خيارات البحث
النتائج 1091 - 1100 من 1,443
PRODUCTION OF LOW CALORIC DEHYDRATED VEGETABLE MIXTURES
2009
S.A.S . Mehasen | M.A Ahmed | A.A . Nuaman | El-Behairy A. | Zaki Lashine | Ahmed H.
Hot flow air currents were used in sheld dryers to dehydrate some vegetables (squash, peas, green beans, potatoes, yellow carrot, tomatoes, onion, green pepper, yellow pepper, red pepper, cauliflower and eggplant) which were used to prepare 8 recipes of dehydrated vegetable mixture (vegi-mix). Sensory evaluation indicated that, 4 recipes of vegi-mix's recorded the highest scores of sensory evaluation and considered the prefer recipes and stored at ambient temperature up to 3 months during which, the physicochemical composition, the antioxidants and microbiological examination were assessed. Results revealed that the recipe composed of yellow, green and red paper, cauliflower and eggplant to prepare the vegi-mix caused to increase of total phenolic compounds, total flavonoids and total carotenoids content. The moisture contents were in the range of (8.62-9.78%); ether extract (10.23-16.76%); total carbohydrate (51.6-53.6%); crude fiber (9.62-10.61%) and total calories (340.43-375.36 kcal/100g dry weight basis respectively) for the selected 4 recipes. On the other hand, the tested vegi-mix's being also as a good source of fibers, minerals and antioxidants. Changes in moisture, crude fibers, total solids, total carbohydrate, chlorophyll a and b and total carotenoids, flavonoids and phenolic compounds as well as total bacterial counts, yeast and mould counts, sporeforming bacterial counts content were also studied during 3 months of storage at ambient temperature. A little decremental was observed in total phenolic compounds, total flavonoids content through 3 months of storage for the tested vegi-mix's. Results also showed that all tested vegi-mix's. were microbiologically safe up to 3 months of storage and maintained original sensory properties. Therfore, dehydrated vegi-mix's composed of squash, peas, green beans, potatoes, carrot, tomatoes, onion, green, red and yellow pepper, cauliflower and eggplant without herbs considered as a good source of antioxidants, minerals, high nutritional value, good palatability and healthy safe through three months of storage at ambient temperature.
اظهر المزيد [+] اقل [-]ASSESSMENT OF THE ENTOMOPATHOGENIC FUNGUS BEAUVERIA BASSIANA SAUDI ARABIAN ISOLATE (B - SA3) AGAINST THE DEVELOPMENTAL STAGES OF THE RED PALM WEEVIL, RHYNOCHOPHORUS FERRUNGINEUS (OLIV.)
2009
The efficacy of the entomopathogenic fungus Beaveria bassiana Saudi Arabian isolate (B-SA3)was evaluated against the red palm weevil, Rynochophorus ferrungineus (Oliv.).The mentioned isolate was assessed on the different developmental stages of the red palm weevil through toxicity tests, i.e. determination of lethal concentration and lethal times to kill 50% of treated insects. The results showed that 8th instar larvae were the most tolerant followed by pupa to B.bassiana as their LC50 values were 3.75x 108 and 3.78x 107 conidia/ ml, respectively. Meanwhile, 4th instar larvae were the most susceptible to infection by B.bassiana (B-SA 3), as LC50 value was 3.25x 106 conidia/ ml, which proved insignificantly different to that determined in adult weevils, i.e. 4.18x 106 conidia /ml. Furthermore, LT50 values were very similar in these latter mentioned developmental stages in any considered concentration; meanwhile, LT50 was much longer in 8th instar larvae than the other considered instar and/or developmental stages. The fungus B. bassiana was most virulent to eggs of the red palm weevil as none of the eggs hatched following their treatment with any of the considered concentrations (ranging between 5x 109 to 5x105 conidia /ml). Moreover, germination viability of harvested conidia of B.bassiana stored at -4°C was insignificantly affected up to the 10th month storage period and was well above 90%. However, germination percentage of conidia then decreased to 70.27% after 16 months of storage. Also, the virulence of the stored conidia was tested after 1, 6, 12 and 16 months on adult red palm weevils, the LC50 values were 3.75x106, 4.66x106, 4.17x107 and 3.37x108 conidia/ ml, respectively. These results show that there was a significant decrease in the virulence of the tested fungus when the duration of storage period was more than 10 months.
اظهر المزيد [+] اقل [-]INCORPORATION OF BARLEY WHOLE MEAL IN SOME DAIRY AND FOOD PRODUCTS
2009
The effect of incorporation of barley whole meal (BWM) whether in ice milk (IM) as skim milk powder (SMP) substitute, in tomato soup (ST) as modified starch substitute and in Egyptian kishk (EK) as wheat flour substitute on their properties was studied. The obtained results reveal that, the substitution with BWM was associated with increases in the fiber, β-glucan, K and Mg contents in all products studied. Whereas, the protein and ash contents increased in ST samples. The freezing point of IM mixes heightened and the specific gravity lowered by BWM addition instead of SMP. In spite of the stabilizer (CMC) level, the overrun % decreased by substitution of SMP with BWM but the melting resistance increased. Rheologically, the 50% replacement SMP with BWM achieved remarkable increase in the rheological response of IM samples especially in the presence of 0.1% CMC. At the same time, the replacing of modified starch by 200% of BWM in ST samples resulted in increasing the shear stress value and led to a mix behavior of thixotropy and rheopectic in ST samples. Although the partial or fully replacement of wheat flour with BWM led to reduction in the thixotropy area in EK samples. Organoleptically, IM and EK with 50% BWM and ST with 200% BWM substituted gained the highest sensory scores especially in the absence of CMC in IM samples.
اظهر المزيد [+] اقل [-]ISOLATION AND IDENTIFICATION OF AN ACARICIDAL GLYCOSIDE FROM Acacia saligna LEAVES
2009
A.M Moussa | A.M Emam | M.A. Mohamed | A.E Mohamed
as sources of biologically active secondary metabolites including pesticides because of their eco-friendly nature. The present study indicated that the ethylacetate extract of the Acacia saligna leaves exhibited acaricidal activity against the phytophagous twospotted spider mite ( Tetranychus Urticae Koch ). The chromatographic separation methods led to isolation of a pure compound from Acacia saligna leaf ethylacetate extract which exerted acaricidal action against the tested mite with LC50 value of 74.13 mg.l-1 after 48 h. Based on chemical (acid hydrolysis) and spectroscopic (1H, C13- NMR and MS) methods, the isolated compound was identified for the first time from plants as 2-hydroxymethyl-9-hydroxy-9-methyl-undecanyl (O-α-L-arabinopyranosyl-β-D-galactopyranoside.
اظهر المزيد [+] اقل [-]RURAL WOMEN ADOPTION OF ENVIRONMENTAL PRACTICES IN MENUFIYA GOVERNORATE
2009
Salama F.A | Farahat A. Mohamed | Eman M. Osman
This study aimed basically at identifying the level of rural women adoption of environmental practices in Menufiya Governorate. This main obective was achieved throw the followinge sub-objectives : determining the environmental knowledge level of rural women, identifying the dgree of rural women application of environmental practices, determining the factors which correlated with each of the environmental knowledge level and dgree of rural women application of environmental practiece. The study was carried out in two villeges in Menufiya Governorate, the first villege was Monshiat Bakhaty which belongs to Shebien Elkom district and the sconede villege was Sahel Elgawaber which belongs to El shohadaa district. 100 rural women were selected randomly from each village. The study findings were: the environmental knowledge level was high as 83.5% from respondents. About 47% from respondents were applying the environmental practices. There were four independent variables (social participation, culturel cosmoplitness, geographical cosmoplitness, age) explained together 16.3 % of the total variance of the environmental knowledge level. There were six independent variables (family monthly incom, environmental situation at the village, cultural cosmoplitness, family education, geographical cosmoplitness, environmental knowledge) explained together 55.5% of the total variance of the environmental application dgree.
اظهر المزيد [+] اقل [-]EVALUATION OF RED CABBAGE ANTHOCYANIN PIGMENTS AND ITS POTENTIAL USES AS ANTIOXIDANT AND NATURAL FOOD COLORANTS
2009
H M. Sror | E Rizk | A. Azouz | Lobna A.M. Hareedy
Anthocyanins derived from red cabbage were extracted, and identified by using HPLC. These pigments are used as alternative natural red colorants in some processed foods i.e.; hard candy; jelly and ice sherbets. They are also effect of using as natural antioxidant on sunflower oil. Red cabbage has 90.5 mg anthocyanin /100 gm on fresh weights. Where the major constituents were cyaniding-3-diglucoside-5-glucoside (80%) and cyanidin 3, 5 diglucoside (20%) with HPLC. The best carrier for red cabbage anthocyanin pigment was found to be dextrin followed by cellulose, soluble starch and glucose respectively. On the other hand, color and higher pigment stability of anthocyanin derived from red cabbage were in acidic condition at pH ranged between 1.0 to 4.0 and in temperatures ranged between 40 to 80ºC. Meanwhile, the degradation of anthocyanin being 10% of total pigments after 180 min at 100ºC. Antioxidant activities of red cabbage anthocyanin were assessed by determining peroxide value on sunflower oil during 7 days at 60ºC. Sunflower oil contained 200 ppm red cabbage extract showed lower peroxide value being (9.92) than using 200 ppm synthetic antioxidant (BHT) (10.12) meq/Kg. Analysis of variance for sensory evaluation of prepared hard candy, jelly and ice sherbets indicated that, hard candy, jelly contained 0.10% and ice sherbets contained 0.20% red cabbage anthocyanin pigments revealed the highest score of color, taste, odor and overall acceptability similar with synthetic color (carmine).
اظهر المزيد [+] اقل [-]EFFECT OF SOME PRESERVATION PROCESSES ON THE PHYTOCHEMICAL COMPOUNDS WITH ANTIOXIDANT ACTIVITIES OF BROCCOLI
2009
Walaa El-Shalakany | M Shatlah | M Atteia | Faten, B. EL-Kasas | Soher, S. Mostafa | G.A . Abd EL-Malak
s of broccoli using steam or immersion in hot water as traditional technology and storage conditions by either canning or freezing on the content of compounds with antioxidant properties, i.e. vitamin C, carotenoids, chlorophyll, polyphenol and flavonoid compounds parameters was investigated. Results show that the content of carotenoids was 11.41µg/g while the content of chlorophyll A and chlorophyll B was 30.66 and 9.79µg/g, respectively. The content of both carotenoids and total chlorophyll were decreased after being treated prior to different period storage for 3 and 6 month. Fresh broccoli had 40.45µg/g total chlorophyll this content decreased more significantly for the control (fresh broccoli) than for treated and different storage samples. The content of vitamin C was 124.24 mg/100g. Frozen broccoli after blanching by steam and immersion in hot water at 0 times decreased the percent of ascorbic to 83.85 and 75.89%, respectively. Jarred and canned broccoli with dill, coriander and parsley additives showed decrease in ascorbic acid to 45.98 and 40.55% meanwhile, jarred and canned broccoli without additives decreased ascorbic acid to 43.34 and 39.01%, respectively. Total polyphenols and flavonoids were 276.82 and 7.64 mg/100g on fresh weight. These contents were decreased after processing and different storage conditions. The present of antioxidant activity in fresh broccoli was 75.50%. The degradation of antioxidant activity was increased after 6 month period. The highest degradation observed with canned broccoli without additive while the lowest degradation showed with frozen broccoli blanched by steam which the percents of total antioxidant activities were14.84 and 29.65 %, respectively. The content of ferrous and zinc was 6.4 and 3.9 mg/100g on dry weight. Ferrous increased to 7.0 and 8.4 mg/100g with Jarred with dill, coriander and parsley additives and storage for 3 and 6 month broccoli and to 9.3 and 8.7 mg/100g with canned broccoli with dill, coriander and parsley additives.
اظهر المزيد [+] اقل [-]PHYSICAL, CHEMICAL AND SENSORY CHARACTERISTICS OF VEGAN CAKE
2009
Salwa, M. Abo-El-Fetoh
The objectives of this research were to investigate physical, chemical and sensory quality attributes and their relation of newly formulated vegan cake. Tiger nut milk (TNM) and alginate-lecithin gel (ALG) were used as the replacement of buffalo, s milk and whole egg at the levels of 50 and 100 %, respectively, in addition to, 50 % mixture (50 % TNM and 50 % ALG) and 100 % mixture (100 % TNM and 100 % ALG) . The results revealed that the lactose content of buffalo, s milk was 5.56%, while, TNM was free lactose. TNM is a good source of many elements as buffalo, s milk such as K, P, Ca, Na and Mg. Whole egg had significantly higher foam capacity than the alginate-lecithin gel . In contrast, alginate-lecithin gel exhibited higher foam stability than whole egg. The foam volume of alginate-lecithin gel characterized with stability during 60 min under testing as compared with whole egg that collapsed after 20 min. Concerning emulsifying activity index (EAI), both ALG and whole egg not showed significant difference (p>0.05). Emulsifying stability index (ESI) of alginate-lecithin gel was stable during 60 min under testing as compared with the whole egg that was stable till 40 min. The presence of replacement increased the batter viscosity at ambient temperature over the control value from 19.65 to 21.71-44.54 poise. Among different replacement, 100 % mixtures showed the highest batter viscosity of 44.54 p followed by 100% ALG (38.72 p), 50% ALG (34.29 p) and 50% mixtures (31.03 p). Control batter had a specific gravity of 0.892 g/cc, whereas batter replacing with 50% ALG, 100% ALG, 50% mixtures and 100 % mixtures had a batter specific gravity of 0.992, 1.009, 1.013 and 1.047 g/cc, respectively. The protein and fat contents of control samples were higher (10.42% and 26.63 %, respectively) than vegan cake samples replaced with TNM and ALG. The total carbohydrate content increased with increasing the replacement levels of TNM and ALG in vegan cake. High staling values (high freshness) of vegan cake samples reached 336.59 % and 334.08 % with vegan cake containing 100 % mixtures and 100 % ALG, respectively, in comparison to the staling of control (299.19 %) at zero time. The lower reduction in staling value was achieved in vegan cake prepared 100 % mixtures and 100 % ALG, since the staling value reduced by 10.29 % and 12.41 %, respectively, in comparison to 15.68 % for control sample after 21 days of storage at room temperature. High stability in specific volume during storage was achieved in the presence of 100 % ALG and 100 % mixture since, the specific volume was reduced by only 7.88 % and 8.83 %, respectively, in comparison to 25.99 % for control sample. The presence of ALG and mixtures decreased the hardness value from 79.46 to 36.28 and 66.11 Newton, indicating improvement in the texture of cake. Cakes containing ALG and mixtures showed lower decrement in moisture content and lower increment in hardness during storage at room temperature. Cake samples prepared with different levels of ALG and mixtures were better quality and showed significantly superior sensory properties scores than cake samples prepared with different levels of TNM which coincided with control sample at zero time. Vegan cake samples stored gave higher values and were be desirable till the end of storage period. Therefore, vegan cake could be successfully made from tiger nut milk and alginate-lecithin gel as the fully replacement of buffalos, milk and whole egg, respectively. In addition to, increase freshness, specific volume and storage at room temperature for 21 days.
اظهر المزيد [+] اقل [-]USE OF WATER HYACINTH (Eichornia crassipes) IN AMELIORATION OF A SANDY SOIL
2008
Mubarak A R | Fattoma A M Rezik | S A Afiah
Soil fertility management is a key issue for sustaining agricultural production in dry lands. Organic resources are important for nutrient avail-ability and maintenance of soil organic matter. Sustaining fertility of arid soils necessitates in-creasing inputs of organic residues. Two experi-ments with water hyacinth were carried out to monitor (in the first; field study with litter bags) decomposition and changes in N, P, K, Ca and Mg as influenced by method of application where, in the second (greenhouse study) short-term effect on some properties of a sandy soil and early estab-lishment of fodder sorghum (Sorghum bicolor). Results of the first experiment showed that resi-dues incorporated in the top 0-30cm soil depth had significantly (P≤0.01) increased loss of dry matter weight compared to surface application. Decom-position rate constants of surface and sub-surface application were 0.029% week-1 and 0.041% week-1, respectively. Potassium was the fastest nutrient released with 50% loss attained after the 2nd and 6th week from incorporation and surface application, respectively. Nitrogen, P, Ca, and Mg releases from water hyacinth incorporated in the sub-soil were significantly (P≤ range from 0.0001 to 0.008) high compared to surface application. Nutrients loss was in the order of K =Mg > P > N > Ca. However, results of the second experi-ment showed that incorporation of water hyacinth residues significantly (P ≤ 0.001) decreased pH (by about 27%) and hydraulic conductivity (by 40-46%). Also, cation exchange capacity and organic C were significantly increased by about 23 and 100%, respectively. The study concluded that ap-plication of water hyacinth could be one of the good alternatives for improving quality of arid soils.
اظهر المزيد [+] اقل [-]BIOEFFECTS OF THE ENTOMOPATHOGENIC FUNGI BEAUVERIA BASSIANA (BALS.) ON MUSHROOM FLY BRADYSIA OCELLARIS* (COMS.) (DIPTERA: SCIARIDAE)
2008
Dawalibi W A M | S M T Khoja | M M Abou- Shaar | N A Kaake
Laboratory experiments were carried out to de-termine the bioeffects of an isolate of ento-mopthogenic fungi Beauveria bassiana (Bals.) and Biofly a commercial product of B. bassiana, on the 1st instar larvae of mushroom fly, Bradysia ocellaris (coms). The bioactivity of B. bassiana was tested, using five concentrations of B. bassi-ana on some biological criteria of the mushroom fly, by calculating LC50 values after three and sev-en days of treatment. Results indicated that the mortality rates percentage increased with the in-crease of the concentrations used and the period after treatment. The highest percentage of mortali-ty occurred within the first seven days following treatment. Statistical analysis of the obtained lar-val-pupal and adults period and weight revealed significant differences between treated and non-treated insects.
اظهر المزيد [+] اقل [-]