Master of Science (MS)
School of Nutrition and Food Sciences
Applying sodium tripolyphosphate to shrimp may cause excess water absorption and has become a major concern to phosphate producers, the consumer and regulatory agencies, such as, the United States Food and Drug Administration. The objective of this study was to examine Near Infrared (NIR) spectroscopy as a nondestructive and rapid method of detecting shrimp treated with sodium tripolyphosphate solutions of varying concentrations and treatment times. Wild caught Penaeus setiferus and aztecus Louisiana gulf coast shrimp were submerged in distilled water, 2.5% sodium tripolyphosphate (STPP), and 5% sodium tripolyphosphate solutions for 30, 60, 120, 240, 480, 960, 1920 minute time intervals. The total moisture was determined and correlated with the water peaks at 5330 and 7180 cm-1 on the resulting NIR spectra. Mineral analyses performed by Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES) for total phosphorus was intended for comparison with the baseline spectra at 5241 cm-1 for the spectra-structure of P-OH; however, there was not an identifiable trend for phosphorus. Partial least square calibration methods were applied to the spectral analyses to develop prediction models based on the changes in moisture content associated with the sodium tripolyphosphate shrimp treatments. As long as the immersion time is known, the concentration of the sodium tripolyphosphate solution can be determined using the moisture content of the treated shrimp samples. The low standard errors of prediction and validation coupled with recent advances in chemometrics have rendered NIR spectroscopy a viable option for the detection of sodium tripolyphosphate in treated shrimp.
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Todd, Alisa Marlene, "Utilizing Near-infrared Spectroscopy to Detect Sodium Tripolyphosphate in Treated Penaeus aztecus and setiferus Shrimp" (2011). LSU Master's Theses. 2353.