scholarly journals A tárolási feltételek hatása a kukorica Fusarium fertőzöttségére és toxin szennyezettségére

2002 ◽  
pp. 28-32
Author(s):  
Edina Veres ◽  
Mária Borbély ◽  
Zoltán Győri ◽  
János Kátai
Keyword(s):  
Moisture Content ◽  
Ecological Factors ◽  
Storage Conditions ◽  
Hplc Method ◽  
Effect Of Temperature ◽  
Dilution Method ◽  
Microscopic Fungi ◽  
Toxin Content ◽  
Higher Temperature ◽  
Temperature Storage

Corn samples harvested in 1997, 1998 and 1999 from different soil types were stored at different conditions (temperature, moisture content, state of kernels) for six months. The Fusarium contamination was examined by plate dilution method and the amount of mycotoxins (F-2, T-2, HT-2, DON, DAS) were determined applying HPLC method immediately after harvesting and in the third and sixth month of storage. The aim of our study was to find correlation between the ecological factors, storage conditions and the examined parameters mentioned above, as well as to prove them statistically. According to the examinations carried out after harvesting we could state that the soil type had no effect on the parameters. Analysing the effect of the years we found considerable differences. The Fusarium infection of corn samples in 1998, while the toxin contamination in 1999 was the highest. The results of storage experiment show that year (number of microscopic fungi, F-2, T-2, HT-2, DAS and total toxin content) and moisture content of kernels (F-2, T-2, and total toxin content) have a significant effect on the examined parameters. We could prove the effect of temperature on the T-2 content (samples with natural moisture content) and DON content (samples with 14% moisture content). Higher values were found at higher temperature storage. The ratio of damaged kernels influenced the DON concentration in the non- wetted samples and the number of microscopic fungi in the wetted samples.

scholarly journals EFFECT OF TEMPERATURE STORAGE ON THE CONTENT OF VITAMIN A IN MONOFLORAL POLLEN POLLEN

2020 ◽  
pp. 55-61
Author(s):  
Л.А. РЕПЬЕВА
Keyword(s):  
Vitamin A ◽  
Storage Period ◽  
Storage Conditions ◽  
Biological Properties ◽  
Effect Of Temperature ◽  
Federal State ◽  
Pollen Load ◽  
Botanical Origin ◽  
Temperature Conditions ◽  
Temperature Storage

Проблема и цель. В статье представлены результаты влияния различных температурных режимов хранения на содержание витамина А в образцах монофлерной пыльцевой обножки. Целью исследования было сравнительное изучение влияния температурных режимов на содержание витамина А в образцах монофлерной пыльцевой обножки. Методология. Для проведения эксперимента были использованы образцы пыльцевой обножки, собранные на пасеках Рязанской области. Заготовленные, высушенные образцы поместили на хранение в течение 3, 6 и 12 месяцев при разных температурных режимах (+18ºC, +5ºC и -18ºC).По истечении каждого срока хранения образцы были исследованы на содержание витамина А. Исследования проводились в научно-исследовательской лаборатории ФГБНУ «ФНЦ пчеловодства».Определение содержания витамина А выполнено согласно ГОСТ 34253-2017 Продукты пчеловодства. Метод определения витамина А. Результаты. В результате исследования было подтверждено, что при хранении наблюдается снижение содержания витамина А во всех пяти образцах монофлерной пыльцевой обножки. Полученные результаты свидетельствуют о том, что наибольшее содержание витамина А принадлежит образцам, которые хранились при температуре -18ºC; оно составило в среднем 85,2+4,1% от первоначального значения. Разброс значений витамина А зависел от ботанического происхождения образцов. Так, в образце №3 (Одуванчик лекарственный Taraxacum ofcinale Wigg) наблюдалось наибольшее количество витамина А, тогда как у образца №4 (Синяк обыкновенный Echium vulgare.) этот показатель минимальный из показателей всех представленных образцов. Заключение. Полученные результаты свидетельствуют о том, что хранение пыльцевой обножки в условиях отрицательных температур способствует наибольшему сохранению витамина А. Видовая принадлежность пыльцевой обножки является определяющим фактором ее химического состава и активности биологических свойств. Problem and purpose. The article presents the results of the infuence of diferent temperature storage conditions on the content of vitamin A in samples of monoforal pollen load. The purpose of the study was to compare the efect of temperature conditions on the content of vitamin A in samples of monoforal pollen load. Methodology. For the experiment, samples of pollen load collected in apiaries of Ryazan region were used. The prepared, dried samples were stored for 3, 6 and 12 months at diferent temperature conditions (+18º C, +5º C and -18º C). At the end of each storage period, the samples were tested for vitamin A content. The study took place in the research laboratory of Federal State Budgetary Research Center of Beekeeping. Vitamin A content was determined in accordance with GOST 34253-2017 Bee products. Method for determining vitamin A. Results. As a result of the study, it was confrmed that when storage, there was a decrease in the content of vitamin A in all fve samples of monoforal pollen load. The results showed that the highest content of vitamin A belonged to the samples that were stored at a temperature of -18° C and averaged 85.2+4.1 % of the original value. The variation in vitamin A values depended on the botanical origin of the samples. For example, sample 3 (Dandelion Taraxacum ofcinale Wigg) had the highest amount of vitamin A, while sample 4 (viper's bugloss, Echium vulgare) had the lowest amount of all the samples. Conclusion. The results obtained indicate that the storage of pollen load in conditions of negative temperatures contributes to the greatest preservation of vitamin A. The botanical origin of pollen load is a determining factor in its chemical composition and activity of biological properties.

scholarly journals Effect of Temperature and Time Storage to pH and Color Changes of Palm Sap (Arenga pinnata Merr) after Tapping

2019 ◽  
Vol 8 (1) ◽  
pp. 40
Author(s):  
Ansar Ansar ANSAR
Keyword(s):  
Storage Time ◽  
Effect Of Temperature ◽  
Color Changes ◽  
Quality Degradation ◽  
Environment Temperature ◽  
Higher Temperature ◽  
Ph Decrease ◽  
And Storage ◽  
Storage Temperatures ◽  
Temperature Storage

Flos masculus at palm can be produced a palm sap after tapping process. Palm sap have quality degradation due to effect environment temperature. The purpose of the study was to evaluate the effect of temperature and storage time to changes pH and color of palm sap after tapping. The research samples were obtained from farmers in Pusuk, West Lombok, NTB. The research parameters were observed is changes pH and color of palm sap during storage. The sample of the research was storaged at temperature variation of 10, 29, and 40oC, and then observed each 2 until 10 hour. The results of the research showed the temperature and time storage was affected to pH and color palm sap after tapping. After 10 hour pH of palm sap changed from 7.0 to 2.6 at temperature of 40oC, 4.8 at temperature of 29oC, and 6.6 at temperature of 10oC. Palm sap which storage at temperature 10oC has pH quality decrease is lowest than at temperature of 29 and 40oC. The higher temperature storage, the bigger pH decrease. The pH decreases, the L* and b* values also decrease significantly, but the value of a* does not change significantly at various storage temperatures. 

scholarly journals Combined Effect of Temperature and Relative Humidity on the Survival of Salmonella Isolates on Stainless Steel Coupons

2022 ◽  
Vol 19 (2) ◽  
pp. 909
Author(s):  
Amreen Bashir ◽  
Peter A. Lambert ◽  
Yvonne Stedman ◽  
Anthony C. Hilton
Keyword(s):  
Stainless Steel ◽  
Relative Humidity ◽  
Storage Conditions ◽  
Effect Of Temperature ◽  
Inactivation Kinetics ◽  
Survival Curves ◽  
Weibull Models ◽  
Higher Temperature ◽  
Modified Weibull ◽  
Log Linear

The survival on stainless steel of ten Salmonella isolates from food factory, clinical and veterinary sources was investigated. Stainless steel coupons inoculated with Salmonella were dried and stored at a range of temperatures and relative humidity (RH) levels representing factory conditions. Viability was determined from 1 to 22 days. Survival curves obtained for most isolates and storage conditions displayed exponential inactivation described by a log-linear model. Survival was affected by environmental temperatures and RH with decimal reduction times (DRTs) ranging from <1 day to 18 days. At 25 °C/15% RH, all isolates survived at levels of 103 to 105 cfu for >22 days. Furthermore, temperatures and RH independently influenced survival on stainless steel; increasing temperatures between 10 °C and 37 °C and increasing RH levels from 30–70% both decreased the DRT values. Survival curves displaying a shoulder followed by exponential death were obtained for three isolates at 10 °C/70% RH. Inactivation kinetics for these were described by modified Weibull models, suggesting that cumulative injury occurs before cellular inactivation. This study highlights the need to control temperature and RH to limit microbial persistence in the food manufacturing environment, particularly during the factory shut-down period for cleaning when higher temperature/humidity levels could be introduced.

scholarly journals Quality Parameters of Six Cultivars of Blueberry Using Computer Vision

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Silvia Matiacevich ◽  
Daniela Celis Cofré ◽  
Patricia Silva ◽  
Javier Enrione ◽  
Fernando Osorio
Keyword(s):  
Computer Vision ◽  
Relative Humidity ◽  
Moisture Content ◽  
Storage Conditions ◽  
Quality Parameters ◽  
Simple Method ◽  
Alternative Approach ◽  
Subjective Measurements ◽  
Higher Temperature ◽  
Standard Techniques

Background. Blueberries are considered an important source of health benefits. This work studied six blueberry cultivars: “Duke,” “Brigitta”, “Elliott”, “Centurion”, “Star,” and “Jewel”, measuring quality parameters such as °Brix, pH, moisture content using standard techniques and shape, color, and fungal presence obtained by computer vision. The storage conditions were time (0–21 days), temperature (4 and 15°C), and relative humidity (75 and 90%).Results. Significant differences (P<0.05) were detected between fresh cultivars in pH, °Brix, shape, and color. However, the main parameters which changed depending on storage conditions, increasing at higher temperature, were color (from blue to red) and fungal presence (from 0 to 15%), both detected using computer vision, which is important to determine a shelf life of 14 days for all cultivars. Similar behavior during storage was obtained for all cultivars.Conclusion. Computer vision proved to be a reliable and simple method to objectively determine blueberry decay during storage that can be used as an alternative approach to currently used subjective measurements.

Nucleation of Disorder in Fe3Al Alloys

1967 ◽  
Vol 25 ◽  
pp. 312-313
Author(s):  
P. R. Swann ◽  
W. R. Duff ◽  
R. M. Fisher
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Annealing Temperature ◽  
Antiphase Domain ◽  
Effect Of Temperature ◽  
Domain Structures ◽  
Transmission Electron ◽  
Domain Boundaries ◽  
Higher Temperature ◽  
The One

Recently we have investigated the phase equilibria and antiphase domain structures of Fe-Al alloys containing from 18 to 50 at.% Al by transmission electron microscopy and Mössbauer techniques. This study has revealed that none of the published phase diagrams are correct, although the one proposed by Rimlinger agrees most closely with our results to be published separately. In this paper observations by transmission electron microscopy relating to the nucleation of disorder in Fe-24% Al will be described. Figure 1 shows the structure after heating this alloy to 776.6°C and quenching. The white areas are B2 micro-domains corresponding to regions of disorder which form at the annealing temperature and re-order during the quench. By examining specimens heated in a temperature gradient of 2°C/cm it is possible to determine the effect of temperature on the disordering reaction very precisely. It was found that disorder begins at existing antiphase domain boundaries but that at a slightly higher temperature (1°C) it also occurs by homogeneous nucleation within the domains. A small (∼ .01°C) further increase in temperature caused these micro-domains to completely fill the specimen.

Barley seed storage under controlled conditions

2019 ◽  
pp. 140-150 ◽  
Author(s):  
O. A. Zadorozhna ◽  
T. P. Shyianova ◽  
M.Yu. Skorokhodov
Keyword(s):  
Hordeum Vulgare ◽  
Moisture Content ◽  
Spring Barley ◽  
Seed Storage ◽  
Growing Season ◽  
Storage Conditions ◽  
Meteorological Conditions ◽  
Hordeum Vulgare L ◽  
The Relationship ◽  
And Storage

Seed longevity of 76 spring barley gene pool samples (Hordeum vulgare L. subsp. distichon, convar. distichon: 56 nutans Schubl., two deficience (Steud.) Koern., two erectum Rode ex Shuebl., two medicum Koern.; convar. nudum (L.) A.Trof.: one nudum L. та subsp. vulgare: convar. vulgare: nine pallidum Ser., three rikotense Regel.; convar. coeleste (L.) A.Trof.: one coeleste (L.) A.Trof.) from 26 countries, 11 years and four places of reproduction was analyzed. Seeds with 5–8% moisture content were stored in chamber with unregulated and 4oC temperature. The possibility of seed storage under these conditions for at least 10 years without significant changes in germination has been established. The importance of meteorological conditions in the formation and ripening of seeds for their longevity is confirmed. The relationship between the decrease of barley seeds longevity and storage conditions, amount of rainfall, temperature regime during the growing season of plants is discussed.

scholarly journals Potential for the Postharvest Biological Control of Phthorimaea operculella (Lepidoptera, Gelechiidae) by Blattisocius tarsalis (Mesostigmata, Blattisociidae)

Agronomy ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 288
Author(s):  
Jorge Gavara ◽  
Ana Piedra-Buena ◽  
Estrella Hernandez-Suarez ◽  
Manuel Gamez ◽  
Tomas Cabello ◽  
...  
Keyword(s):  
Low Temperatures ◽  
Storage Conditions ◽  
Control Agent ◽  
Phthorimaea Operculella ◽  
Effect Of Temperature ◽  
Potato Storage ◽  
Release Rates ◽  
Blattisocius Tarsalis ◽  
Predatory Capacity ◽  
Pest Density

Phthorimaea operculella is one of the most important pests causing damage to stored potatoes. In this work, the effect of temperature (at 10, 20 and 30 °C) on the predation of pest eggs by Blattisocius tarsalis was studied in the laboratory. In addition, the effect of three predatory release rates on two pest densities was studied under microcosm conditions. The results showed that B. tarsalis maintains its predatory capacity at low temperatures (10 °C), obtaining an efficiency of 49.66 ± 5.06% compared to the control. In turn, at 20 °C, a maximum efficacy of 78.17 ± 4.77% was achieved, very similar to that presented at 30 °C (75.57 ± 4.34%). Under microcosm conditions and at low pest density (10 eggs/container), the mortality due to the mite was 96.97 ± 3.03%, 81.82 ± 8.84%, and 84.85 ± 8.30%, respectively, for the three predatory release rates (5, 10 or 20 mites/container). At the high infestation level, the pest control ranged from 61.54 ± 9.21% to 92.31 ± 2.74%, depending on the predatory release rate. The results obtained show that B. tarsalis could be a relevant control agent against P. operculella under non-refrigerated potato storage conditions, as well as in the first stages of their storage under refrigerated conditions.

Effect of Different Storage Conditions on Soybean Oil Acid Value

2014 ◽  
Vol 962-965 ◽  
pp. 1235-1238
Author(s):  
Mei Mei Hao ◽  
Xi Hong Li ◽  
Hai Dong Liu ◽  
Wei Qiao Yang ◽  
Chong Xiao Shao ◽  
...  
Keyword(s):  
Moisture Content ◽  
Soybean Oil ◽  
Acid Value ◽  
Storage Condition ◽  
Storage Conditions

Under the condition of nine kinds of storage, In this thesis, through the determination of acid value of soybean oil, to search for the best storage condition, used to prevent the soybean oil acid value rise, through the analysis of the acid value data, We find the best storage condition, is 0°C, 6% moisture content, and PVC plastic wrap packaging.

Effect on Cs removal of solid-phase metal oxidation in metal ferrocyanides

2017 ◽  
Vol 105 (12) ◽  
Author(s):  
Keun-Young Lee ◽  
Jimin Kim ◽  
Maengkyo Oh ◽  
Eil-Hee Lee ◽  
Kwang-Wook Kim ◽  
...  
Keyword(s):  
Treatment Process ◽  
Solid Phase ◽  
Storage Conditions ◽  
Radioactive Cesium ◽  
Metal Oxidation ◽  
Aging Period ◽  
Higher Temperature ◽  
Increasing Temperature ◽  
And Storage ◽  
Cobalt And Nickel

AbstractMetal ferrocyanides (MFCs) have been studied for many years and are regarded as efficient adsorbents for the selective removal of radioactive cesium (Cs) from contaminated aqueous solutions. Although their efficiency has been demonstrated, various investigations on the physicochemical, thermal, and radiological stability of the solids of MFCs are required to enhance the applicability of MFCs in the treatment process. We observed that the Cs adsorption efficiencies of cobalt and nickel ferrocyanides decreased as their aging period increased, while the Cs adsorption efficiencies of copper and zinc ferrocyanides did not decrease. The tendencies of these ferrocyanides were accelerated by exposure of the solids at a higher temperature for a longer time. Our comprehensive analyses demonstrated that only the oxidizable metals in the MFCs can be oxidized by aging time and increasing temperature; also, this affects the Cs removal efficiency by decreasing the exchangeable sites in the solids. The chemical stability of MFCs is very important for the optimization of the synthesis and storage conditions.

Sign in / Sign up

Export Citation Format

Share Document