Dear Brian and List
Briefly, they are crystals of calcium carbonate which precipitate from
solution during frozen storage. One preventative measure is to store the
product at a low temperature. Relevant publications are:
Careche, M., Herrero, A. & Carmona, P., 2002, Raman analysis of white spots
appearing in the shell of argentine red shrimp (Pleoticus muelleri) during
frozen storage. Journal of Food Science, 67, 2892-2895
Mikkelsen A, Engelsen SB, Hansen HCB, Larsen O, Skibsted LH., 1997. Calcium
carbonate, crystallization in the alpha-chitin matrix of the shell of pink
shrimp, Pandalus borealis, during frozen storage. J. Cryst. Growth 177,
125-134.
Mikkelsen A, Ronn B, Skibsted LH. 1997, Formation of white spots in the
shell of raw shrimps during frozen storage: Seasonal variation and effects
of some production factors. Journal of the Science of Food and Agriculture,
75, 433-441.
Mikkelsen A, Andersen AB, Engelsen SB, Hansen HCB, Larsen O, Skibsted LH.,
1999, Presence and dehydration of ikaite, calcium carbonate hexahydrate, in
frozen shrimp shell. Journal of Agricultural and Food Chemistry, 47,
911-917.
Peter Howgate
----- Original Message -----
From: "Cuff, Brian" <BCuff@fpil.com>
To: <seafood@ucdavis.edu>
Sent: Monday, February 10, 2003 12:18 PM
Subject: White spot in Shrimp
> Dear list
> Recently I received a complaint from a customer re white spot in frozen
raw
> shell on shrimp. Can anybody from this list provide me with info as to
what
> this is, and what is the cause?
>
> Brian Cuff
> bcuff@fpil.com
>
>
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