Tag Archives: potatoes

1546-1554 R. Zarins, Z. Kruma, L. Tomsone, S. Kampuse, I. Skrabule and I.H. Konosonoka
Comparison of phenolic compounds and antioxidant activity of fresh and freeze-dried potatoes
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Comparison of phenolic compounds and antioxidant activity of fresh and freeze-dried potatoes

R. Zarins¹, Z. Kruma¹*, L. Tomsone¹, S. Kampuse¹, I. Skrabule² and I.H. Konosonoka²

¹Latvia University of Agriculture, Faculty of Food Technology, Department of Food Technology, Rigas iela 22, LV-3004 Jelgava, Latvia
²Institute of Agricultural Resources and Economics, Zinātne iela 2, Priekuli, Priekuli municipality, LV-4126 Latvia
*Correspondence: zanda.kruma@llu.lv

Abstract:

Potatoes (Solanum tuberosum L.) contain a wide range of compounds with health benefits, and different techniques have been developed for the determination of these compounds. Freeze-drying is a common method for the preservation and preparation of samples for the analyses of bioactive compounds, but it is well known that drying influences the composition of food products. The aim of the current study was to compare phenolic compounds and antioxidant activity of fresh and freeze-dried potatoes. In the experiment 11 cultivar potatoes grown in experimental fields of the Institute of Agricultural Resources and Economics in 2016 were analysed. Potatoes were freeze-dried. Homogenized fresh and freeze-dried samples were extracted with an ethanol/water (80/20 w/w) solution. Total phenolic content (TPC) was determined using the Folin-Ciocalteu method, and the antioxidant activity was evaluated using 2,2-diphenyl-1-picrylhydrazyl (DPPH˙) and 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) assays. The highest TPC and radical scavenging activity were determined in cultivars ‘Peru Purple’ and ‘Blue Congo’ potatoes. Freeze-drying influenced all the tested parameters but more significantly the TPC, and for certain cultivars a reduction of more than 30% was observed. A strong correlation between TPC, DPPH and ABTS in fresh and freeze-dried samples was observed, r = 0.81, r=0.93, r = 0.92, respectively. It could be concluded that the effect of freeze-drying on TPC and antioxidant activity is cultivar dependent.

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044–054 V. Bulgakov, S. Ivanovs, V. Adamchuk and Y. Ihnatiev
Investigation of the influence of the parameters of the experimental spiral potato heap separator on the quality of work
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Investigation of the influence of the parameters of the experimental spiral potato heap separator on the quality of work

V. Bulgakov¹, S. Ivanovs²*, V. Adamchuk³ and Y. Ihnatiev⁴

¹National University of Life and Environmental Sciences of Ukraine, 15, Heroyiv Obrony str., UK 03041 Kyiv, Ukraine
²Latvia University of Agriculture, 2, Liela str., LV 3001 Jelgava, Latvia
³National Scientific Centre ‘Institute for Agricultural Engineering and Electrification’ of Ukraine, 11, Vokzalna str., Glevaha-1, UK 08631 Kiev Region, Ukraine
⁴Tavria State Agrotechnological University, 18, Khmelnytskoho pr., Melitopol, UK 72312 Zaporozhye region, Ukraine
*Correspondence: semjons@apollo.lv

Abstract:

The known designs of potato heap cleaners have a series of disadvantages, particularly on sticky soils. In the newly developed and patented potato heap cleaner of a spiral type there is used the vibration effect and other technical solutions which ensure efficient self-cleaning of the rollers. Laboratory-field equipment was worked out and made for the investigations which had a spiral potato heap cleaner of a new design mounted on it. Under the field conditions the real technological process of digging and cleaning of the potato tubers from the soil admixtures was simulated in one row of the potato plantation. By using the developed methodology of a multi-factor experiment dependencies were obtained characterising the impact of the design and kinematic parameters of the cleaner itself upon the quality indicators of its operation (the soil separation efficiency, the cleanness of the heap, the damage and losses of the tubers), allowing optimisation of the design.

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