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Showing 2 results for Single Cell Protein
Volume 4, Issue 13 (7-2007)
Abstract
Nowadays the lack of food specially protein is the most important problem. Because of the increasing of the world population the need for food is increasing day by day for this reason researches are searching for cheap resources of protein for people. Whey is by- product of cheese factory. whey provides ecological problems because of having high COD. According to these problems many researches have been done on whey and different products were achieved such as single cell protein.
In this research, the production of single cell protein from whey and trichosporon yeast are studied in external loop airlift reactor. Effective factors on gas hold up Such as air giving, ratio of down comer diameter to riser diameter and height of liquid in gas separator were studied and optimized. In this optimized situation the rate of single cell protein was achieved.
The results of experiments showed that optimimum value for air giving intensity was 2.27 cm/s , ratio of down comer diameter to riser diameter was 0/5 cm and height of liquid in gas separator was 3 cm. In this optimum condition, the amount of single cell protein was 18.9 g/l. The rate of single cell protein in stirred reactors and bubble column was 10.38 and 17.3 g/l respectively in other's researches. In comparison, external loop air lift reactor showed an increase about 8.5 percent to bubble column and 45 percent to stirred reactor in producing single cell protein. So external loop air lift seems suitable in producing single cell protein. producing single cell protein can be studied in Other air lift reactors such as internal loop airlift reactors and obtained results can be campared with the results of this research.
Abbas Zamani, Saeed Khalaji,
Volume 13, Issue 1 (1-2024)
Abstract
The aim of this study was to evaluate fish meal replacement by a bacterial single cell protein (IPL68) on growth performance, digestive enzymes activity (protease, lipase and α-amylase), gut histology and gut microbiota in rainbow trout fry (initial weight = 2.51 ± 0.55 g) for 6 weeks. Five diets were formulated with different bacterial SCP level (0:D1, 25:D2, 50: D3, 75:D4 and 100: D5 %) to replace fishmeal protein. At the end of the trial, body weight gain, specific growth rate, condition factor and hepatosomatic index showed the higher values than other diets with a significant differences (P<0.05). The food conversion ratio had the lowest and highest values in D3 and D5 diets, respectively, with a significant difference (P<0.05). The survival rate in all experimental diets was 100%. The highest activity of protease, lipase and α-amylase enzymes was observed in the intestines of fish fed with D3 diet, which showed a significant difference compared to D4 and D5 diets (P<0.05). The highest number of total bacteria and lactic acid bacteria was observed in diet D3, which was significantly different from other diets (P<0.05). The highest villus height (µm) and the ratio of villus height to crypt depth was observed in fish fed with D3 diet, which was not significantly different from D1, D2 and D4 diets, but showed a significant difference with D5 diet (P<0.05). Based on the obtained results, D3 diet can be suitable for the growth of rainbow trout fry compared to other diets.
