Showing 6 results for Barzegar
A.r. Barzegar, A. Koochekzadeh,
Volume 5, Issue 2 (summer 2001)
Abstract
The main sources of cadmium in soil-plant continuum in amounts that might present a hazard are liquid and solid wastes of sewage sludge, farm manures and fertilizers. In the southwest of Iran (Khuzestan Province) over 50,000 ha of land is under sugarcane (Saccarum officinarum) cultivation and more than 80,000 ha will be under sugarcane by the end of the year 2000. In these sugarcane fields, about 400 kg ha-1 diamonium phosphate (DAP) and 400 kg ha-1 urea are applied annually. There is no data available to show the fertilizers impact on soil, water and plant contaminations in Iran with respect to cadmium. The objective of this research was to compare the extractable cadmium of virgin soils with that of soils under sugarcane.
Four sugarcane growing stations viz. Haft-tapeh, Karoon, Shoeibieh and Ghazali with cultivation histories of 36, 20, 2 and 1 year, respectively, were selected. In each site, along a transect soil samples from 0-30 cm of both furrows and ridges of cultivated soils and of virgin soils were collected. Electrical conductivity (EC), pH, clay and organic carbon contents, CI and Cd of 101 soil samples were measured according to standard methods. Results showed that increasing either EC or CI increased Cd concentration with its maximum in virgin soils and its minimum in furrows.
Results also indicated a slight decrease in the Cd content of cultivated soils.
B. Maherani, M. Barzegar, M. A. Sahari, H. Dehghan,
Volume 8, Issue 4 (winter 2005)
Abstract
Aqueous extraction of gum from flaxseed was optimized using Response Surface Methodology (RSM). In this study the effect of temperature (45-100 °C), pH (3-7) and water/seed ratio (4-24), on the dependent variables including: yield, protein and apparent viscosity of extracted gum were investigated. The results showed that temperature and pH are two major effective factors on yield and quality of extracted gum (purity and apparent viscosity), whereas water/seed ratio had minor effects. The optimized conditions of extraction were as follows: temperature 85- 90 oC pH 6.5- 7.0 and water/seed ratio 14. Apparent viscosities of extracted gums were determined and the effect of extraction conditions on rheological properties of flaxseed gum was investigated.
M. Jamshidian, M. A. Sahari, M. Barzegar,
Volume 10, Issue 3 (fall 2006)
Abstract
For milk fat modification, after decantation of its serum, it was fractionated at three temperature rates (30-35, 17-22 and 5-10 ºC) and times (6, 13.5, and 18 hours). After each stage, the solid phase or stearine fraction was separated from liquid phase or olein fraction by centrifugation at 1600 rpm for 15 minutes. The olein fraction was then used in the second step of fractionation. This process was repeated three times until the low, medium and high melting fractions (LMF, MMF and HMF, respectively) were isolated to 27 fractions. Iodine value (by Wejs’ method) and solid fat content (SFC by NMR) of these fractions were measured and compared. The results, showed significant differences between in IV and SFC for LMF with MMF and HMF (3-6 units or 10-20% for IV and 3-14% for SFC) it was also found that LMF, MMF and HMF could be used in ice cream, Danish pastry and ice cream coating formulations, respectively.
H. Barzegar , A. Karbassi, J. Jamalian, M. Aminlari,
Volume 12, Issue 43 (spring 2008)
Abstract
Chitosan, a deacetylated derivative of chitin, is found in crustacean, arthropod, shell fish and shrimp shell as well as cell walls of some fungi . The objective of this research was to investigate the antimicrobial property of chitosan and possibility of its use as a natural preservative in mayonnaise. In this study, chitosan was produced by chemical method from shrimp shell. The antimicrobial activities of chitosan against Salmonella enteritidis and Lactobacillus plantarum were explored by calculation of the Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) in media supplemented with 0.1, 0.2 , 0.3, ..., 0.9 , 1 mg/ml chitosan adjusted to pH 5 or 6 . The MIC and MBC of chitosan differed with pH and bacterial type, ranging from 0.4 to 1 mg/ml. Antibacterial activity of chitosan was inversely affected by pH, with higher activity at lower pH value. The sauce containing 0.1, 0.2 or 0.3% chitosan was inoculated with 106 CFU/gr S. enteritidis or L. plantarum and stored at 5°C and 25°C for 8 days. The inhibitory effect of chitosan concentration was increased from 0.1 to 0.3%. This investigation demonstrated that 0.2% chitosan can be used in mayonnaise as a new preservative.
H. R. Balouchi, S. A. M. Modarres Sanavy, Y. Emam, M. Barzegar,
Volume 12, Issue 45 (fall 2008)
Abstract
Water deficit, ultraviolet radiation and CO2 concentration enhancement are three environmental stresses that affect nutrition of human in future. This research was conducted in the Research Greenhouse of Faculty of Agriculture, Tarbiat Modares University in 2006, in order to study leaf qualitative traits of durum wheat under different levels of carbon dioxide (400 and 900 ppm), ultraviolet radiation (UV A, B and C) and water deficit (up to %60 of field capacity). Ultraviolet radiation enhancement increased anthocyanin, flavenoids and carotenoids of durum wheat leaf. There was no significant interaction effect between carbon dioxide and water deficit on anthocyanin and carbohydrates. Also, the interaction effects among the three factors were not significant on anthocyanin, carotenoids, chlorophyll a and a+b. Water deficit decreased leaf proteins. Increasing intensity of ultraviolet radiation and carbon dioxide enrichment decreased soluble leaf protein in durum wheat under water deficit conditions. The results showed that three main environmental stresses which reduce leaf pigment and plant protection due to negative effects of these stresses along with soluble leaf protein reduction decrease qualitative and quantitative yield of the wheat variety.
H. Khoshghalb, K. Arzani, M. J. Malakouti, M. Barzegar,
Volume 12, Issue 45 (fall 2008)
Abstract
Changes of the main sugars and organic acids content in Asian pear (Pyrus serotina Rehd.) Cultivars ‘KS’9 and ‘KS’13 grown in Tehran were studied from fruit set to maturity. The main sugars and organic acids content in fruits were determined 1 and 2 months before harvest, at the time of harvest and 1, 2 months after harvest time using High Performance Liquid Chromatography (HPLC). Fruits were stored at 2˚C and 80-85% relative humidity (RH). There were significant differences between cultivars and time of fruit harvest in terms of sugars and organic acids content. In both studied cultivars, fructose, glucose and sorbitol increased from the first fruit sampling to one month after harvest (1 to 9% FW) and then decreased. Sucrose content decreased from 2 months before harvest to 2 months after harvest time (3 to 0.75% FW). In both studied cultivars organic acids content increased at the time of pick-up and then decreased. The highest organic acids contents in the studied cultivars were malic and ascorbic acids (345 and 41.1mg 100g-1FW in ‘KS’9 and control, respectively). The relationship between low sugar and organic acid content in fruits showed the highest correlation (0.8 to 1) in both cultivars among low flesh firmness, low total soluble solid (TSS), low dry weight and high internal browning determined in this study. Results indicated that high content of sugars and organic acids in fruit led to delayed internal browning. Asian pears with a low ascorbic acid concentration are probably more susceptible to internal browning. High correlation was observed between high sugars content and high fruit colour.
