Use and determination of betacyclodextrin on textile substrates

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Use and determination of beta-cyclodextrin on
textile substrates

• Bojana Voncina
• University of Maribor, Textile Department,
  Smetanova 17, 2000 Maribor, Slovenia

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Structure and dimensions of cyclodextrins
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Conical structure of ? cyclodextrin
   
   

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Hostguest complex of ? cyclodextrin and toluene
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Applications of ? cyclodextrin in textile

• Application methods (Surface modification)
• Exhausting method
• Pad-batch method
• Printing
• Washing
• Preparation of polymers
• In fibre spinning
• Surface modification
• Encaptulation

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Polycarboxylic acids like 1,2,3,4
butanetetracarboxlic acid (BTCA) are well known
nonformaldehyde crosslinking reagents. BTCA has
four carboxylic acid groups, which can react with
hydroxyl groups of cellulose and form stable
ester bonds Esterification can occur with heat
alone or it can be accelerated by the presence of
salts of weak acids, such as sodium hypophosphite
(SHPI). Physical properties of cotton fabrics
treated with BTCA were comparable with those
obtained for cotton treated with the most
effective N-methylol reagents such as N,
N-dimethyloldihydroxy-ethylene-urea (DMDHEU)
     
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Grafting of ?-cyclodextrin on cotton using
polycarboxylic acid
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• Mercerised cotton, immersed in treated baths
• Wet pick up 100
• Predried at 110 º C, 10 minutes
• Fixation at 170 º C, 3 minutes
• Washed in cold water and at 60 º C 30 minutes

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• ?-cyclodextrin molecules linked to textile
  substrate can be
• determined qualitatively by Phenolphthalein and
  Phenol
• red.
• Alkaline solution of Phenolphthalein changes
  colour from carmine red for untreated textile
  substrate to colourless for BTCA/?-CD treated
  textile materials.
• Phenol red forms a yellow coloured complex with
  ?-CD, so Phenol red changes colour from red to
  yellow when ?-CD is present at the textile
  substrate.
• These qualitative methods can be use for white
  textile
• materials only.

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20 g/l ß-CD, 6 g/l BTCA, 3 g/l SHPI
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30 g/l ß-CD, 6 g/l BTCA, 3 g/l SHPI
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30 g/l ß-CD, 6 g/l BTCA, 6 g/l SHPI
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Quantitative determination of linked ?-CD

• Gravimetrical method
• The objective of the present study has been to
  develop semi-quantitative method for the
  evaluation of ?-CD fixed onto the textile
  materials by UV/Vis spectroscopy using alkaline
  solution of phenolphthalein.

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Conversion of carboxylic acid groups to
carboxylate anions After-treatment of BTCA/CD
finished cotton fabrics with alkaline solution
separate ester carbonyl band from carboxylic acid
band
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ATR FT-IR spectroscopy of nanoencaptulated cotton
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Mechanism of grafting with policarboxylic acids
 
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Conclusions

• We successfully grafted ?-cyclodextrin onto
  cellulose substrate by using crosslinking reagent
  BTCA.
• In our research the rapid and simple
  spectroscopic method for determination of
  micro-amount of cyclodextrin in solution was
  adopted to determine the amount of ?-cyclodextrin
  bonded onto the textile material.