Fróðskaparrit - 01.01.1968, Blaðsíða 12

20
Eitt dømi um saltfisk, ið varð mislittur av kopari
leiðir og somu tíð, sum skipið við gulnaðum og brúnkaðum
fiski, og sum hevði tikið salt um somu tíð frá somu saltsølu,
kemur høvundurin til tað, at hvørki sjálvsundurloysing av
fiskinum, áðrenn hann kom í salt, ella saltið sjálvt í sínum
upprunliga líki vóru atvold í, at fiskurin fek'k ringan lit.
í parti av saltfiski var funnið uppí 400 mg/kg, av Cu + +
og í leivd av salti í lastarúminum 310 mg/kg, meðan salti upp-
runaliga hevði 0,5 mg/kg. Cu ~ innihaldið í tí ytsta brúnk-
aða jaðurinum á fiskinum var væl størri enn inni í fiskinum:
40 mg/kg í ytstu 2 mm av einum brúnkaðum fiski, 17 mg/kg
í miðal av sama fiski.
Úrsditið av kanningini má vera, at lutir úr kopari eila kopar-
sambræðing verða ikki havdir i rúmum har sait verður goymt
ella saltaður fiskur verður viðgjørdur og goymdur.
SUMMARY
The present paper deals with a characteristic example of salt fish
changing colour because Cu++ has affected salt and fish on board a
fishing ship. Some of the fish becomes yellow and brown and, conse-
quently, unsaleable. Investigations have shown that this Cu++ must
have come from copper parts in the hold, particularly two copper tubes
with refrigerant which were placed in a closed wooden pipe in the upper
part of the hold, and which connected the refrigerator with the refrige-
rated hold.
In the first part of the paper are given the latest findings in regard
to autolytic actions in fish and changes in the concetration of sugar and
amino acids which may cause light-coloured fish to become yellow or
brown. The fish treated of in this paper was caught of Western Greenland
from April 12 to June 30. The fish was all prepared and salted the same
day as it was caught. By comparing this fish with fish from another ship
which had been fishing in the same waters and during the same period
as the ship with the yellow and brown fish, and which had taken in
salt at the same time and from the same salt silo, the author arrives at
the conclusion that the bad colour is neither due to autolysis of the fish,
nor to the salt in its original state.
In a section of one salt fish tested for copper the Cu content was
400 mg/kg (p. p. m.). Salt remains in the hold (fig. 1) showed 310 mg/kg
(p. p. m.), whereas the original Cu++ content was 0.5 kg (p. p. m.). The