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Articles by N. Sadeghi
Total Records ( 6 ) for N. Sadeghi
  B. Jannat , M. R. Oveisi , N. Sadeghi and M. Hajimahmoodi
  In recent years, hormones and hormone-like compounds have been frequently used in vegetable and livestock production to obtain a high yield performance in a shorter period of time, but depending on the use of anabolics in animal feed, anabolic residues that may occur in meat and meat products would present the risks to the human health. The present study was undertaken to detect and quantify the levels of trenbolone residues (a potent synthetic analog of testosterone) in the market meat in Iran. Cattle meat samples were collected from the markets in Tehran. A total of 120 samples of cattle meat were analyzed for level of trenbolone by Enzyme-Linked Immunosorbant Assay method. The average experimental values of trenbolone in cattle meat were 3.76±5.26ng/kg. This value gave no evidence for the illegal use of hormones in Tehran, but these results do not exclude the possibility of misuse of these potentially harmful chemicals in future. There is, therefore, need to routinely monitor these chemicals as a food quality and health control measure.
  M. Hajimahmoodi , M. Hanifeh , M. R . Oveisi , N. Sadeghi and B. Jannat
  Green tea is one of the important sources of bioactive compounds which have been used in folk medicine for many centuries. This study aimed to compare in vitro antioxidant power of different types of green tea (Camellia sinensis). Antioxidant activity of methanolic (50%) extracts of five green tea samples was investigated according to Ferric reducing ability power method. Total phenolic contents were analyzed using a spectrophotometric technique, based on the Folin-ciocalteau reagent, and calculated as gallic acid equivalents per gram dry weight. Total flavonoid and antocyanidin were also investigated according to aluminum chloride and vanillin colorimetric assay respectively. Total antioxidant activity varied from 0.554±0.042 in Avicen green tea sample to 3.082±0.150 mmoL FeII/g in Chinas green tea and total phenolic content ranged from the 0.030±0.001 in Avicen green tea sample to 0.196±0.012 g gallic acid per gram dry weight in Ahmad green tea. A linear positive relationship existed between the antioxidant activity, total phenolic, flavonoid and antocyanidin content of the tested green tea samples. Green tea samples possess relatively high antioxidant activity due to contribution of phenolic compounds. The present study showed that green tea samples which are more frequently consumed in Iran are strong radical scavengers and can be considered as good sources of natural antioxidants for medicinal and commercial uses.
  B. Jannat , M. R. Oveisi , N. Sadeghi , M. Hajimahmoodi , M. Behzad , E. Choopankari and A. A. Behfar
  Sesame seed ( Sesamum indicum L.) is one of the world's most important and oldest oilseed crops with a high level content of antioxidant known to human health. The antioxidant factors responsible for the stability of roasted sesame seeds is highly affected by the conditions of the roasting process. Survey of the roasting temperature and time effects on antioxidants and total phenolic content in Iranian sesame seeds was the aim of this investigation. Spectrophotometer methods based on folin-ciocalteau reagent for determination of total phenolic content (TPC) and Ferric Reducing Antioxidant Power assay (FRAP) technique for total antioxidant activity were used before and after different roasting processes. Some of 8 Iranian sesame seeds cultivares were studied (n = 160), including Branching Naz, Non Branching Naz, Dezful, Darab, Karaj, Moghan, Varamin and Black sesame. The range of FRAP values was between 0.301±0.029μM and 1.746±0.083μM in Moghan and Branching Naz seasem seed cultivares, respectively. The FRAP value increased from 0.974±0.095 μ M in unroasted Branching Naz as a control to 1.746±0.083 μ M after roasting in 200ºC for 20min. Also TPCs increased significantly as the roasting temperature. The amount of TPC varied in different sesame cultivars from 20.109±3.967 μ M to 129.300±3.493 μ M in Varamin and Branching Naz sesame seed cultivares, respectively; also TPC increased from 70.953±5.863 μ M in unroasted Branching Naz sesame seed as a control to 129.300±3.493 μ M after roasting in 200ºC for 20 min .Branching Naz seasem seed cultivare was at the highest level in total antioxidants and total phenolic contents in comparison to other samples; however Moghan and Varamin cultivares were at the lowest level in total antioxidants and total phenolic contents, respectively. The present study showed that Iranian sesame seed can be considered as a good source of natural antioxidant specially after roasting. The optimum temperature and time roasting to obtain the most antioxidants and total phenolic content was 200º C for 20 min.
  M. Hajimahmoodi , N. Sadeghi , B. Jannat , M.R. Oveisi , S. Madani , M. Kiayi , M.R. Akrami and A.M. Ranjbar
  Antioxidant activity of methanolic (50%) extracts of olive pulp (Olea europaea L.) was investigated. Total antioxidant activity, phenolic contents and reducing power in six Iranian olive cultivars were determined. The highest antioxidant activity (28.699 mmol FeII/100 g dry plant), total phenolic contents (2997 mg gallic acid/100 g dry plant) and reducing power (8.331 g Vitamin E/100 g dry plant) were detected in Mishen and the lowest in Conservalina. A linear positive relationship existed between the antioxidant activity, total phenolic compounds (r2 = 0.976) and reducing power of the tested olive pulp (r2 = 0.848). Iranian olives possess relatively high antioxidant activity due to contribution of phenolic compounds. The present study shows that Iranian olive cultivars are strong radical scavengers and can be considered as good sources of natural antioxidants for medicinal and commercial uses.
  M. Hajimahmoodi , M.R. Oveisi , N. Sadeghi , B. Jannat , M. Hadjibabaie , E. Farahani , M.R. Akrami and R. Namdar
  This study compares the antioxidant activity of ten different pomegranate cultivars grown in Iran using the ferric reducing power assay (FRAP assay), which is based on the reduction of a ferric-tripyridyl triazine complex to its ferrous, colored form in the presence of antioxidants. Aqueous solutions of known Fe+2 concentration, in the range of 100-1000 ╬╝mol L-1 were used for calibration. The results showed that among pulp and peel fractions the sour alac and sweet white peel cultivars had more FRAP value respectively. The pomegranate peel extract had markedly higher antioxidant capacity than the pulp extract. The peel extract of sweet white peel cultivar appeared to have more potential as a health supplement rich in natural antioxidants compared to the pulp and peel extracts of other pomegranate cultivars.
  M. Khanavi , G. Moghaddam , M.R. Oveisi , N. Sadeghi , B. Jannat , M. Rostami , M.A. Saadat and M. Hajimahmoodi
  Pomegranate (Punica granatum L.) is native to the Mediterranean region and has been used extensively as a medicine in many counties. Hyperoside is known as an important flavonoid with antioxidant activity and anti hypertension effect. Anthocyanins are the active component in several herbal medicines, thus accurate measurement of hyperoside and anthocyanins, along with their degradation indices, is very useful to food technologists and horticulturists. The aim of the current study was to determine the antioxidant capacity as hyperoside and anthocyanin content of ten different Iranian pomegranate cultivars. Spectroscopic analyses of the pomegranate showed Black peel cultivar had the highest hyperoside content (25.93±2.87, 620.41±30.32 mg/100 g) in its pulp and peel, respectively. Based on this study, the amounts of anthocyanin in pulp ranged between 1.56±0.05 and 3.89±0.07 mg g-1 which related to Sweet white peel and Sweet alac cultivars, respectively. More over the highest and also the lowest peel anthocyanin contents related to these cultivars. The results revealed that the hyperoside and also anthocyanin peel content of each variety is higher than its pulp content. In addition the potency of black peel (Medicinal pomegranate) and Sweet alac cultivars for prevention of coronary heart disease and hypertension were presented.
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