Fractionation and reconstitution techniques were used to study the contribution of endogenous flour lipids to the quality of semisweet (Rich Tea-type) biscuits. Biscuit flour was defatted with chloroform and baked with bakery fat but without endogenous lipid addition. Semisweet biscuits baked from defatted flour were flatter, denser, and harder and showed collapse of gas cells during baking when compared with control biscuits. Defatted flour semisweet doughs exhibited a different rheological behavior from the control samples showing higher storage and loss moduli (G' and G' ' values), that is, high viscoelasticity. Functionality was restored when total nonstarch flour lipids were added back to defatted flour. Both the polar and nonpolar lipid fractions had positive effects in restoring flour quality, but the polar lipid fraction was of greatest benefit. Both fractions were needed for complete restoration of both biscuit quality and dough rheological characteristics.
The fate of deoxynivalenol (DON), zearalenone (ZEA) and fumonisins B1 (FB1) and B2 (FB2) were examined in three representative snack food production methods. Assessing results on an 'as is' basis so as to compare results with EC legislation showed DON to be the most stable mycotoxin during the manufacture with mean levels in each finished products >68% of the levels in the starting ingredients. The concentrations of ZEA in the snack food ingredients during this study were very low but did allow limited studies that showed a mean 52% reduction during the manufacture of one snack product, but little reduction when producing a tortilla chip. In contrast, fumonisins were mostly lost (>90%) in two out of the three processes. However in a tortilla chip prepared from maize flour by extrusion, heating and frying, the amount of FB1 + FB2 remaining in the retail product was reduced on average by 59% which is similar to the 60% difference in the statutory levels for flour (products <500 micron) or 50% difference for grits (products >500 micron) and retail snack products. Thus the use of maize containing fumonisins in maize flour at levels just meeting legal limits would present some risk that a proportion of retail products might fail to meet legislation when the run to run variability is considered. The buyer/processor should thus avoid ingredients containing mycotoxin levels close to legislatory limits for use in processes where reduction at successive stages in manufacture are close to or less than those in the legislation. It is suggested that this study provides a useful indication of these. In commercial operation, there is a reluctance to specify raw materials at anything but the finishing product levels with implications for availability and cost.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.