Method and device for marking articles
Provided are a method and device for marking an article for security, tracking or authentication. The method includes depositing a solution comprising a nucleic acid marker onto at least a portion of the article. The nucleic acid marker may be activated, for example, by adding a functional group to the nucleic acid marker. The activation of the nucleic acid marker may be performed by exposure to alkaline conditions. The method is well suited for marking fibers and textiles, as well as many other items.
1. A method of marking raw cotton fibers with a nucleic acid molecular marker, the method comprising:
reducing a water content of raw cotton before ginning to approximately 6.5 percent w/w;
ginning the raw cotton to remove cotton fibers from plant material to create raw cotton fibers;
during ginning the raw cotton, depositing approximately two percent w/w of a liquid solution comprising a nucleic acid molecular marker and water onto the raw cotton fibers via misted spray of the liquid solution.
2. The method as defined in claim 1 , wherein the liquid solution includes an alkaline activator and the molecular marker is a nucleic acid molecular marker and the activator aids in bonding of the nucleic acid molecular marker to the raw cotton fibers.
3. The method as defined in claim 2 , wherein the alkaline activator includes a solution of a hydroxide of an alkali metal and the alkali metal is selected from the group consisting of lithium (Li), sodium (Na), rubidium (Rb), and cesium (Cs).
4. The method as defined in claim 1 , including
the depositing of the nucleic acid molecular marker being performed with a delivery mechanism comprising one or more outlets, wherein the nucleic acid molecular marker comprises alkaline activated DNA, the alkaline activated DNA being produced by exposing the DNA to a solution of an alkali metal hydroxide having a concentration from about 0.001 M to about 1.0 M; and
thereby marking the raw cotton fibers with the nucleic acid molecular marker, wherein the nucleic acid molecular marker is covalently bonded to the raw cotton fibers.
5. The method of as defined in claim 4 , wherein an amount of the solution comprising the nucleic acid molecular marker deposited on the article is regulated by a metering control.