Christine Suh

PressPac: Silkworms spin colored silks while on a ‘green’ diet

Blog Post created by Christine Suh on Dec 4, 2013

Here’s an item from this week’s PressPac that we thought you’d enjoy. The PressPac features summaries of articles appearing in our peer-reviewed journals and Chemical & Engineering News. To get the entire PressPac in your inbox, email us at newsroom@acs.org.


For some 5,000 years, cultivated silkworms have been spinning luxurious white silk fibers destined for use in the finest clothing. But current dyeing practices produce wastewater that contains potentially harmful toxins, so scientists are turning to a new, “greener” dyeing method in which they coax already-colored fibers from the caterpillars by feeding them dyed leaves. Their findings are published in the journal ACS Sustainable Chemistry & Engineering.


Anuya Nisal, Kanika Trivedy and colleagues point out that dyeing textile fabrics is one of today’s most polluting industries. The process requires huge quantities of water for bleaching, washing and rinsing, and it results in a stream of harmful wastewater that needs to be treated effectively before release into the environment. To make the industry greener and more environmentally friendly, researchers have been developing less toxic methods, including feeding dyed leaves to silkworms so they spin colored — rather than white — cocoons. But so far, this technique has only been tested with one type of dye, which is too pricey for large-scale production. Thus, the team turned to azo dyes, which are inexpensive and account for more than half of the textile dyes used today.


They dipped or sprayed mulberry leaves, the silkworm’s food of choice, with azo dyes to see which ones, when consumed, would transfer to the silk. Of the seven dyes they tested, three were incorporated into the caterpillars’ silk, and none seemed to affect the worms’ growth. The scientists noticed that certain dye traits, such as the ability to dissolve in water, affected how well the dye worked. “These insights are extremely important in development of novel dye molecules that can be successfully used in this green method of producing colored silk fabrics,” they conclude.


The authors cite funding from the CSIR-National Chemical Laboratory, Pune, and the Central Sericultural Research and Training Institute, Mysore.


"Uptake of Azo Dyes into Silk Glands for Production of Colored Silk Cocoons Using a Green Feeding Approach"


Click here for the abstract.


*Journalists can request a PDF of the journal article by emailing newsroom@acs.org.


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Credit: American Chemical Society


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