip, the researchers were able to isolate 30 cells implanted with the genetic information for a green-fluorescing protein from 25 µL of blood, concentrate them 100-fold, wash them, rupture them, and detect the gene for the green protein by real-time PCR—all within just 17 minutes!


Story Source:

The above story is based on materials provided by Wiley-Blackwell. Note: Materials may be edited for content and length.


Journal Reference:

  1. Juergen Pipper, Yi Zhang, Pavel Neuzil, Tseng-Ming Hsieh. Clockwork PCR Including Sample Preparation. Angewandte Chemie International Edition, 2008; 47 (21): 3900 DOI: 10.1002/anie.200705016

Cite This Page:

Wiley-Blackwell. "Lab In A Drop: Pocket-sized PCR Rapid Test Including Sample Preparation." ScienceDaily. ScienceDaily, 7 May 2008. <www.sciencedaily.com/releases/2008/05/080506120940.htm>.
Wiley-Blackwell. (2008, May 7). Lab In A Drop: Pocket-sized PCR Rapid Test Including Sample Preparation. ScienceDaily. Retrieved April 19, 2015 from www.sciencedaily.com/releases/2008/05/080506120940.htm
Wiley-Blackwell. "Lab In A Drop: Pocket-sized PCR Rapid Test Including Sample Preparation." ScienceDaily. www.sciencedaily.com/releases/2008/05/080506120940.htm (accessed April 19, 2015).

Share This


More From ScienceDaily



More Health & Medicine News

Sunday, April 19, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Our Love Of Puppy Dog Eyes Explained By Science

Our Love Of Puppy Dog Eyes Explained By Science

Newsy (Apr. 17, 2015) — Researchers found a spike in oxytocin occurs in both humans and dogs when they gaze into each other&apos;s eyes. Video provided by Newsy
Powered by NewsLook.com
Dr. Oz Under Fire For 'Quack Treatments' Yet Again

Dr. Oz Under Fire For 'Quack Treatments' Yet Again

Newsy (Apr. 17, 2015) — Ten doctors signed a letter urging Columbia University to drop Dr. Oz as vice chair of its department of surgery, saying he plugs "quack" treatments. Video provided by Newsy
Powered by NewsLook.com
Scientists Find Link Between Gestational Diabetes And Autism

Scientists Find Link Between Gestational Diabetes And Autism

Newsy (Apr. 17, 2015) — Researchers who analyzed data from over 300,000 kids and their mothers say they&apos;ve found a link between gestational diabetes and autism. Video provided by Newsy
Powered by NewsLook.com
Video Messages Help Reassure Dementia Patients

Video Messages Help Reassure Dementia Patients

AP (Apr. 17, 2015) — Family members are prerecording messages as part of a unique pilot program at the Hebrew Home in New York. The videos are trying to help victims of Alzheimer&apos;s disease and other forms of dementia break through the morning fog of forgetfulness. (April 17) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Health & Medicine

Mind & Brain

Living & Well

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins