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Sirvi Autor "Libek, Asta-Virve" järgi

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  • Pisipilt
    Kirje
    Comparison of polyphenols and anthocyanin content of different blackcurrant (Ribes nigrum L.) cultivars at the Polli Horticultural Research Centre in Estonia
    (2020) Kikas, Ave; Rätsep, Reelika; Kaldmäe, Hedi; Aluvee, Alar; Libek, Asta-Virve; Estonian University of Life Sciences. Institute of Agricultural and Environmental Sciences. Polli Horticultural Research Centre; Estonian University of Life Sciences. Institute of Veterinary Medicine and Animal Sciences. ERA Chair for Food (By-) Products Valorisation Technologies
    The evaluation of blackcurrant cultivars and their fruit properties at the Polli Horticultural Research Centre has been active since 1945. In addition to the assessment of biological and economic properties of cultivars, it is essential to pay attention to fruit quality. In 2014, the laboratory building of Polli Horticultural Research Centre was reconstructed within the PlantValor competence centre project, enabling to introduce HPLC methods for the determination of polyphenolic compounds in fruit quality analysis. In 2017 and 2018, the fruit quality of 37 blackcurrant cultivars of different geographical origin (Belarus, Estonia, Finland, Latvia, Lithuania, Norway, Poland, Russia, Scotland, Sweden and Ukraine) was analysed. All cultivars were grown in the genetic resources collection (2008–2019) located at the Polli Horticultural Research Centre. The main aim of the study was to analyse the content of polyphenols and anthocyanins for selecting suitable blackcurrant genotypes for breeding programmes, fruit production and possible product development. In two consecutive years of the study, the total polyphenols content in the fruits of different cultivars varied 290–634 mg 100 g-1 fresh weight (fw) and the anthocyanins 183–471 mg 100 g-1 fw.
  • Pisipilt
    Kirje
    Sinise kuslapuu (Lonicera caerulea L.) sortide töötlemisviiside võrdlus
    (Eesti Maaülikool; Maaelu Teadmuskeskus, 2026) Laurson, Peeter; Klakotskaya, Natallia; Libek, Asta-Virve; Kikas, Ave; Eesti Maaülikool. Põllumajandus- ja keskkonnainstituut. Polli aiandusuuringute keskus
    Blue honeysuckle (Lonicera caerulea L.) is a relatively underutilized berry crop valued for its high content of bioactive compounds and good winter hardiness. This study compared the juice yield of fresh and thawed frozen fruits of four cultivars — ‘Vostorg’, ‘Jugana’, ‘Boreal Blizzard’, and ‘Boreal Beauty’. The fruits were mechanically harvested in 2025 at the Polli Horticultural Research Centre. Juice was extracted using a hydraulic water press (3 kg cm⁻², 10 min) for fresh samples and a texture analyser (200 N, 5 min) for thawed frozen samples, with three replicates per cultivar. Total soluble solids (TSS, °Brix) and titratable acidity (TA, %) were also determined. Juice yield from fresh fruit ranged from 43.3% (‘Boreal Beauty’) to 48.6% (‘Jugana’), whereas juice yield from thawed frozen fruit was significantly higher, ranging from 66.0% to 70.2%, corresponding to an average yield increase of 49.6%. The cultivar ‘Jugana’ produced the highest yield under both extraction methods. The soluble solids content ranged from 13.0 to 14.5 °Brix, with the highest values recorded for ‘Vostorg’ and ‘Jugana’. Titratable acidity ranged from 1.58% to 2.49%, with the highest acidity observed in juice from ‘Boreal Beauty’. Juice yield from thawed frozen fruit exceeded values reported in the literature, whereas yield from fresh fruit was lower than previously reported. Overall, the results demonstrate that pressing thawed fruit increases juice yield by nearly 50% compared with fresh fruit. The cultivars also differed in juice yield, indicating the importance of cultivar selection for industrial processing. These findings provide a basis for more accurate planning of blue honeysuckle juice production and highlight the need for further comparative studies.
  • Pisipilt ei ole saadaval
    Kirje
    Supplementary table for Kaldmäe et al. in the International Journal of Fruit Science with the title Influence of pollination conditions on fruit set of selected blackcurrant genotypes and recently released cultivars
    (Estonian University of Life Sciences, 2022) Libek, Asta-Virve; Kikas, Ave; Kaldmäe, Hedi; Arus, Liina
    Data collection 2006-2007. Fruit set of blackcurrant (Ribes nigrum L.) cultivars ‘Almo’, ‘ Ats’, ‘ Elo’, and ‘ Karri’ and four breeder's selections was investigated under open pollination, artificial, and natural self-pollination conditions in 2006–2007.
  • Pisipilt
    Kirje
    Terve loom ja tervislik toit : konverentsi "Terve loom ja tervislik toit 2017" postrid
    (Eesti Maaülikool, 2017) Mõtus, Kerli; Viltrop, Arvo; Emanuelson, Ulf; Raudsepp, Piret; Libek, Elmo; Rätsep, Reelika; Kikas, Ave; Libek, Asta-Virve; Arus, Liina; Kaldmäe, Hedi; Bleive, Uko; Ausmees, Kristo; Ehrlich-Peets, Kersti; Vallas, Mirjam; Veskioja, Andre; Rammul, Kadi; Rehema, Aune; Zilmer, Mihkel; Songisepp, Epp; Kullisaar, Tiiu; Karis, Priit; Jaakson, Hanno; Ling, Katri; Ilves-Luht, Aire; Samarütel, Jaak; Valdmann, Andres; Reimann, Ene; Pärn, Pille; Bruckmaier, Rupert M.; Gross, Josef; Kaart, Tanel; Ots, Meelis; Valdmann, Merle; Valdmann, Andres; Leming, Ragnar; Kaasik, Allan; Kruus, Eha; Lauringson, Enn; Põldma, Priit; Timonen, Anri Aino Elisa; Katholm, Jørgen; Petersen, Anders; Kalmus, Piret; Reimus, Kaari; Orro, Toomas; Emanuelson, Ulf; Niine, Tarmo; Lassen, Brian; Mäesaar, Mihkel; Roasto, Mati; Runin, Maksim; Olt, Andres; Mark, Elina; Pärn, Pille; Kurõkin, Jevgeni; Kavak, Ants; Reilent, Andres; Jaakma, Ülle
    Kerli Mõtus, Arvo Viltrop, Ulf Emanuelson. Ammlehmade farmis hukkumise riskitegurid ekstensiivse pidamisviisiga lihaveisekarjades.