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|Title: ||Functional plastein from fish waste|
|Authors: ||Jasim, Munir A.|
|Issue Date: ||1983|
|Publisher: ||© M.A. Jasim|
|Abstract: ||Enzymatic hydrolysis of fish waste has been examined using
proteolytic enzymes under different conditions of pH, enzyme to
substrate ratio, and substrate concentration. Proteolytic enzymes
have then been used to synthesise a protein-like product (plastein).
The particular enzymes used in both parts of this study were
bromelein, a-chymotrypsin, pepsin and papain. Reasonable yield was
obtained. The yield of plastein was found as a function of substrate
concentration. enzyme to substrate ratio, degree of hydrolysis and
enzyme used. Generally, the plastein appeared to be odourless,
yellowish to creamy in colour. tasteless and rich nutritionally.
The insoluble plastein formed was washed, dried and then tested
for its functional properties, particularly with respect to water
absorption capacity, swelling capacity, oil absorption capacity.
foam and foam stability, emulsion stability, gelatination, viscosity,
and heat-setting properties.
The functional properties of the plastein precursor (fw*hydrolysate)
and of commercial proteins have also been examined. The
dried plastein which was tested under different conditions was
found not only to possess functional properties such as fat/water
absorption, swelling and emulsion stability. but also excellent
foaming properties were observed. Although plastein appeared to be gel-like before drying, it
was, however. not able to retain its gelatinity after drying.
Therefore, it would be possible to use it in a food system as an
alternative to the material substituted without changing the texture
(e.g. in cereal products).
The viscosity of the plastein was varied under the conditions
used. It was found to be mainly a function of the temperature and
the concentration. Finally. it was noted that plastein shows heatsetting
properties when prepared under certain conditions.|
|Description: ||A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.|
|Appears in Collections:||PhD Theses (Chemical Engineering)|
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