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The effectiveness of different blanching solutions upon French fries quality features was studied. Three Lithuanian bread potato cultivars Mirta, Vokë and Nida, cultivated in the experimental station of Vokë Branch (Lithuanian Institute of Agriculture) in 2001-2003 were chosen for the investigation. Chemical composition of potato tubers was determined in fresh mass by standard methods. Potato strips were blanched in the following solutions: 2% ascorbic acid in 60°C, 2% ascorbic acid in 20°C, 2% starch solution in 60°C, 2% NaCl solution in 60°C. The strips of potato were fried in the temperature of 180°C for 5-7 minutes in the edible oil. After 15 minutes the sensory evaluation of colour, texture, surface crispness, oiliness and the taste was carried on according to 5-point scale. The sensory properties of French fries depended on the type of blanching solution used as well as on the potato cultivar. French fries, made from potatoes of cv. Nida, were of the lightest and most attractive colour. Blanching in 2% starch solution darkened French fries colour and made their consistence and surface crispness worse but lowered their oiliness. The solutions of ascorbic acid, particularly used at the high temperature improved the surface crispness of French fries. Blanching of potato strips in 2% NaCl solution was profitable in regard to the consistence of French fries and surface crispness, particularly when cv. Mirta potatoes were used. However, the obtained products were characterized by too high oiliness. French fries made from tubers of cv. Vokë potatoes were of the best taste.
Introduction: In Lithuania, there is an insufficient attention to public education and to creating attitudes towards the quality of the consumed food. The aim: To find out how Lithuanian consumers assess food safety. Materials and methods: 466 respondents took part in the research. The questionnaires had been distributed at shopping centres. The results of questionnaires were processed by the SPSS. Respondents were split into the following age groups: 18-30; 31-40; 41-50; 51-60 and 61 years and older. Results of the survey were grouped by age. Results: The majority of respondents answered that “organic food is not necessary safe”. Most of the participants in 18-50 age groups claim that the letter E marks preservatives, but older than 51 stated that the letter E marked the food products approved by the EU. The press, Internet and the radio were more often mentioned as the source of information about healthy food and food additives by the participants of the age group of 41 years and older. The groups younger than 51 years old specified that the information received on food and additives was not sufficient. The majority of respondents thought that the main food safety risks were microorganisms, pesticides, and chemicals, BSE, while the 61 and older - that GMO, acrylamide, and irradiation. Conclusions: The research demonstrates that consumers are insufficiently informed on proper nutrition, safe food products, different food additives and pollutants that may pose a potential risk to public health. The present survey has the potential to form an opinion of how Lithuanian consumers assess the food safety. This study is low-budget and easy to analyse; moreover, we believe that it could be modified appropriately to fit the assessments and habits of other populations, too.
W ścisłych doświadczeniach polowych, przeprowadzonych w dwu miejscowościach w Polsce, o różnym położeniu nad poziomem morza, w latach 2006-2008, stwierdzono wpływ odmian ziemniaka, o różnym zabarwieniu skórki i miąższu na plon, cechy morfologiczne i cechy składu chemicznego bulw. Wyższym plonem ogólnym i handlowym cechowały się odmiany o żółtym niż kolorowym miąższu. Wyższą zawartością suchej masy, skrobi, białka ogólnego i właściwego, witaminy C i kwasu L-askorbinowego w bulwach, odznaczały się odmiany o kolorowym miąższu. Najwyższą koncentracją suchej masy, białka ogólnego właściwego wyróżniała się odmiana Valfi, skrobi - Shetland Black. Najwyższą zawartość witaminy C i kwasu askorbinowego stwierdzono u odmiany Blue Congo, o fioletowej skórce i fioletowym miąższu. Homologiczną zawartością tego składnika cechowały się odmiany: Shetland Black, Highland Burgundy Red i Valfi - o kolorowym miąższu bulw. U odmian o fioletowym i czerwonym zabarwieniu miąższu stwierdzono średnio wyższą zawartość tych składników niż u odmian o zabarwieniu żółtym. Badania nie wykazały wpływu lokalizacji doświadczeń na zawartość suchej masy, skrobi, białka właściwego, witaminy C i kwasu askorbinowego w bulwach.
Biodynamic (BD) preparations 500 and 501 are plant strengthening agents of the biodynamic agriculture method, prepared from cow manure and powdered quartz. The resulting products are highly diluted and sprayed on soil and plants. The main purpose of these preparations is to promote the processes of energy and nutrient cycling as well as to improve plant and soil quality parameters. This study was carried out in 2013-2014, in order to evaluate the influence of biodynamic preparations 500 and 501 on the chemical composition of potato tubers: amounts of dry matter, starch and mineral elements (potassium, magnesium, phosphorus and nitrogen). The experiment included two factors: I – three coloured potato (Solanum tuberosum L) cultivars (Vitelotte, Blue Congo - purple flesh and Red Emmalie - red flesh), II – treatment with BD preparations as field sprays (four treatments: 1. Control sample (without BD preparations); 2. BD preparation 500; 3. BD preparation 501; 4. A blend of two preparations (BD preparation 500 and BD preparation 501). The research revealed that BD preparations 500 and 501 had no significant effect on the content of dry matter and mineral element in coloured potato tubers in any of the experimental variants. However, BP preparation 501, as well as a combination of both 500 and 501 BP preparations, increased the starch content in potato tubers significantly (p<0.05). It was found that the quality indicators of potato tubers depended on the genetic characteristics of a cultivar. According to the two-year mean data, the significantly largest amounts of potassium (29.51 g kg-1 d.m.) and magnesium (1.475 g kg-1 d.m.) were accumulated in potato tubers of the cultivar Red Emmalie. Tubers of cv. Vitelotte accumulated the biggest amounts of dry matter (27.03 %) and starch (18.17 %).
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The ecological aspects in the potato tuber storage

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Over 2003 to 2005 in Lithuanian Agricultural University the laboratory research was carried out concerning the effect of caraway seed and dill seeds essentials oils on the storage of five potato cultivars. Research results showed that after 7 months of storage the smallest natural mass losses occured in potatoes of Goda cultivars, which were treated by plant inhibitors. The smallest mass of sprouts was observed in Nida cultivars treated by plant inhibitors.
The studies were conducted in 2005-2007 in Lithuanian University of Agriculture. The purpose of research was to establish the influence of mechanical injury of potato tubers on their quality. The experiment showed that during storage some chemical-physiological features had been changing constantly. The potatoes for research were grown under usual conditions in Vokė Branch Station (Lithuanian Institute of Agriculture) in Vilnius region in 2005-2007. For seven months (from September to April) potato tubers were stored in KX-Ю freezing chambers: 5-6°C, relative humidity - 90-95%. The studied samples of potatoes were stored in polythene bags of 120 µ thickness. General and natural weight losses were determined in 2 repetitions, two times: before storing and after seven months of storage. The analyses were carried out using standard methods: dry matter, saccharide content (reducing sugar and saccharose) and store losses of the mass. A suitable laboratorial bruising equipment was used (Fig. 1). The studied potato tubers were bruising from: 10 cm, 15 cm, 20 cm and 100 cm high. Research results showed that after 7 months of storage, all mechanically injured tubers demonstrated the lower content of dry matter as compared to the control sample. Tubers bruised from 100 cm height featured the highest losses of dry matter, whereas the lowest losses were characteristic for tubers bruised from 15 cm height. Tubers injured mechanically from 100 cm height and stored for 7 months demonstrated the greatest mass losses, whereas tubers bruised from 15 cm height featured the lowest mass losses.
While it is true that heavy metals accumulate in soil easily, their removal is difficult. The organic fraction of municipal solid waste can be recycled into compost, although frequent application of biowaste may lead to the accumulation of heavy metals in soil. There is no deep-rooted tradition in Lithuania to make and use various biowaste composts, including the ones produced from municipal waste. The objective of this study has been to compare the accumulation of heavy metals in different parts of oilseed pumpkin fruit depending on the chemical composition of the compost the pumpkin plants had been supplied. The content of heavy metals (HM) was determined in the soil before the plant-growing experiment, and in biowaste composts of different origin. Green waste (GW) and municipal solid waste (MSW) composts were applied to soil as fertiliser. Heavy metal concentrations in the skin, flesh and seeds of the analysed pumpkin fruits did not exceed the maximum permissible concentrations established by the EU norms. Seeds of the investigated pumpkin cultivar Olivia are more sensitive to the effect of heavy metal accumulation than the other morphological fruit parts (skin and flesh). The highest amounts of the investigated heavy metals, except Cr, were determined in the seeds, while the lowest ones, except Cu, in the flesh of oilseed pumpkin fruits. The amount of heavy metals in pumpkin biomass was not directly related to their concentrations in the soil, which proves the fact that the transfer of heavy metals from soil to plant is determined primarily by metal bioavailability and by a plant species.
This study aim to evaluate the distribution of bioactive compounds in the tubers of organically grown Jerusalem artichoke (JA) during the growing season in 2012–2014. Field experiments on the three JA cultivars: Albik, Rubik and Sauliai, were carried out at the organic farm in South Lithuania. The tubers were uprooted at the end of each month of the growing period (8 times) in March–June (spring period) and August– November (autumn period) and were analysed for the contents of dry matter, carbohydrates, phenolic compounds, leuco-anthocyanins, catechins. The significantly highest dry matter content in JA tubers was determined in March of 2014 after they had been exposed to sub-zero temperatures in the soil during the winter, while the amount of phenolic compounds – at the beginning of the spring growing period. The significantly highest content of inulin in October of 2014 was accumulated in the tubers of cv. Sauliai (46.08%), carbohydrates – in Albik tubers in September of 2014 (44.23%), when the formation of new tubers began. Significantly higher amounts of catechins were determined in the second half of the growing period. Cultivar and organogenesis stage had a significant impact on the content of leuco-anthocyanins in JA tubers. Substantial differences in the content of leuco-anthocyanins among the tested cultivars were determined at the end of the growing season.
The aim of this 3-year study was to determine the influence of harvest time on dry matter, total dietary fibre, fractional composition of dietary fibre (acid detergent fibre (ADF) and neutral detergent fibre (NDF)), water-soluble carbohydrates (WSCs) and inulin content in tubers of different cultivars of Jerusalem artichoke (Helianthus tuberosus L.): ‘Rubik’, ‘Albik’ and ‘Sauliai’. The tubers were harvested in spring (March and April) and autumn (October and November). Our study shows that the largest amount of WSC to exist in ‘Rubik’ tubers harvested especially during October. In contrast, the largest amount of total dietary fibres and their fractions (NDF and ADF) accumulated in ‘Albik’ tubers during the spring harvest month (April). The largest amount of inulin was obtained from ‘Sauliai’ tubers harvested in October. Based on our results, it is advisable to use the ‘Sauliai’ tubers from the harvest time during October to obtain the largest amount of inulin.
The objective of the three-year study was to determine the influence of postharvest storage on essential and nonessential amino acids content in tubers of different cultivars of Jerusalem artichoke (Helianthus tuberosus L.) – ‘Rubik’, ‘Albik’ and ‘Sauliai’. The experiment was performed in 2007–2009. The plants were grown in the experimental field of Lithuanian University of Agriculture in Kaunas (from 2011 August – Aleksandras Stulginskis university). The Jerusalem artichoke tubers were stored for 20 weeks at the temperature of 2°C (± 0.5°C) and RH 90–95 % in polypropylene (PP) perforated bags, capacity of 10 kg, in 4 replicates. Amino acids contents were determined immediately after harvest and during storage of the tubers in every 4 weeks by the method of ion-exchange chromatography and then detected photometrically. The data obtained were statistically analyzed with two-factor Anova (STATISTICA software). Standard deviation and the least significant difference at the 95% probability level were calculated with Fisher’s LSD test. Data presented in tables are mean values of the three years of the experiment. The results obtained showed that directly after harvest and during the storage the dominating amino acid in tubers of all cultivars was of essential amino acids – arginine, and of nonessential – asparagine, glutamine and alanine. Tubers of cv. ‘Sauliai’ after 20 week storage accumulated the highest amount of essential amino acids – treonine, valine, isoleucine, leucine, phenylalanine and nonessential – serine, glycine, alanine, tyrosine. Significant correlations between contents of some amino acids in the tubers were found.
Harvested potatoes and pumpkins are usually stored before processing or consumption. This makes it critical to understand the effect of storage on the chemical composition changes in these products. Prolonged storage can cause a decrease/increase or maintain the level of some nutrient. The objective of this study was to investigate the changes in chemical composition during storage of the great pumpkin cvs. ‘Justynka F1 ’, ‘Karowita’, ‘Amazonka’ fruit flesh and the coloured fleshed potato cvs. ‘Blue Congo’, ‘Vitelotte’ and ‘Blue Danube’ tubers. Standard methods were applied to determine the following: dry matter, crude fibre, crude ash and weight loss. After four months of storage, the dry matter content significantly increased in all potato cultivars tubers. The largest increase in dry matter was measured in tubers of ‘Blue Congo’ (2.34%). During storage, crude ash content changed non-significantly in all cultivars. Crude fibre content decreased significantly in ‘Blue Danube’ (1.02%) and ‘Vitelotte’ (0.50%) tubers. After four months of storage the largest weight losses were found in tubers of ‘Vitelotte’. After storage period dry matter significantly decreased in all tested pumpkin cultivars. The maximum dry matter and weight loss decrease was found in flesh of ‘Justynka F1 ’ (5.36%). The content of crude ash tended to increase in flesh of all cultivars, but no significant differences were found before and after storage period. Crude fibre content significantly decreased in all pumpkin cultivars. The highest crude fibre decrease was found in flesh of ‘Justynka F1 ’ (17.05%).
Oil pumpkin (Cucurbita pepo L. var. styriaca) seeds and Jerusalem artichoke (Helianthus tuberosus L.) tubers are alternative horticultural products containing important biologically active components. The objective of the three-year study was to determine dry matter and micro-, macroelements accumulation in seeds of oil pumpkin Cucurbita pepo L. var. styriaca – ‘Miranda’, ‘Golosemiannaja’, ‘Herakles’, ‘Danaja’, ‘Olga’; and in tubers of Jerusalem artichoke (Helianthus tuberosus L.) –‘ Rubik’, ‘Albik’, ‘Sauliai’ and selection lines Nr. 05-1, Nr. 05-7. Macro- and microelements were determined by mass spectrometer. The highest amount of Ca, K, Fe, Mn, Se and Al was accumulated in oil pumpkin seeds of cv. ‘Miranda’ and amount of Ca, Mg and Se was identified in cv. ‘Rubik’ and K, Na, in ‘Albik’ Jerusalem artichoke tubers.
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