The aim of the present work was to develop and optimize a method for determination of bioavailable phosphorus in samples of feces and fish feed using ultrasound extraction and subsequent quantification by visible spectrophotometry. Using as extractor solution HNO3 0.50 mol L -1, the great conditions of extraction established were: sample mass - 100 mg, samples granulometry - < 60 μm, sonification time - five cycles of 40 s and ultrasound potency - 136 W. The proposed method was applied in studies of digestibility of this nutrient in different feeds used in diets of juvenile of Nile tilapia.
|Translated title of the contribution||Determination of bioavailable phosphorus in fish feeds by ultrasound extraction and visible spectrophotometry|
|Number of pages||5|
|Publication status||Published - 2009|
- Ultrasound extraction
- Fish nutrition
- Phosphorus absorption