Authors:Adnan Eser, Hajnalka Kató, Laura Kempf, and Márton Jolánkai
Water availability is one of the major physiological factors influencing plant growth and development. An assessment study has been done at the Szent István University, Gödöllő to evaluate and identify the water footprint of protein yield of field crop species. Twelve field crop species (Sugar beet Beta vulgaris, spring and winter barley Hordeum vulgare, winter wheat Triticum aestivum, maize Zea mays, sunflower Helianthus annuus, peas Pisum sativum, potato Solanum tuberosum, alfalfa Medicago sativa, oilseed rape Brassica napus, rye Secale cereale and oats Avena sativa) were involved in the study. Evapotranspiration patterns of the crops studied have been identified by the regular agroclimatology methodology and physiologically reliable protein ranges within crop yields were evaluated.
The results obtained suggest, that water footprint of cereals proved to be the lowest, however maize values were highly affected by the high variability of protein yield. Oilseed crops had considerably high protein yield with medium water efficiency. Alfalfa, potato and sugar beet water footprints were in accordance with their evapotranspiration patterns.
Protein based water footprint assessment seems to be more applicable in crop species evaluations than that of yield based methodologies.
Authors:Simona Clichici, C. Catoi, T. Mocan, A. Filip, C. Login, A. Nagy, D. Daicoviciu, N. Decea, C. Gherman, R. Moldovan, and Adriana Muresan
Oxidative stress is related to the liver fibrosis, anticipating the hepatic stellate cells’ (HSC) activation. Our aim was to correlate oxidative stress markers with the histological liver alterations in order to identify predictive, noninvasive parameters of fibrosis progression in the evolution of toxic hepatitis.CCl4 in sunflower oil was administered to rats intragastrically, twice a week. After 2, 3, 4 and 8 weeks of treatment, plasma levels of malondialdehyde (MDA), protein carbonyls (PC), hydrogen donor capacity (HD), sulfhydryl groups (SH), and glutathione (GSH) were measured and histological examination of the liver slides was performed. Dynamics of histological disorders was assessed by The Knodell score. Significant elevation of inflammation grade was obtained after the second week of the experiment only (p=0.001), while fibrosis started to become significant (p=0.001) after 1 month of CCl4 administration. Between plasma MDA and liver fibrosis development a good correlation was obtained (r=0.877, p=0.05). Correlation between PC dynamics and liver alterations was marginally significant for inflammation grade (r=0.756, p=0.138). HD evolution revealed a marginally inverse correlation with inflammation grade (r=−0.794, p=0.108). No correlations could be established for other parameters with either inflammation grade or fibrosis stage.Our study shows that MDA elevation offers the best prediction potential for fibrosis, while marginal prediction fiability could be attributed to high levels of plasma PC and low levels of HD.
Authors:J. Tarek-Tilistyák, M. Juhász-Román, J. Jekő, and E. Máthé
We evaluated the microbiological safety, the short-term storability, and the macronutrients of oil seed cake (OSC) obtained from walnut (WnC), linseed (LC), and sunflower seed with hull (SC). The OSCs had 3.6–5.8% moisture content, 0.50–0.60 water activity (aw), 29.9–39.4% protein, 15.5–23.6% fat, and 36.6–48.0% dietary fibre content. The grinded OSCs could be stored in opaque plastic bags for 4 months at temperatures of 4 °C, 14 °C, and 25 °C. Total colony count of mesophilic microorganisms depending on oxygen demand and spore-forming ability, and faecal indicator microorganisms were determined during a 4-month storage term at 4 °C, 14 °C, and 25 °C using traditional culturing methods. The OSCs were free from sulphite-reducing Clostridia and coliforms, including Escherichia coli. Data were analyzed statistically by multifactor analysis of variance. Ascending order of the average contamination of the three products (log10 CFU g−1) was aerobic sporogenic bacteria (2.39), fungal count (2.51), total aerobic microbe count (3.00), anerobic sporogenic bacteria (3.75), and total anaerobic microbe count (4.23). As for the average microbial count, WnC was the least (2.73 log10 CFU g−1) and LC was the highest (3.53 log10 CFU g−1) contaminated material. Regarding the variation of microbial contamination during storage, temperature was indifferent (P=0.191), while storage time (P=0.0033) and the product type were influential (P=0.000).
Authors:K. Albert, A. Koris, I. Gáspár, G. Rácz, and Gy. Vatai
Membrane emulsification (ME) is a relatively new technique for the highly controlled production of particulates, which helps to obtain a narrower distribution compared to other emulsification techniques such as homogenizers or ultrasound. Benefits of membrane emulsification for food applications include the low shear properties and the uniform size distribution. In this process, the dispersed phase (oil) is pressed through the pores of a microporous membrane directly into the continuous phase (water) flowing tangentially to the membrane surface. The purpose of the emulsification experimentations was to find and model operating conditions of the operation. In laboratory experiments from conventional, commercial grade sunflower oil (dispersed phase) and from distilled water (solid phase), emulsions were prepared. The ceramic tube membrane with nominal pore size of 1.4 μm was used in the experiments (ZrO2). In order to increase the shear-stress near the membrane wall (influence the characteristics of the flow regime of the continuous phase), a kind of self-fabricated helical-shaped-ribbon reducer was installed inside the tube membrane.
Authors:Neelam Upadhyay, Anil Kumar, Ankit Goyal, and Darshan Lal
Reversed-phase thin-layer chromatography (RP-TLC) is a sensitive, reliable, and reproducible technique, which can analyze a number of components simultaneously. This technique was exploited in the present study to identify the adulteration of vegetable oils (groundnut, soybean, and sunflower oil) in ghee, using the fact that β-sitosterol, an unsaponifiable matter, is present in vegetable oils, while absent in pure ghee. For this, RP-TLC of reference standards, unsaponifiable matter of pure ghee (cow and buffalo), pure vegetable oils, and the ghee adulterated with these vegetable oils (≥1%) was carried out on plates with different stationary phases, viz., RP-18, RP-8, and RP-2 plates using solvent system comprising of petroleum ether, acetonitrile, and methanol. The results revealed that adulteration of vegetable oils in ghee can easily be detected at a level of as low as 1 percent on RP-18 and RP-8 plates, while RP-2 plate did not offer any help in detection of adulteration. Thus, with the help of RP-TLC, a robust technique, the purity of ghee can be screened with respect to the presence of vegetable oils.
Authors:J. Tarek-Tilistyák, J. Agócs, M. Lukács, M. Dobró-Tóth, M. Juhász-Román, Z. Dinya, J. Jekő, and E. Máthé
The nutritive value, the microbiological safety of oilseed cake (OSC) obtained from naked pumpkin seed (PuC), sunflower seed (SC), yellow linseed (LC), and walnut (WnC), and their impact on wheat flour (WF) dough and bread sensory characteristics at 5% and 10% addition ratio were investigated. The OSCs had high protein (34–50%), fat (8–15%), total dietary fibre (23–36%) content and high energy value (383–444 kcal/100 g)). The OSC samples with a minimal exception fulfilled the requirements of feed legislation in force. An increased water absorption, dough development time, and reduced elasticity were observed probably due to the enhanced fiber and protein content. Dough stability increased with WnC, and decreased with PuC or SC addition. Enrichment provided the appearance of a brown bread for WnC, of a half-brown bread for LC. PuC gave an unusual look. The appearance of OSC fortified bread similar to daily bread, was an advantage resulting the 1st rank for 10% WnC bread and the 2nd one for 10% LC bread (P=0.05). The studied OSCs are suitable for food enrichment, however, in case of PuC and SC fortified flour blends, hydrocolloid application is recommended. Our data suggest that the newly developed fortified breads could be a valuable source for healthy nutrition.
Authors:A. Tomaz, M. Patanita, I. Guerreiro, L. Boteta, and J.F. Palma
In intensive irrigated farming systems, the way to improve productive efficiency depends on the proper management of resources. With the implementation of the Alqueva global irrigation system in the southern Portugal region of Alentejo, agricultural intensification is a reality that imposes to farmers the challenge of producing more and more efficiently, ensuring the farming systems sustainability. This work resulted from an on-farm demonstration project carried out in two locations in the Alqueva region. Water use and water productivity were studied during 2012/2013 and 2013/2014, in three double cropping systems: a maize monoculture (MM) and two rotations, barley + maize-barley (BM-B) and sunflower-barley + maize (S-BM). Maize yields were influenced by the length of the crop cycle. In the rotation BM-B, with a predominance of autumn-winter crops, water requirements were lower and the total volume of irrigation applied was approximately half of the monoculture (5930 m3/ha and 13,230 m3/ha, respectively). When the potential crop yield was reached, maize had the higher water productivity (the highest value achieved was of 2.7 kg/m3). Overall, as a result of the lower yields achieved, the water productivity values indicate a less balanced performance of the S-BM rotation.
Authors:Darko Kis, Tomislav Juric, Neven Voca, Vlado Guberac, and Luka Sumanovac
Krička, Tajana; Pliestić, S.; Dobričević, Nadica (1998): The Influence of Incresead Moisture on the Velocity of Drying, Dinamic Properties and Fluidization of Sunflower Seed. Agricultural Scientific Review, Faculty of Agriculture, University of Zagreb