NDLI: Heat- and light-treatment change the visible fluorescence of Akoya cultured pearls

Content Provider	Springer Nature Link
Author	Hiramatsu, Junichi Iwahashi, Yasunori Nagai, Kiyohito
Copyright Year	2013
Abstract	We exposed Akoya cultured pearls separately to heat (60–120 °C) and artificial light to investigate changes to fluorescence in the visible range and yellowing. We found that for both heat-treated and light-treated pearls, the fluorescence peak shifted from 480 to 430 nm with an increase in fluorescence intensity. This change in intensity was more prominent in heat-treated pearls, with the initial speed of increase rising with treatment temperature; treatment at 100 °C caused the greatest increase in fluorescence intensity. However, aminoguanidine suppressed the heat-induced change in the fluorescence of an ethylenediaminetetraacetic acid–soluble nacreous layer matrix. These results suggest that the heated-induced changes in the fluorescence of Akoya cultured pearls were caused largely by a buildup of fluorescent advanced glycation end products through the Maillard reaction. Although heat treatment led to a large increase in fluorescence intensity of the peak at approximately 430 nm in a deoxygenized environment, hardly any change in fluorescence intensity was observed after light treatment in this environment. Moreover, a new shoulder peak appeared at about 460 nm after light treatment. These results suggest that the Maillard reaction was not a major factor in the light-induced changes in the fluorescence of Akoya cultured pearls.
Starting Page	959
Ending Page	966
Page Count	8
File Format	PDF
ISSN	09199268
Journal	Fisheries Science
Volume Number	79
Issue Number	6
e-ISSN	14442906
Language	English
Publisher	Springer Japan
Publisher Date	2013-08-27
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Akoya cultured pearl Fluorescence spectrum Maillard reaction AGEs Heat-yellowing Photo-yellowing Fish & Wildlife Biology & Management Freshwater & Marine Ecology Food Science
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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