Struktol

Storability as a varietal characteristic of sugar beet? – Results 2016–2018

Christine Kenter; Erwin Ladewig

The storability of sugar beet varieties grown in Germany has not been specified to date. In 2016–2018, nine storage trials were carried out in order to test the storability of 13 current varieties. The beet were stored in climate containers for approximately 480 °Cd. Root mass and the contents of sugar, invert sugar and marc were determined before and after storage. During storage, the sugar content decreased in all varieties while the invert sugar content increased. The observed sugar loss was most significant (about 10% of the amount before storage) in an environment where the syndrome „basses richesses“ had occurred. Differences among varieties were significant in six environments, but not for the mean of the eight trials without diseases. Variety recommendations concerning the storability of sugar beet are thus currently not possible.

2020 (145) 495–501
Language: GER

Prebiotics from energy cane bagasse

Giovanna M. Aita; Young Hwan Moon

Xylooligosaccharides (XOS) is a group of emerging prebiotics that selectively stimulate the growth of advantageous gastrointestinal bacteria benefitting the host’s gut health and functionality. XOS can achieve positive biological effects at low daily doses and low caloric content, properties that are the same or more desirable than the already established prebiotics. XOS are present in plants in very low amounts so there is a great opportunity to isolate XOS with varying degrees of polymerization from the hemicellulose (xylan) fraction of lignocellulosic materials (e.g., bagasse), a source that offers both economic and environmental advantages. In this study, the recovery of XOS by the combined use of activated carbon adsorption, water washing and ethanol desorption from diluted acid pretreated energy cane bagasse hydrolysates was evaluated. The recovered XOS was tested for its prebiotic activity on Bifidobacterium adolescentis ATCC 15703. The final product of extracted XOS from energy cane bagasse (XOS EC Bagasse crude sample) had a purity of 93%, which was comparable to the purities observed with two commercially available XOS prebiotics, CPA (89%) and CPB (93%). XOS EC Bagasse crude sample exhibited prebiotic properties by stimulating the growth of B. adolescentis ATCC 15703 and by producing lactic acid, which were comparable to those observed with the commercial prebiotics.

2020 (145) 488–494
Language: ENG

Scale characteristics and removal

Jan Maarten de Bruijn

Scaling, fouling of heat exchange surfaces, may significantly reduce heat transfer and thus affects the energy-efficiency of a sugar factory. Particularly lime salts and silica are known as the main components of scale, but fouling by deposition of insoluble organic substances may occur too. This paper summarizes the different causes of scaling in both beet and cane factories as well as the average composition of scale found at the different process stages. The process chemicals generally applied for removal of scale from heat exchange surfaces will be briefly discussed.

2020 (145) 481–487
Language: ENG

Influence of tissue strength on root damage and storage losses of sugar beet

Gunnar Kleuker; Christa Hoffmann

Harvesting and cleaning of sugar beet lead to root damage, which increases storage losses due to wound healing and by causing entry points for pathogens. This study aimed at quantifying the effects of variety and site on the tissue strength of sugar beet roots, and moreover, to evaluate the impact of tissue strength on damage and storage losses. For this purpose, field trials with three varieties were carried out at six sites, three in Germany and the others in Belgium, the Netherlands and Sweden in 2018. Texture analysis and storage trials were conducted in Göttingen. Puncture and compression measurements revealed differences in tissue strength between varieties and sites. Drought stress during the vegetation period significantly reduced the tissue strength. Tissue strength of sugar beet roots turned out to be an environmental stable variety characteristic. It is not possible to draw conclusions from tissue strength to storage losses at a site, since many other factors, such as growing conditions, diseases and damage due to harvester settings have a strong impact. However, tissue strength might be an indicator for damage susceptibility and storage losses of sugar beet varieties.

2020 (145) 435–443
Language: ENG

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