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Grolltex Joins Fight Against Pandemic

Posted By Graphene Council, Monday, April 20, 2020
As researchers and companies around the world set out to battle the Coronavirus pandemic, many are revisiting graphene as a material with potential for helping to win this fight.

Grolltex Inc., a San Diego area biosensor startup that manufactures graphene has partnered up with Sanford Burnham Prebys Medical Discovery Institute to develop a virus testing platform to help combat COVID-19.

The project involves using hand held reader units and disposable plastic testing chips designed for U.S. points of entry including, hospitals and “point of care” locations.

Jumping on the Project
Founded in 2017, Jeff Draa, co-founder and CEO of Grolltex said, “When we saw the COVID-19 virus detection work come out in the literature, showing sensitive and selective detection with a graphene sensor, we knew we had to jump on this project.”

Earlier this month, a team led by Boston College researchers used a sheet of graphene to track the electronic signals inherent in biological structures, to develop a platform to selectively identify deadly strains of bacteria.

Most interestingly, graphene sensors have been shown for several years to be capable of advanced detection and testing in fields such as genomics, small molecule-protein receptor interactions and advanced allergen sensing as well as virus detection, including Zika.

Graphene–Based Sensor
The new scientific findings also show a robust capability for a graphene-based sensor to detect the COVID-19 virus.

“Productization and roll out of a sensor like this is right in our technology wheelhouse. We’re very thankful for the quick response of the folks at Sanford Burnham with their help on the science and testing. It would take many more months, maybe even years, without them,” Draa said.

The company which spun out of UC San Diego has raised a total of $2.2 million from Tech Coast Angels, UC San Diego’s Triton Technology Fund, among other local investors.

Over the past three years, Grolltex primarily sold raw research materials to labs across the globe and eventually pivoted to servicing biosensors giants including a publicly-traded pharmaceutical company and another pharmaceutical organization based in Japan. Names were not disclosed.

As for the project, the “graphene sensor chip on plastic” platform uses a very small biological sample and can perform up to 4 to 12 viral tests, all at one time. As a result, this information may indicate the presence of having a normal flu symptoms versus serious pathogens, including the novel coronavirus.

In addition, its technology is plumbed with a number of control channels which eliminates time-consuming verification steps and helping to provide answers in minutes.

Can Be Made for Pennies
In terms of cost, using the Grolltex industrial-scale graphene manufacturing platform, sensing chips can be made for pennies and in arrays of about 10,000 per single square foot sheet, 100 sheets at a time, according to the company.

In particular, the sensor employs monolayer graphene, a single atom thick layer material. On top of the graphene, the company places additional proprietary and patented nanotechnology, including a unique sensing capability made of “gold nano-islands.”

As of today, the small startup lacks the bandwidth to roll its virus detection platform out following the completion of the science. Draa said, what lies ahead for the startup is to find a local financial partner to help scale its testing platform.

“We currently have our hands full with several prototyping efforts in place in other areas, ranging from glucose detection in saliva to a wearable blood pressure monitor in a patch configuration. But when the Sanford Burnham folks volunteered the science help on this COVID virus detection platform, we knew we had to jump on it”, said Draa, “We’re still a small start-up so we’re looking for a financial or resource partner to help us get this up to volume and in the right hands. We know we’re in one of the best locations in the U.S. for an effort like this so once we make the partnering connections, the ramp will be fast.”

Tags:  Boston College  Graphene  Groltex  Healthcare  Jeff Draa  Sensors 

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Grolltex Graphene Closes Oversubscribed Private Placement Financing Round

Posted By Graphene Council, Wednesday, September 11, 2019
Updated: Tuesday, September 10, 2019

Grolltex (named for ‘graphene-rolling-technologies’) is the largest commercial producer of single layer, ‘electronics grade’ graphene and graphene sensing materials in the U.S. They have announced that it has closed a non-brokered, oversubscribed private placement financing, in the form of a convertible note, with local area private investors. 

The gross proceeds of the private placement will be used for general working capital purposes and for increasing the capacity and quality testing capabilities of the company’s production facility in San Diego, California.


The company is focused on delivering inexpensive and enabling solutions to advanced nano-device and graphene sensor makers by fabricating the highest quality single layer graphene attainable, via chemical vapor deposition (or ‘CVD’).

The company is now capable of producing monolayer graphene sensors on large area plastic sheets at a cost of pennies per unit, in a high throughput and sustainable way.  Further, Grolltex is helping customers that currently produce their graphene sensors on silicon wafers, to transition that production capacity to making their sensors on large area sheets of biodegradable plastic instead, at a >100X cost savings. 

Monolayer graphene films are today seen as the most promising futuristic sensing materials for their combination of surface to volume ratio (the film is only one atom thick) and conductivity (the most conductive substance known at room temperature). Markets that are commercializing advanced sensors made of graphene include DNA sensing and editing, new drug discovery and wearable bio-monitors for glucose sensing and autonomous blood pressure monitoring via patches or watch-like wearable bracelet devices.

No securities were issued and no cash was paid as bonuses, finders’ fees, compensation or commissions in connection with the private placement.

Tags:  Biosensor  CVD  Graphene  Groltex  Sensors 

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