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26 February 2020 | Story Leonie Bolleurs
Vegetable tunnels
Two vegetable tunnels were recently established on the UFS Bloemfontein Campus to contribute to the fight against food insecurity.

Food insecurity is a problem on university campuses worldwide. The three campuses of the University of the Free State (UFS) are not exempt from this plight. Research findings indicate that more than 64% of students at the university go through periods of hunger.

Annelize Visagie, , from the Division of Student Affairs who is heading the Food Environment Office at the UFS, confirms that food insecurity at higher education institutions is not a new phenomenon.

In a study with first-year students as focus, Visagie found that academic performance declines and coping mechanisms increase as the severity of food insecurity increases.

“Students use different coping mechanisms, with an alarming percentage of students (40,6%) using fasting as an excuse to friends for not having food, 60% of students skipping meals because they do not have enough money, and 43,2% of students being too embarrassed to ask for help.”

Visagie states that various factors contribute to this alarming scenario, with the main reason being that the majority of students come from impoverished economic and social circumstances. This suggests that although students receive NSFAS funding or any other bursary, it is not a guarantee that they are food secure.

Focus on student wellbeing
Aligning with the UFS strategic goal of improving student success and wellbeing, UFS staff is working hard to implement initiatives and obtain sponsorships and food donations to ensure that students do not go hungry.

Members of the university’s Food Environment Project, Drs Johan van Niekerk and JW Swanepoel from the Centre for Sustainable Agriculture, Rural Development and Extension (CENSARDE), and Karen Scheepers from the Division of Student Affairs who is heading KovsieAct partnered to move the existing vegetable tunnels on the UFS experimental farm to the Bloemfontein Campus.

The construction of the tunnels and boxes was financed by Tiger Brands. Professor Michael Rudolph and Dr Evans Muchesa who are involved with the Siyakhana Food Gardens, assisted with the training of students and consultation throughout the project.

The two tunnels (30 m x 10 m each) are covered with netting, and two water tanks with pumps are fitted to provide the necessary irrigation.

Vegetables add value
Dr Swanepoel explains: “In each tunnel there are 20 raised wooden boxes. Each residence received one box where they planted one type of vegetable crop, including Swiss chard, cabbage, carrots, beet, kale, and broccoli.”

Residence Committee members from all on- and off-campus student communities in civic and social-responsibility portfolios, as well as civic and social-responsibility student associations, received the necessary training to plant vegetables.

The vegetables were planted in mid-February and the first harvest is expected around mid-April.

This initiative, which will help students in the near future to keep the hunger pangs at bay in a healthy way, adds to the existing No Student Hungry programme. Visagie says it is important for the university to assist students in making healthy choices and to educate them on decisions to secure nutritional food for themselves.

In addition, the university also received food parcels from Rise Against Hunger, together with donations from organisations such as Gift of the Givers – providing 200 food parcels to students on the Qwaqwa Campus, and the recent donation from Tiger Brands – providing 500 food parcels to students.

News Archive

Research eradicates bacteria from avocado facility
2017-01-17

 Description: Listeria monocytogenes Tags: Listeria monocytogenes

Listeria monocytogenes as seen under an electron
microscope. The photo was taken with a transmission
electron microscope at the microscopy unit of the UFS.
Bacteriophages (lollipop-like structures) can be seen
next to the bacterial cells.
Photo: Supplied

“The aim of my project was to identify and characterise the contamination problem in an avocado-processing facility and then to find a solution,” said Dr Amy Strydom, postdoctoral fellow in the Department of Microbial Biochemical and Food Biotechnology at the University of the Free State (UFS).

Her PhD, “Control of Listeria monocytogenes in an Avocado-processing Facility”, aimed to identify and characterise the contamination problem in a facility where avocados were processed into guacamole. Dr Strydom completed her MSc in food science in 2009 at Stellenbosch University and this was the catalyst for her starting her PhD in microbiology in 2012 at the UFS. The research was conducted over a period of four years and she graduated in 2016. The research project was funded by the National Research Foundation.

The opportunity to work closely with the food industry further motivated Dr Strydom to conduct her research. The research has made a significant contribution to a food producer (avocado facility) that will sell products that are not contaminated with any pathogens. The public will then buy food that is safe for human consumption.


What is Listeria monocytogenes?

Listeria monocytogenes is a food-borne pathogenic bacterium. When a food product is contaminated with L. monocytogenes, it will not be altered in ways that are obvious to the consumer, such as taste and smell. When ingested, however, it can cause a wide range of illnesses in people with impaired immune systems. “Risk groups include newborn babies, the elderly, and people suffering from diseases that weaken their immune systems,” Dr Strydom said. The processing adjustments based on her findings resulted in decreased numbers of Listeria in the facility.

The bacteria can also survive and grow at refrigeration temperatures, making them dangerous food pathogens, organisms which can cause illnesses [in humans]. Dr Strydom worked closely with the facility and developed an in-house monitoring system by means of which the facility could test their products and the processing environment. She also evaluated bacteriophages as a biological control agent in the processing facility. Bacteriophages are viruses that can only infect specific strains of bacteria. Despite bacteriophage products specifically intended for the use of controlling L. monocytogenes being commercially available in the food industry, Dr Strydom found that only 26% of the L. monocytogenes population in the facility was destroyed by the ListexP100TM product. “I concluded that the genetic diversity of the bacteria in the facility was too high and that the bacteriophages could not be used as a control measure. However, there is much we do not understand about bacteriophages, and with a few adjustments, we might be able to use them in the food industry.”

Microbiological and molecular characterisation of L. monocytogenes

The bacteria were isolated and purified using basic microbiological culturing. Characterisation was done based on specific genes present in the bacterial genome. “I amplified these genes with polymerase chain reaction (PCR), using various primers targeting these specific genes,” Dr Strydom said. Some amplification results were analysed with a subsequent restriction digestion where the genes were cut in specific areas with enzymes to create fragments. The lengths of these fragments can be used to differentiate between strains. “I also compared the whole genomes of some of the bacterial strains.” The bacteriophages were then isolated from waste water samples at the facility using the isolated bacterial strains. “However, I was not able to isolate a bacteriophage that could infect the bacteria in the facility.

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