Agarose gel for controlled wet cleaning of textiles

Introduction to Agarose gel

Agarose is one of the two principal components of agar, and is purified from agar by removing agar’s other component, agaropectin.

Chemistry – Agarose, the gelling fraction, is a neutral linear molecule essentially free of sulfates, consisting of chains of repeating alternate units of ß-1,3-linked- D-galactose and a-1,4-linked 3,6-anhydro-L-galactose.

Agarose is a polysaccharide that can be used to form a gel (often used to separate molecules based on size). Basically, agarose behaves like gelatin. Scientists can heat and cool a mixture of agarose to form a gel.

What do we mean by the term ‘gel’?

A gel is a solid jelly-like soft material that can have properties ranging from soft and weak to hard and tough. Gels are defined as a substantially dilute cross-linked system, which exhibits no flow when in the steady-state. By weight, gels are mostly liquid, yet they behave like solids due to a three-dimensional cross-linked network within the liquid. It is the crosslinking within the fluid that gives a gel its structure (hardness) and contributes to the adhesive stick (tack). In this way, gels are a dispersion of molecules of a liquid within a solid medium. The word gel was coined by 19th-century Scottish chemist Thomas Graham by clipping from gelatine.

Use of Agarose gel in cleaning

Agarose gels, through capillary action, can be used as a slow, controlled cleaning method.

It has been established that agarose gels can be the best method for cleaning in following cases:

  1. if the textile requires a special chemical compound for stain removal, such as enzymes,
  2. for stains on textiles in danger of dye bleed
  3. controlled or spot cleaning where there are small exposed areas of textile in between metal thread embroidery.

Example

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IMG_9228

z1-tile-A

1_before_a-tile

4 Comments

  1. Tina

    Congratulations on your work. I am a textile conservator working in Greece. I am experimenting currently with gels hoping to use them soon. Could you give us some more details on the treatment? (e.g.The concentration of the gel, its thickness, the duration of the treatment, if you used weight) You can use my e-mail as well to contact me.
    Thank you in advance!

    1. namitajaspal

      Greetings Tina! Thank you for taking interest in this brief write-up. We used 4% agarose in de-ionized water. It was roughly 2 mm thick. We did not use any weights.
      I would discuss further through email.

  2. Tina

    Thank you for the quick response! Yes, I would like to discuss further through e-mail. You can send me an e-mail from your address to send you my questions. Thank you for sharing!

    1. namitajaspal

      my email ID is namitajaspal72@gmail.com

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