NMR Detection of Tomato Paste Spoilage in 1000 Liter Metal Lined Totes

Poster to be Presented at the 56th ENC, Asilomar CA, April 2015

NMR Detection of Tomato Paste Spoilage in 1,000 L, Metal Lined Totes
Michele Martin1; Paul Giammatteo2; Michael McCarthy1; Matthew Augustine1
1University of California, Davis, Davis, California; 2Process NMR Associates, Danbury, CT
Abstract
Low field nuclear magnetic resonance (NMR) is used as a non-invasive method for detecting spoiled tomato paste. It is shown that the 1H T1 and T2 relaxation times change as tomato paste spoils due to changes in viscosity and/or changes in the concentration of paramagnetic compounds. With the goal of developing a spoilage detector that can be used in a tomato processing facility, a γBo = 19.5 MHz single-sided handheld NMR instrument is used. Due to the dominance of diffusion on relaxation measurements made with the single sided instrument, the slope of the amplitude of a spin echo for three different delay times is used to provide a viscosity dependent parameter that permits the differentiation between pristine and spoiled tomatoes.One-Sided NMR - Non-Invasive Analysis of  Tomato Paste

One-Sided NMR – Non-Invasive Analysis of Tomato Paste