Digitized by Kansas Correctional Industries

Digitized by Kansas Correctional Industries

The fungal disease Fusarium head blight affects cereal grains and can produce mycotoxins, like the water-soluble deoxynivalenol (DON). Wheat wet milling process begins with ground endosperm obtained by dry milling and ends with the separation of starch from gluten. Research was conducted on hard red spring wheat and durum wheat samples naturally contaminated with DON. The fate of DON in wheat dry milled fractionations (farina/semolina, shorts, and bran) during wet milling was investigated. Three wet milling processes were evaluated. DON levels were assessed by GC-ECD. Results showed that DON was present in all dry milled fractions. DON concentration in farina and semolina exceeded the safety threshold for human consumption. After wet milling farina and semolina, nearly all the DON was found in the water-soluble fraction, regardless the wet milling process. A negligible level of DON was found in the gluten extracted from HRSW with Martin wet milling process.

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Doctor of Philosophy / Biochemistry and Molecular Biophysics Interdepartmental Program / John M. Tomich / David L. Wetzel / The technique of near infrared chemical imaging has been widely used for many industrial applications. It offers selectivity and/or sensitivity for numerous organic functional groups. The advantage of the near infrared spectroscopic region is the linear relationship of absorbance and concentration that enables quantitation. This universally employed technique has been a boon for research studies in the industrial process of wheat milling for the production of flour. The milling process has numerous sequential grinding and sieving steps that enable selective physical segregation of a starch rich endosperm product from wheat. Thousands of spectra of purified endosperm and non-endosperm standards are collected to develop a spectral library. Quantitation of the purity of individual processing streams is accomplished by applying a partial least squares calibration that is based upon the spectral library. The quantitative chemical imaging technique is useful for determination of endosperm purity profiles for mill flour streams. These plots reveal purity changes as less pure streams are added to produce a flour blend. The chemical structural basis furthermore allows comparison of purity even with changes in the wheat blend being milled with representative standardization. Furthermore, whereas a certain section of sieves is responsible, for designating the material defined as flour, application of the spectroscopic method is obvious. Select examples of key processing streams were studied to show the possibility of sieve-by-sieve analysis of the physical separation to provide mill optimization. These novel methods of analysis would not be possible without the sensitive and selective method of quantitative chemical imaging. Application of this technique to a few select unit processes is projected to reasonably affect a 1% increase in the yield of high quality flour. This amounts to a significant financial gain against low profit margins.

LD2668 .T4 1940 M33 / Master of Science

Call number: LD2668 .T4 1984 L386 / Master of Science

Typescript (photocopy). / Digitized by Kansas Correctional Industries

Call number: LD2668 .T4 1985 D73 / Master of Science

Djordjija B. Petkovski, Alexander H. Levis. / Bibliography: leaf 7. / "February 1985." / "...supported in part by the U.S.-Yugoslav Joint Board on Scientific and Technological Cooperation under Grant YOR-83/068."