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University of Nebraska - Lincoln

Dissertations, Theses, & Student Research in Food Science and Technology

Agriculture

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From Milpas To The Market: A Study On The Use Of Metal Silos For Safer And Better Storage Of Guatemalan Maize, José Rodrigo Mendoza Jul 2016

From Milpas To The Market: A Study On The Use Of Metal Silos For Safer And Better Storage Of Guatemalan Maize, José Rodrigo Mendoza

Dissertations, Theses, & Student Research in Food Science and Technology

This project aimed to implement the use of metal silos to improve quality and safety of maize consumed by inhabitants of the highlands of Guatemala. This manuscript includes a literature review of the maize production chain in Guatemala, a survey about agricultural practices used in the region of study, as well as a characterization of the analyzed maize regarding its mycoflora, nutritional composition, and insect infestation. To better understand the current situation regarding agricultural practices and maize consumption, a survey was carried out. Sample consisted of 280 families representing 14 rural communities distributed in the townships of Todos Santos and ...


The Influence Of The Bovine Fecal Microbiota On The Shedding Of Shiga Toxin-Producing Escherichia Coli (Stec) By Beef Cattle, Nirosh D. Aluthge May 2015

The Influence Of The Bovine Fecal Microbiota On The Shedding Of Shiga Toxin-Producing Escherichia Coli (Stec) By Beef Cattle, Nirosh D. Aluthge

Dissertations, Theses, & Student Research in Food Science and Technology

During the past three decades, Shiga toxin-producing E.coli (STEC) have emerged as an important food safety concern. Although initially E. coli O157 was the main focus, recent outbreaks and resulting investigations have shown that certain non-O157 STEC are as much a threat to food safety as their O157 counterparts. To the beef industry, STEC have been of particular concern due to the frequent association of beef and beef products as vehicles of STEC infection. As a result, along with E. coli O157, six non-O157 STEC serogroups (known as the ‘big six’) are now regulated as adulterants in certain raw ...


Pulsed Electric Field (P.E.F) And Pectinase For The Extraction Of Polyphenols From Grape Pomace And Peel, Julien Khalil Aug 2011

Pulsed Electric Field (P.E.F) And Pectinase For The Extraction Of Polyphenols From Grape Pomace And Peel, Julien Khalil

Dissertations, Theses, & Student Research in Food Science and Technology

Grapes are an important source of bioactive compounds such as gallic acid, resveratrol, and catechin. The consumption of grapes is associated with a lower risk of diseases such as cardiovascular diseases and some types of cancer. Grape pomace and skins are good sources of many phytochemicals known for their antioxidant potential.

In this research, the peel of the Chilean “Flame” grape cultivar and the pomace of St. Croix, Frontenac and St. Pepin grape cultivars were subjected to a pulsed electric field (5 KV, 1 μFarad, 20 Pulses) and to an enzymatic treatment (Pectinase, 5KU). The total phenolic content, determined in ...