Long-term stability of nutrients in a frozen mixed food control material

A mixed mushroom control material to facilitate inter-laboratory harmonization of mushroom composition analyses

“…Additionally, substantial data accumulated for an in-house mushroom control composite utilized in the USDA NFNAP and previously reported on (Phillips et al, 2011a,b) and for other food control materials (Phillips et al, 2006) stored under the very same conditions longer periods of time were evaluated. The stability of these potentially labile components due to light, temperature, and atmosphere, along with previous reports on nutrient stability in food samples (Phillips et al, 2001(Phillips et al, , 2005(Phillips et al, , 2010b(Phillips et al, , 2016 were considered a reasonable indicator of the stability of other components.…”

“…If 8 results for the exact same sample (e.g., a CM) are reported in separate studies, comparison of the results for that material provide a measure of inter-laboratory analytical variability, so that only differences in assayed component levels for samples reported in each study would be considered actual differences in composition. Food matrix CM for a wide range of foods and nutrients have been prepared and maintained for the past 20 years at the Food Analysis Laboratory Control Center (FALCC) at Virginia Tech (Blacksburg, VA, USA) as part of the USDA NFNAP (Haytowitz et al, 2007;Phillips et al, 2006Phillips et al, , 2008aPhillips et al, , 2010a and several multicenter clinical feeding trials (Dennis et al, 1998;Phillips et al, 1999Phillips et al, , 2001). In the context of the NFNAP, a relatively small mushroom CM was prepared as a control for limited components analyzed in retail samples of mushrooms in the U.S. food supply (Phillips et al, 2011a(Phillips et al, ,b, 2012Simon et al, 2011).…”

Stability of vitamin C in frozen raw fruit and vegetable homogenates

“…Composites were prepared following the standard NFNAP protocols for fruits and vegetables [homogenization in liquid nitrogen using a Robot Coupe Blixer food processor (Robot Coupe USA, Jackson, MS) and storage of subsamples at À60 AE 5 8C under nitrogen in sealed glass jars] that was previously shown to yield homogeneous subsamples (Phillips et al, 2006) and maintain moisture content (Phillips et al, 2001). Vitamin C was assayed immediately after homogenization, and then in subsamples that were stored at À60 AE 5 8C.…”

Quality control materials development for proximate composition determination in baby foods to enhance the Portuguese food composition database: Packaging conditions

“…(Sarembaud et al, 2007). Stability duration and time points are discussed by Philips et al In this study duration of stability studies is shorter than those described for USDA programme (Phillips et al, 2001), due to differences in project periods in Portuguese project time periods for stability overlapped the total time for which support of the overall project has been programmatically approved to execute analytical assays, although stability studies from 2 up to 5 years are planned for next project.…”