CHEMICAL CHANGES IN SKIN MUCIN AS AN INDEX OF EARLY STAGES OF SPOILAGE IN FISH.
CHEMICAL CHANGES IN SKIN MUCIN AS AN INDEX OF EARLY STAGES OF SPOILAGE IN FISH.
Date
1977
Authors
RAO, S. V. SURYANARAYANA
LEE., S.J
Journal Title
Journal ISSN
Volume Title
Publisher
Society of Fisheries Technologists (India) Cochin
Abstract
Results of a preliminary investigation on the overall chemical
nature of fish skin mucin in lung fish, C!arias batrachus,
with special reference to water soluble low molecular weight
compounds, are presented. Changes observed during room
temperature spoilage have been studied with a view to present
a new approach towards the assessment of freshness in fish
inspection. pH of the mucin was distinctly alkaline (8.2) and
remained unchanged during spoilage. Much of the nitrogen
was found to be present in the glycoprotein fraction. Free
amino acids and purine bases were present in apreciable
quantities in the aqueous extracts which registered a significant
increase after 10 hrs. Post-mortem increase in total solids was.
accompanied by a slight rise in protein nitrogen which may
indicate tissue breakdown. Increase in TVN was also observed
to occur earlier ]n the outside mucin as compared to the
inside muscle. Presence of free sugars or sialic acid could not
be confirmed nor was there any indication of cholesterol and
lipoid material as stated in earlier littrature
Description
Keywords
CHEMICAL CHANGES,SKIN MUCIN,INDEX ,EARLY STAGES,SPOILAGE ,FISH
Citation
Fishery Tech 14(2):134-140