Shelf life assessment of hot smoked African catfish stored under different storage conditions from Lake Kenyatta, north coast, Kenya

  • Maurice O. Obiero Kenya Marine and Fisheries Research Institute
  • Cyprian O. Odoli Kenya Marine and Fisheries Research Institute
  • Peter O. Odote Kenya Marine and Fisheries Research Institute
  • Raymond K. Ruwa Kenya Marine and Fisheries research Institute
  • Maurice O. Omega Kenya Marine and Fisheries research Institute
Keywords: storage, smoking, Chorkor, catfish, Lake Kenyatta, shelf life, packaging

Abstract

Catfish (Family Clariidae) from Lake Kenyatta in coastal Kenya was smoked using an improved smoking (Chorkor) oven and subjected to storage under different packaging conditions. Biochemical, proximate composition and sensory parameters were used to determine the shelf life of the product for a period of 30 days. Peroxide values for samples stored under open, ambient air, and vacuum packaging increased significantly (p < 0.05) from 7.296 megO2/kg to 24.890 meqO2/kg, 28.940 meqO2/kg and 18.729 meqO2/kg, respectively. Thiobarbituric acid reactive substances increased from 0.459 mg/kg to 4.653 mg/kg, 1.473 mg/kg and 0.339 mg/kg during storage under open, ambient air, and vacuum packaging, respectively. Total volatile bases-nitrogen increased significantly with storage days, from 1.349 mgN/100g to 5.182 mg N/100g, 6.700 mgN/100g and 2.001 mgN/100g for open, ambient air, and vacuum packaging, respectively. During storage, proximate composition for the stored samples differed significantly between the open and ambient air package only, while sensory changes were observed on day 30 only. Texture remained the same to day 30 for all samples stored under difference storage conditions. Water activity ranged between 0.7 and 0.79 during the same period in the three packaging conditions. In general, the 30 days storage period did not compromise the acceptability of smoked products.

Author Biographies

Maurice O. Obiero, Kenya Marine and Fisheries Research Institute
Researcher with Kenya Marine and Fisheries Research Institute
Cyprian O. Odoli, Kenya Marine and Fisheries Research Institute
Senior Reseacher with Kenya Marine and Fisheries Research Institute
Peter O. Odote, Kenya Marine and Fisheries Research Institute
Principal Researcher with Kenya Marine and Fisheries Research Institute
Raymond K. Ruwa, Kenya Marine and Fisheries research Institute
Laboratory technogist with Kenya Marine and Fisheries Research Institute
Maurice O. Omega, Kenya Marine and Fisheries research Institute
Senior Technician With Kenya Marine and fisheries Research Institute
Published
2019-08-13
Section
Articles

Journal Identifiers


eISSN: 0856-860X
print ISSN: 0856-860X