Showing 7 results for Rice
Sm Mehdinia, F Abdul Latif , H Taghipour,
Volume 10, Issue 3 (3-2012)
Abstract
Abstract
Background: In recent years researchers have shown that increasing in pressure drop and low amount of elimination capacity are two main limitations of biofiltration systems in pollutants treatment. Therefore, the main goal of this study was to investigate the relationship between pressure drop and hydrogen sulfide (H2S) elimination capacity with different mass loading rates in biofiltration system using activated sludge and mixed activated sludge and rice husk silica as packing materials.
Methods: Two poly vinyl chloride (PVC) filters with one liter of prepared bed were tested for each filter. Dried activated sludge was collected from Putrajaya sewage treatment plant in Malaysia. The system was tested from different empty bed residence time (EBRT) from 30 to 90 sec and different H2S mass loading rate from 18.36 to 54 gm-3h-1.
Results: Based on the statistical analysis of Pearson correlation, there was a direct and very high relationship between the increasing hydrogen sulfide mass loading rate and the amount of pressure drop in the both packed filters (p<0.01). Also, with the H2S mass loading rate of 54 gm-3h-1 and EBRT of 30 s, the maximum elimination capacity was obtained in the activated sludge and mixed rice husk silica with dried activated sludge packed filters up to 52.32 and 44.33, respectively. Moreover, based on the statistical analysis of the Pearson correlation, there was a direct and very high corelatior between the increasing H2S mass loading rate and the amount of pressure drop in the both filters (p<0.01). After 53 days of operating time and 54 gm-3h-1 of mass loading rates, the maximum pressure drop reached to 3.0 and 8.0 (mm H2O) for the mixed rice husk silica with dried activated sludge packed and dried activated sludge packed filters, respectively.
Conclusion: Based on the results of the study, there is a direct and positive relationship between the increasing H2S mass loading rate and the amount of pressure drop and elimination capacity in both filters, but mixed rice husk silica with dried activated sludge showed higher elimination capacity and lower pressure drop.
Am Gholizadeh, M Kermani, M Gholami, M Farzadkiam,
Volume 11, Issue 3 (2-2013)
Abstract
Background : Industrial wastewaters contain organic pollutant such as dyes, halogenated hydrocarbon, phenolic compounds and so on Rice husk is a cheap material which is new available in our country. The aim of this study is removal efficiency comparing rice husk ash performance with commercial granulated activated carbon in removal of 2-CP and 4-CP from aqueous solutions.
Methods : Experiments were carried out in dual laboratory-bench scale to evaluate the effect of f actors including adsorbent dosage, pH, equilibration time and phenolic compound concentration regarding the effect of selected pollutant adsorption for removing this phenolic compound and comparing these methods. Spectrophotometeric measurements were carried on in wave lengths of 274 and 280 nm for 2-chlorophenol and 4-chlorophenol respectively. The adsorption parameters were determined using both of isotherm and kinetic models.
Results: The Results showed that the activated carbon efficiency for selected compounds was rather more than rice husk ash. However rice huck ash (RHA) efficiency for these compounds was comparable with activated carbon. It was shown that a rapid equilibration could be achieved at pHs as low as 5 and 7 for RHA and GAC, respectively. The adsorption efficiency decreased with increasing the initial phenolic concentration and decreased with decreasing the adsorbent dosage. The adsorption isotherm studies clearly indicated that the adsorption process is on surface of RHA and fits into the Freundlich model. Also GAC adsorption isotherm for 2-Chorophenol fit into the Langmuir isotherm and for 4-chlorophenol fit into Freundlich model. The applicability of Ritchie, pseudo first order and pseudo secound order kinetic model was also been investigated. It was indicated that both methods were correlated with pesoudo secound order kinethic model.
Conclusion : Activated carbon and RHA exhibit reasonable adsorption capacity for the phenolic compounds and as to the results, RHA was found to be a useful agricultural waste product for the removal of some phenolic compounds.
A Rahbar, M Barouni , Ma Bahrami, A Saber Mahani ,
Volume 12, Issue 3 (12-2013)
Abstract
Background: The rising expenditure of drugs is a worldwide policy concern. This research aimed to estimate drug demand function in Iranian urban population in order to help effective policy making for drug consumption rationalization.
Methods: This is a descriptive–analytical research. The required data were gathered from the published statistics of Iran Statistics Center, Iran Central Bank and Food and Medication deputy of Iran health and Medical Education Ministry at a time series of 20 years. Data analysis was carried out using E-Views software and regression analysis.
Results: The findings of research indicated that drug demand in Iranian urban populations’ drug demand function is an intrinsic variable that is influenced by households’ income, price index of drugs and the cost of physician visit. Price-elasticity, income-elasticity and cross-elasticity in relation with physician visit cost for drug demand were calculated as 0.56, 0.42 and 0.18, respectively.
Conclusion: The low estimated price- and income-elasticity of drug describes that drugs have the role of essential goods in Iranian urban population. Based on this finding, it is concluded that drug consumption rationalization and controlling policies should consider other-than-price strategies in theIranian society.
B Hajimohammadi , Mh Ehrampoush , M Soltani , H Mozaffari Khosravi, F Zare , Hr Jamshidi , Hr Dehghan , A Dalvand ,
Volume 14, Issue 6 (3-2016)
Abstract
Introduction: Aflatoxins are usually produced from Aspergillus Flavus and Aspergillus Parasiticus. This toxin is found in the most of foods, such as rice. The aim of this study was to survey the relation between rice consumption with Aflatoxin M1 excretion rate in women of Yazd using biomarkers.
Methods: This was a cross sectional-descriptive study that was done in 2014. Eighty five women were selected among women who referred to health centers of Yazd. ELISA method was used to measure Aflatoxin M1 in urine samples.
Results: The results show that from total number of 85 women, 94% were excreted Aflatoxin M1. There was a significant difference between rice consumption (p=0.015) and type of consumed rice (p= 0.023) with excretion of Aflatoxin M1.
Conclusion: According to the results it can be concluded that with increasing rice consumption, daily intake of Aflatoxin increases. Therefore the amount of Aflatoxin in rice consumption by women of Yazd is high and a lot of people are exposed to high concentration of Aflatoxin and health hazards related to it.
B Hajimohammadi, M Kiani, Mh Mosadegh, J Biabani, H Fallahzadeh, Ms Tabatabayi ,
Volume 15, Issue 3 (9-2016)
Abstract
Introduction: Mycotoxin contamination of crops for human and animal health has been facing a serious concern. Aflatoxin B1 is the most toxic types of aflatoxins in foodssuch as rice. The aim of this study was to investigate the Effect of heating processes and home cooking methods of rice on concentration of aflatoxin B1.
methods: The heating processes of 20 and 120 minutes and rinse in three types of roasted rice, boiled and water cooked was studied in naturally contaminated with aflatoxin B1 and the amount by high performance liquid chromatography (HPLC) measured.
Results: In the cases of 20 minutes and 120 minutes, the mean concentration of aflatoxin B1 heats rice decreased as much as 16.6% and 81.7%. Although this reduction was not statistically significant heating at 20 minutes but at 120 minutes with heating was significant(P<0/05). The decrease in the average concentration of aflatoxin B1in boiled, water cooked and roasted rice to order 60.2%, 85.5% and 87.6% indicated that this reduction was not statistically significant in the boiled cooking, but the cooking utensils and this reduction was not statistically with fried rice (P<0/05) was significant.
Conclusion: The results show that the processes of heat and cook the rice variety could reduce the risks of aflatoxin B1 in rice consumed by man.
Bahador Hajimohammadi, Gilda Eslami, Mahsa Aalaei, Mohammad Hasan Ehrampoush, Mohammad Ebrahim Rezvani, Hossein Fallahzadeh, Mehrnoosh Shirdeli,
Volume 18, Issue 1 (5-2019)
Abstract
Introduction: Genetically modified plants species of plants are produced by the genetic engineering of agricultural science and the addition of specific genes in their genetic sequences with the aim of optimizing the product and creating desirable traits. This study examined the remains of Cry1A(b) and P35 genes in blood of rats fed with genetically modified rice.
Methods: This study was experimental and interventional and the study population included male and female rats Sprague Dawley (SD), which were divided into two treatment and control groups according to the type of food received. The first group consisted of 50% of the genetically modified rice and second group consisted of 50% of non- genetically modified rice. sampling and DNA extraction from the blood was done after 90 days of feeding the rats with the nutritional pattern using a kit. Quantitative and qualitative study of extracted DNA was performed using agarose gel electrophoresis and spectrophotometry, respectively.
Results: Amplification product with targets P35, Cry1A(b) and T35 was studied using agarose gel electrophoresis 1.5%, which showed that blood samples were negative for the presence of transgenic genes.
Conclusion: The results showed no significant difference in the presence of transgenic genes of p35 and Cry1A(b) in the blood tissue of the treatment and control groups of rats. Therefore, the results of this study reject the possibility of gene transfer to the existing organs of the consumers. Results of this study showed that there is no difference between safety of genetically and non-genetically modified rice from viewpoint of gen transferring.
Miss Ameneh Shiri, Dr Mohammad Hassan Ehrampoush, Dr Seyed Ali Yasini Ardakani, Dr Neda Mollakhalili-Meybodi,
Volume 22, Issue 1 (4-2023)
Abstract
Introduction: Bread is one of the most important components of the diet all over the world. Failure to obtain the unique properties of gluten protein has made it difficult to obtain the desired properties of gluten-free bakery products. Inulin is one of the soluble nutritional fibers widely used in the food industry.
Methods: Textural, physicochemical, sensory and shelf life characteristics of inulin in gluten-free bread samples based on rice-acorn flour (70:30) enriched with 10% w/w-1 prebiotic inulin with different degrees of polymerization (less than 10, more from 23 and 60-2) and the conditions of mixed fermentation based on sourdough [MF-SD] were investigated.
Results: Results indicated that MF-SD and using long-chain inulin was able to form a structure able to hold the gases produced during the fermentation and expanded through cooking process and improve the textural characteristics, which seems to be due to its potential ability to form a gel. Additionally, highest inulin stability is also observed at this sample. So that the optimized technological characteristics and lowest inulin loss ration (31% w/w-1) is found at gluten-free bread samples containing 30% w/w-1 of acorn flour and long-chain inulin fermented by MF-SD (A30R70SL).
Conclusion: The use of long-chain inulin is recommended to achieve desirable technological characteristics and high nutritional value in the formulation of gluten-free bread.
