List of Articles Chemical Quality

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  1 - Evaluation of the Chemical and Microbial Characteristics of Pasteurized Yoghurt Drink and Milk Products in Zanjan Province During the Years of 2012 to 2014
  A. Mirza Alizadeha J. Tajkey N. Satei A. A. Zamani J. Hejazi
  Introduction: Dairy products have specific roles in human nutrition due to the high biological values concerned with proteins. The aim of the present study is to evaluate the chemical and microbial characteristics of pasteurized yoghurt drink and milk products that More

  Introduction: Dairy products have specific roles in human nutrition due to the high biological values concerned with proteins. The aim of the present study is to evaluate the chemical and microbial characteristics of pasteurized yoghurt drink and milk products that were produced in Zanjan province between the years of 2012 and 2014. Materials and Methods: Totally 101 samples of pasteurized milk and 63 samples of pasteurized yoghurt drink were analysed. Sampling and chemical and microbial tests were carried out according to the Iranian National Standard. Results: According to our finding out of thetotal samples of pasteurized milk, in terms of acidity, one sample (0.99%), in terms of milks solid not fat contents, 10 samples (9.9%) and in terms of density 9 samples (8.91%) were not according to the standard. Microbial contaminations were not observed in the samples studied. The yoghurt drink samples were according to standard in terms of acidity and pH and only two samples had solid not fat contents more than the figure defined by the Iranian National Standard. The microbial examination of the yoghurt drink indicated that one sample was contaminated with coliform and five samples showed the presence of mold and yeast. Conclusion: Our findings have indicated that the microbiological loads of pasteurized yoghurt drinks and milk produced in Zanjan province are according to the values defined by Iranian National Standard, however continues supervision and controlling is required for both chemical and microbiological values of these products.   Manuscript profile
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  2 - Deterioration Indices and Histological Changes in the Nile Tilapia (Oreochromis niloticus) by Different Freezing Methods
  B. Karami Y. Moradi Sh. Safi
  10.30495/jfbt.2022.19334
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  3 - Investigating The Effects of Rainfall on Chemical Quality of Drinking Water Sources in Northern Fars Cities During 2011-2016
  Ali Shabani Mohammad Hadi Fattahi
  The purpose of this study was to investigate the effects of rainfall on the chemical quality of drinking water sources in northern Fars Province cities and on the factors EC, PH, TDS, F, NO3 in alluvial and limestone formations and in the period from 2011 to 2016 years. More

  The purpose of this study was to investigate the effects of rainfall on the chemical quality of drinking water sources in northern Fars Province cities and on the factors EC, PH, TDS, F, NO3 in alluvial and limestone formations and in the period from 2011 to 2016 years. Finding an answer to the question of whether rainfall can significantly affect the chemical quality of drinking water sources in the cities of Abadeh, Bavanat, Eqlid, Safashahr, Pasargad, Marvdasht and Zarghan and on the factors EC, PH, TDS, F, NO3 in formations And alluvial and limestone formation in the years 90 to 95? In this study, 208 wells were mentioned in cities with 96 alluvial loops and 112 wells with calcareous formations. According to Pearson correlation coefficient and p-pain results, the results showed that precipitation on changes in EC, PH, TDS NO3 is effective. In general and cumulative analysis of this factor, it has been shown that the effect of rainfall on changes in TDS, NO3 EC is significant and its relation is direct, and it is reversible on changes in pH. Also, the effect of rainfall on changes in F level is not significant, and these changes are more significant in karst and lime formations, meaning that the wells with Karst Formation with changing precipitation rates are more likely to change EC, PH, TDS NO3 Are.   Manuscript profile
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  4 - Investigating The Effects of Rainfall on Chemical Quality of Drinking Water Sources in Northern Fars Cities During 2011-2016
  Ali Shabani MohammadHadi Fattahi
  The purpose of this study was to investigate the effects of rainfall on the chemical quality of drinking water sources in northern Fars Province cities and on the factors EC, PH, TDS, F, NO3 in alluvial and limestone formations and in the period from 2011 to 2016 years. More

  The purpose of this study was to investigate the effects of rainfall on the chemical quality of drinking water sources in northern Fars Province cities and on the factors EC, PH, TDS, F, NO3 in alluvial and limestone formations and in the period from 2011 to 2016 years. Finding an answer to the question of whether rainfall can significantly affect the chemical quality of drinking water sources in the cities of Abadeh, Bavanat, Eqlid, Safashahr, Pasargad, Marvdasht and Zarghan and on the factors EC, PH, TDS, F, NO3 in formations And alluvial and limestone formation in the years 90 to 95? In this study, 208 wells were mentioned in cities with 96 alluvial loops and 112 wells with calcareous formations. According to Pearson correlation coefficient and p-pain results, the results showed that precipitation on changes in EC, PH, TDS NO3 is effective. In general and cumulative analysis of this factor, it has been shown that the effect of rainfall on changes in TDS, NO3 EC is significant and its relation is direct, and it is reversible on changes in pH. Also, the effect of rainfall on changes in F level is not significant, and these changes are more significant in karst and lime formations, meaning that the wells with Karst Formation with changing precipitation rates are more likely to change EC, PH, TDS NO3 Are. Manuscript profile
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  5 - Possible Use of the Chlorophyll Meter for Diagnosing Nitrogen Deficiency in Early Growth Stage of Tobacco under Field Condition
  Mohammadtaghi shamelrostami Abbas Biabani Abdollatif Gholizadeh Hosein Sabouri Ebrahim Golamalipour Alamdari
  Nitrogen is one of the most essential nutritional element in growth and a determining factor in tobacco yield. Therefor, rate and timing of nitrogen application is very important for growth of this plant. The purpose of this study is to use SPAD values to estimate nitro More

  Nitrogen is one of the most essential nutritional element in growth and a determining factor in tobacco yield. Therefor, rate and timing of nitrogen application is very important for growth of this plant. The purpose of this study is to use SPAD values to estimate nitrogen usage through correlation of SPAD value with yield and quality traits at different growth stages of tobacco. This study was conducted in a randomized complete block design on flue cured tobacco (K-326 cultivar) in Tirtash Tobacco Research and Education Center for two years (2015 and 2016). Treatments consisted of three nitrogen level (20, 40 and 60 kg.ha-1) and three application methods of nitrogen (1- two parts of nitrogen broadcasted before planting + one part of nitrogen as side dressing, 2- one part of nitrogen before planting + one part as first side dressing + one part as second side dressing, 3- two parts of nitrogen fertilizer as strip application + one part as side dressing) and a control (without fertilizer treatment). Chlorophyll meter (SPAD-502) was used in 40, 50 and 60 days after planting for greenness of lower, middle and upper leaves and various parts of the leaves (top, middle and bottom). During the growing season, length and width of upper, middle and lower leaves, green and dry leaf weights, average price and gross income were determined. The results showed that green and dry leaf weights were increased by increasing nitrogen application and this was significant at %1 probability level. The highest correlation between SPAD value and upper leaves yields of 40 days transplanting was R2=0.86 and middle leaves yield after 50 days of transplanting was R2=0.89 which were the best leaves for estimating tobacco nitrogen usage. Average price of tobacco was decreased as nitrogen use increased and highest gross income was obtained by using 20 kg nitrogen with 3 split applications. Manuscript profile
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  6 - Chemical and Microbial Quality of Pasteurized Yoghurt in the Zanjan Province in 2012 to 2014
  Adel Mirza Alizadeh Mehran Mohseni Abbas Ali Zamani Hamid Barani Bonab
  Abstract Generally, yogurt has the highest consumption among all fermented milk products in the world and has significant nutritional value, particularly protein and calcium. Yogurt due to having higher acid, often suffer micro-organism infections resistant to acid such More

  Abstract Generally, yogurt has the highest consumption among all fermented milk products in the world and has significant nutritional value, particularly protein and calcium. Yogurt due to having higher acid, often suffer micro-organism infections resistant to acid such as molds and yeasts. But main surface spoilage in yogurt occurs by mold. The present study was done between the years 2012 to 2014 on pasteurized yogurt samples collected from 9 dairy products industry of Zanjan Province for the purpose of monitoring the quality of products. The results showed that from among 50 samples of pasteurized yogurt, all of them in terms of acidity, pH and solids-not-fat (SNF) properties were consistent with national standards. Also in investigating the total bacteria count, no infection was observed with pathogenic micro-organisms. Findings from the study showed that most of the pasteurized yogurt produced in the Province of Zanjan in terms of the quality and biological characteristics is suitable and compliant with standards. Manuscript profile