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Archive for September, 2011

ANTIBACTERIAL PROFICIENCY TRIAL RESULTS SUPPORT ISO/IEC 17025 CAPABILITY FOR AATCC 147 AND AATCC 100

Vartest has successfully completed participation in AATCC Proficiency Trials in support of ongoing ISO/IEC 17025 Accreditation for AATCC Test Methods 147 and 100. Additionally elemental analysis via wet chemistry/spectroscopy and energy dispersive xray are available in order to measure the presence and establish the location of elements such as silver which are associated with a particular anti bacterial finish.

Both leaching and nonleaching finishes can be assessed.

Biosafety Level 2 Testing At Vartest

 

Antibacterial testing is often one component of a battery of tests that Vartest performs to fully characterize a textile product. Both leaching and non leaching finishes can be assessed and Vartest has full capability to analyse the substrate to which an antibacterial finish has been applied.

SERICIN AND FIBROIN SPECIFIC STAIN USED TO CHARACTERIZE SILK FILAMENTS

Filament silk or bombyx mori silk is extruded from two seperate glands in the region of the spinerette on the silkworm’s head as it spins its cocoon. These two filaments are composed of beta pleated sheets of fibroin protein which are joined together by a sericin outer sheath which is simultaneously extruded from two other glands in the region of the silkworm’s spinerette.

The sericin outer sheath and fibroin inner region can be seen in the following low and high magnification scanning electron micrographs:

 

Scanning Electron Micrograph Of Woven Silk Fabric

Scanning Electron Micrograph Of Woven Silk Fabric

 

Highn Magnification Image

Scanning Electron Micrograph of Sericin Coated Bave Containing Two Fibroin Brins

 

 

To further differentiate the sericin/fibroin interface Vartest has developed a stain which colors the sericin outer sheath purple and the fibroin filaments pink as seen in the following light micrograph:

 

Silk warp yarn dissected from woven fabric.

The sericin surrounding the bave has been stained purple, the two fibroin brins pink.

 

The two fibroin filaments in combination with the sericin outer sheath is known as a bave, while the individual fibroin filaments are known as brins.

Vartest combines multiple testing and analytical techniques to fully characterize fibers both as manufatured and in end use.