CHRISTIANSBURG, Va. (January 6, 2015) – The new year ushered in a new standard in Certified Reference Materials (CRM) shelf life with the launch of Inorganic Ventures’ new Transpiration Control Technology (TCT) bag used to package all stock chemical standards resulting in a considerable extension in shelf life.
Transpiration refers to the passage of water vapor through the walls, or opening, of a container resulting in an increase of concentration. It’s a systematic error that becomes an issue when solutions are stored for long periods of time. For detailed information visit: inorganicventures.com/TCT.
"Our research focused on low-density polyethylene (LDPE) containers, and we tested the rate of transpiration based on bottle size and the circumference of the container opening," Inorganic Ventures, CEO and Senior Technical Director, Paul Gaines, Ph.D., said. "Our findings indicated that transpiration around the bottle opening is the dominant mechanism and we got to work finding a solution."
Other findings included:
- Smaller bottles transpire faster,
- Bottles that are half full and opened periodically have the highest transpiration rate,
- Opening the bottle periodically greatly increases transpiration,
- Heat-sealed shrink-wrapping around the bottle cap has no effect.
Recognizing the significant effects of transpiration, and the potential impact upon the shelf life of Certified Reference Materials (CRM), Inorganic Ventures researched ways to stop it.
"Possible approaches included refrigeration, which slows transpiration, and single-use sealed glass ampoules, which stop it," Gaines said. "Unfortunately, these solutions have limitations. Not all labs have access to refrigeration, and glass containers are not as clean as plastic, or as chemically resistant to certain types of acid."
After years of research, Inorganic Ventures is now able to successfully address the systematic error introduced by transpiration through heat-sealed aluminized bags that effectively stop transpiration when equilibrium is reached inside. CRMs stored using TCT have a shelf life that is limited only by chemical stability.
At no additional cost to customers, products sent in the new packaging will not expire until one year from the opening of the TCT bag, or upon lot expiration, whichever comes first. TCT eliminates concerns about storage, increasing concentration over time, and saving labs money.