Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 62, Issue 51, Pages 12326-12331Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf503754q
Keywords
Pleoticus muelleri; astaxanthin; scavenging capacity; nitrite; histopathology
Funding
- CONICET, Argentina [PIP 11201101-0515]
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The aim of this study was to investigate the effect of astaxanthin feed supplementation and environmental nitrite stress in postlarvae of Pleoticus muelleri (15 +/- 0.004 mg initial weight) under culture conditions. Diets containing three levels of astaxanthin, 0 mg kg(-1) of diet (C-0), 100 mg kg(-1) of diet (C-100), and 300 mg kg(-1) of diet (C-300), were used. Postlarvae fed with each diet were exposed to different concentrations of nitrite (NO2Na) (0-200 mg L-1. The 96 h median lethal concentration (LC50) values of nitrite N were 76.3, 89.7, and 157 mg L-1 for shrimps fed to C0, C-100, and C-300. The scavenging properties were evaluated against the stable 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical by electron resonance spectroscopy (EPR). For all feed treatments, the extracts exhibited strong DPPH scavenging activity; however, shrimp fed with C-100 and C-300 showed the greatest activity to quench DPPH (62 and 59%, respectively) with respect to C-0 (43%). It can be concluded that astaxanthin acts as a protector of nitrite stress in P. muelleri.
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