Extraction of bromelain from pineapple peels

Food Sci Technol Int. 2011 Aug;17(4):395-402. doi: 10.1177/1082013210387817. Epub 2011 Aug 3.


Large amount of pineapple peels (by-products) is left over after processing and they are a potential source for bromelain extraction. Distilled water (DI), DI containing cysteine and ethylenediaminetetraacetic acid (EDTA) (DI-CE), sodium phosphate buffer pH 7.0 (PB) and PB containing cysteine and EDTA (PB-CE) were used as extractants for bromelain from the pineapple peels. The highest bromelain activity was obtained when it was extracted with PB-CE (867 and 1032 units for Nang Lae and Phu Lae cultv, respectively). The PB could maintain the pH of the extract (pH 5.1-5.7) when compared with others. Under sodium dodecyl sulfate polyacrylamide gel electrophoresis, the extract showed protein bands in the range 24-28 kDa. The protein band with a molecular weight of ∼28 kDa exposed the clear zone on blue background under the casein-substrate gel electrophoresis. The effects of the bromelain extract on the protein patterns of beef, chicken and squid muscles were also determined. Trichloroacetic acid soluble peptide content of all the treated muscles increased when the amount of bromelain extract increased. Decrease in myosin heavy chains and actin was observed in all the muscle types when bromelain extract was used. The best extractant for bromelain from pineapple peels was PB-CE. Moreover, bromelain extract could be used as a muscle food tenderizing agent in food industries.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Ananas / enzymology*
  • Animals
  • Bromelains / chemistry
  • Bromelains / economics
  • Bromelains / isolation & purification*
  • Bromelains / metabolism
  • Cysteine / chemistry
  • Edetic Acid / chemistry
  • Food Additives / chemistry
  • Food Additives / economics
  • Food Additives / isolation & purification*
  • Food Additives / metabolism
  • Food-Processing Industry / economics
  • Food-Processing Industry / methods
  • Fruit / enzymology*
  • Hydrogen-Ion Concentration
  • Hydrolysis
  • Indicators and Reagents / chemistry
  • Industrial Waste / analysis*
  • Industrial Waste / economics
  • Meat / analysis
  • Molecular Weight
  • Muscle Proteins / chemistry
  • Muscle Proteins / metabolism
  • Peptide Fragments / chemistry
  • Peptide Fragments / metabolism
  • Shellfish / analysis
  • Species Specificity
  • Thailand


  • Food Additives
  • Indicators and Reagents
  • Industrial Waste
  • Muscle Proteins
  • Peptide Fragments
  • Bromelains
  • Edetic Acid
  • fruit bromelain
  • Cysteine