Do you want to publish a course? Click here

The Effect of Storage Conditions (Temperature Degree and Storage Time) on the Most Important Properties of Locally Marketed Pastrami

دراسة تأثير ظروف التخزين (درجة الحرارة, مدة التخزين) على أهم خصائص البسطرمة المسوقة محلياً

2355   0   52   0 ( 0 )
 Publication date 2014
and research's language is العربية
 Created by Shamra Editor




Ask ChatGPT about the research

Pastrami, manufactured from beef and abdominal fat and of a ratio of 3 meat to 1 fat, was stored under refrigeration at (4±2 °C) and storage times (0, 15, 30, 60, 120, and 180 days). The effects of storage times on the most important chemical, microbiological and sensory properties of pastrami were investigated. The results of chemical analyzes showed that the studied pastrami conformed to the Syrian Standards in terms of the proportion of salt and fat content, and it nearly conformed to the standards in terms of humidity. The results also showed a slight decrease in the percentage of moisture, fat and protein, and an increase in each of the acidity, proportion of total volatile nitrogen, soluble nitrogen and peroxide value in pastrami with the progress of the storage period at the temperature degree (4±2 °C). The microbial tests showed that pastrami is free from some sickening organisms especially salmonella and E. coli. It also showed that the census of the aerobic bacteria, yeasts and fungi was within the limits of the Syrian standards. The results showed deterioration in the microbial properties of stored pastrami with the progress of time; pastrami became invalid from a microbial point of consumption after two months of storage as a result of the big number of aerobic bacteria, yeasts and fungi. The sensory tests showed deterioration in the organoleptic characteristics of storage with the progress of time, the deterioration was clear after two months of storage; pastrami became unacceptable in terms of taste, color, smell and texture.

References used
Aksu, M. I., Kaya, M., & Ockerman, H. W. (2005). Effect of modified atmosphere packaging and temperature on the shelf life of sliced pastirma produced from frozen/thawed meat. Journal of Muscle Foods, 16, 192–206
Aksu, M. I., & Kaya, M. (2002). Effect of commercial starter cultures on the fatty acid composition of pastirma (Turkish dry meat product). Journal of Food Science, 67(6), 2342–2345
AOAC. Association of Official Analytical Chemistsy. Official methods of Analysis, 15th edition, Arlington, 1990,USA
rate research

Read More

The aim of this research is to study the most important physical, chemical and microbial changes in several kinds of infant milk available in local markets. The milk samples were studied in conditions similar to those used by mothers when they prep are infant milk bottles at their houses. The results showed that moisture content increased in all samples from approximately 1% to 3.2-4.4% after storage for 9 days. Acidity increased considerably from 0.14% to 0.2%. The results showed that peroxide value passed the allowable limits (0.25) and reached about (0.47) in samples stored for 9 days at room temperature. However, the value for samples stored in the refrigerator ranged between (0.25-0.29). The free acidity number of fat for all samples specially the refrigerated ones was within the natural limits (<0.5). Chromatographic analyses showed apparent differences in fatty acid percentages between the kinds of milk. The rate of lenoleic acid (C 18-2 ) decreased during storage in all samples and in all conditions. Soluble nitrogen increased in all samples at the end of storage and the highest value was 0.49% in Nido milk samples. The solubility of milk samples was checked during storage and was found to decrease very little ( 1%). The total count of aerobic bacteria showed that all samples conform to the Syrian standards (No. 197, 1996) during the first six days of storage, but they passed the upper limits at the end of storage. However, all samples were free of pathogenic microbes .
Green tomato fruits of different studied hybrids such as, Amal, Steel, Tartila, and 2-75/96, which had been grown in a greenhouse at Abi- Jarash Farm were picked up and stored at temperatures of 12 c and 20 c for 29 days. The fruits, which were st ored at 12 c had been transferred to 9 cْ, and then stored for an additional period of two weeks. The chemical composition of the stored fruits was evaluated, which included: acidity percentage, total soluble solids, and the quantity of vitamine C. The ratio of fruit weight loss during storage was studied as well.
The objective of this research was to study the refrigerated condition (temperature +-1°C, and relative humidity of 75-85%) and non-refrigerated methods of packaging and treatment with MCP-1 on the storage capacity of two onion cultivars (round and elongated). The experiment was carried out in the College of Agriculture - University of Damascus .
Background & Objective: Spray drying techniques are used to produce inhaled powders of enzymes and proteins without denaturation. The surface free energy data of these powders is used to reduce the time of formulation development. During storage, the surface free energy of the inhaled protein powders could change and so their performance will be affected. Many factors affect the limit of this change. Storage temperature is the critical factor. Material& methods: A spray drying method was optimized to prepare inhaled spray dried lysozyme powders. Inverse gas chromatography was utilized to measure the surface free energy of the prepared powders pre and post-storage to detect the effect of storage temperature on the surface free energy. Differential Scanning Calorimetry and biological activity tests were used to evaluate the integrity of lysozyme conformation after storage at different storage temperature. Results: Increasing the storage temperature decreased both dispersive and specific surface components of the spray-dried lysozyme powders significantly (ANOVA: P < 0.001) up to 12% and up to 31 % after storage for one year at 40 °C, respectively. The overall decrease in the polar components resulted in a reduction of the surface basicity. These decreases in the surface energetics would be due to the aggregation of denatured lysozyme molecules at the powder surface via hydrophobic regions rich with electrons. The same results were found after storage for one year at room temperature, but the extents of changes were smaller. Conclusion: It is advisable to store protein powders at 5°C to inhibit the changes in their surface free energy which is the crucial factor affecting their performance.
Vitamin C concentration was studied in samples of infant formula from 5 companies (referenced A-E) using the 2,6-Dichlorophenolindophenol titration (AOAC, 2006) method. Results revealed that ascorbic acid content in formulas D and C was the closest to its recommended daily intake (RDI) and to the concentrations which are mentioned on the label of the samples. Storage conditions at room temperature or in the refrigerator did not affect ascorbic acid levels. In comparison to vitamin C concentrations in milk dissolved in tap water, its levels decreased when water was warm (40°C) or hot (100°C), and its concentrations further declined in dissolved form kept for two hours after preparation.
comments
Fetching comments Fetching comments
mircosoft-partner

هل ترغب بارسال اشعارات عن اخر التحديثات في شمرا-اكاديميا