Extraction of collagen and gelatine from meat industry by-products for food and non food uses

  • Mokrejs P
  • Langmaier F
  • Mladek M
 et al. 
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Short tendons of slaughtered cattle, which consist of relatively pure collagen, were cleaned of lipoid substances and non-collagen proteins using a commercial enzymatic preparation. Diluted acetic acid was used to separate the acid-soluble collagen (M(N) approximately 300 kDa) for a yield of around 5%. The residue was extracted with water and the extraction conditions were derived to produce gelatine with a gel rigidity of 350-410 degrees Bloom and a yield of 55-60%. Prolonged extraction time, as well as increased extraction temperature, led to a deterioration in the gelatine quality and, therefore, the residue after aqueous extraction was processed by enzymatic hydrolysis into a collagen hydrolysate of M(N) = 500-1000 Da. Such hydrolysates can be utilized in industry as humectants in cosmetic skin-care preparations or as a secondary industrial raw material for producing surfactants of acylamino-carboxy acid type, which are known for their favourable dermatological effects. Apart from a maximum of 7% lipoid substances the proposed procedure produced no further waste so it may be regarded as a 'clean technology'.

Author-supplied keywords

  • Collagen hydrolysate
  • Extraction
  • Gelatine
  • Meat by-products
  • Soluble collagen
  • Wmr 1214-3

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  • Pavel Mokrejs

  • Ferdinand Langmaier

  • Milan Mladek

  • Dagmar Janacova

  • Karel Kolomaznik

  • Vladimir Vasek

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