Tag Archives: blueberry

1337–1345 L. Klavins, J. Kviesis and M. Klavins
Surface wax composition of wild and cultivated Northern berries
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Surface wax composition of wild and cultivated Northern berries

L. Klavins*, J. Kviesis and M. Klavins

Laboratory of Natural Products Research, University of Latvia, Jelgavas street 1, LV-1004 Riga, Latvia
*Correspondence: linards.klavins@lu.lv

Abstract:

Surface wax of plants is the outer layer, which protects the plant from dehydration, extreme temperatures, UV radiation and changes in the environment, as well as attacks from moulds and bacteria. Studies of berry surface wax are of importance to understand metabolism character (factors affecting wax layer composition in different berry species) as well as to increase the shelf life of berries and increase the microbial resistance. The aim of this study was analysis of surface wax composition of commercially grown 8 blueberry (Vaccinium corymbosum) varieties, wild bilberry (Vaccinium myrtillus L.) and bog bilberry (Vaccinium uliginosum L.). More than 80 different compounds were identified and quantified belonging to 9 groups of compounds, namely, alkanes, phytosterols, alcohols, fatty acids, phenolic acids, ketones, aldehydes, esters and tocopherols. Significant differences were found between blueberry (Vaccinium corymbosum) and bog bilberry (Vaccinium uliginosum L.) surface wax composition. Amongst studied berries differences were found in concentrations of triterpenes (up to 62% in blueberries), and fatty acids (up to 26% in bilberries) identifying species related differences influencing associated functional properties of berry wax (antimicrobial activity, stress caused by environmental changes). Blueberry variety ‘Polaris’ had the highest amount of ursolic acid (9.30 g 100 g-1), alpha-amyrin (11.07 g 100 g-1) and lupeol (10.2 g 100 g-1). Research on berry surface wax composition could help reduce loss of commercially produced berries due to environmental impacts or microbial attacks, prolonging shelf life and overall quality of fruits and vegetables post-harvest.

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917–928 K. Soots, T. Leemet, K. Tops and J. Olt
Development of belt sorters smoothly adjustable belt drums
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Development of belt sorters smoothly adjustable belt drums

K. Soots*, T. Leemet, K. Tops and J. Olt

Institute of Technology, Estonian University of Life Sciences, Fr.R. Kreutzwaldi 56, EE51014 Tartu, Estonia; *Correspondence: kaarel.soots@emu.ee

Abstract:

 Belt sorters are used to sort different type of objects according by their size. Making belt sorter easily and quickly adjustable in desired range has positive influence on it’s functionality and productivity. One solution for that is to use one or more adjustable belt drums. This option allows to change the distance between belts evenly and through this change the mesh size so to speak. Greater benefits will be obtained if belt drum is smoothly adjustable. The aim of this research paper is to compare technical peculiarities of two patented technical solutions for smoothly adjustable drum and identify if the newer has benefits compared with the older one. In this study comparative tests are performed using real prototypes. Both prototypes have key structure that determine the range of their adjustability. Prototype with older technical solution contains CNC milled key structure and prototype with improved solution contains 3D printed key structure. Prototype’s mechanical parameters like belt pulleys backlash relative to the fixing point, backlash between two neighboring belt pulleys and required torque to regulate slot width between belt pulleys are studied. Also, it is considered how both technical solutions influence the sorting quality. During this study different measuring instruments are used included laser scanner. Obtained results are used to develop better and more reliable technical solution for belt sorters that can be used in berry processing lines.

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161-170 K. Soots, V. Maksarov and J. Olt
Continuously adjustable berry sorter
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Continuously adjustable berry sorter

K. Soots¹*, V. Maksarov² and J. Olt¹

¹Institute of Technology, Estonian University of Life Sciences, Kreutzwaldi 56,
EE51014 Tartu, Estonia; *Correspondence: kaarel.soots@emu.ee
²Department of mechanical engineering National Mineral Resource University,
Vasilevsky island, 21 Line, House 2, 199106 St-Petersburg, Russia

Abstract:

The article has indicated the principle scheme for post-harvest processing of culturalberries according to the possibilities of the developed new berry sorter. The article tackles the constructive features of the post-harvest treatment of berries as well as of the belt sorter that functions on the principle of successive sorting method. The aim of study was to evaluate the technological features of the berry sorter, based on test results, and to determine problematic assemblies in the construction of the device. Continously adjustable gaps between pulleys as new technological solution for belt sorter was tested and initial results are presented in this article with future improvements. Initial results in this article show that novel continuously adjustable berry sorter functioned satisfactorily. The properties of berry fractions produced with novel berry sorter were possible to change with short time. It was also determined that settings to ensure highest berry fraction purity need to be clarify.

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