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Register a new userStudy the effect of agar extraction pH on its yield and physical properties from the Syrian marine alga Pterocladia capillacea
دراسة تأثير درجة pH استخلاص الأغار في مردوده و خواصه الفيزيائية من الطحلب البحري السوري Pterocladia capillacea
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يهدف البحث إلى دراسة تأثير عامل pH استخلاص الأغار من الطحلب البحري Pterocladia capillacea في مردود الأغار و بعض خصائصه الفيزيائية وذلك باستخدام درجات مختلفة من pH (4- 4.5- 5- 5.5 – 6 – 6.5 – 7- 7.5 - 8). بلغ المردود الأعظمي للأغار المنتج 37.45 % عند درجة pH=5 و قوة تهلم 562g/cm2 و لزوجة 10.7cP و أدنى قيمة 15.45% عند عند درجة pH=8 مترافقة مع أعلى قوة تهلم 768 g/cm2 و لزوجة cP 156. تراوحت درجة تهلم و ذوبان الأغار بين ( 22 و 33.5 οC) ثم ( 75و 86 οC) على التوالي.
The research aims to study is to study the effect of the pH factor of Pterocladia capillacea on agar yield and some of its physical properties using different degrees of pH (4- 5.5 - 5.5 - 6.5 - 7.5 - 7.5 - 8). The maximum yield of agar was 37.45% at pH = 5 and 562g / cm2 and viscosity 10.7cP and 15.45% at pH = 8 with the highest strength of 768 g /cm2 and viscosity of cP 156. The degree of melting and melting of agar Between (22- 33.5 οC) and (75- 86 οC), respectively.
References used
ARMISEN, R. and F. GALATAS. Production and properties and uses of agar. In: (D. S. McHugh, ed.) Production and Utilization of Products from Commercial Seaweeds FAO, 1987, pp. 1-57
ARMISEN, R. and GALATAS, F. Agar. In G. O. Phillips & P. A. Williams (Eds.), Handbook of hydrocolloids, Cambridge. England. CRC Press, 2000, pp. 21–40
ARMISEN, R.; GALATAS, F.; PHILLIPS, G.; and WILLIAMS, P. Agar. In G. Phillip & P. William (Eds.), Handbook of hydrocolloids ,Cambridge: Woodhead Publishing Limited, 2009 , pp. 82-107
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The research aims to study the effect of of agar extraction
temperature (80-90- 100-110 and 120) Syrian alga Pterocladia
capillacea on its yield and and some physical properties.
The research aims to study the effect of Seasonal variations in yields and qualities
of agar seaweed Pterocladia capillacea. The results show that there is a clear impact of the
Seasonal variations in the yield, physical and chemical properties of
the extract agar.
Agar yields ranging from 10.1 to 33.8% and has been the highest in the month of June and
below 33.8% in December, 10.1% of the years 2014 to 2015. Reached the maximum value
of the strength of the gel in June, 789 g/cm2 and the minimum value of 183 g/cm2 through
December and the average rate of sulfates 3.42%. The viscosity values ranged between
35.7 and 81.4 cP, and recorded the highest value in July 81.4 cP. Melting temperature
ranged 78- 86.5 °C and Gelling temperature from 35 to 25 °C.
Seasonal changes effect on yield and quality of carrageenan from the Syrian
marine alga Hypnea musciformis were studied during 1 year. The carrageenan
yield varied from 31 to 46%. The maximum yield was recorded between April
and September, while l
ow carrageenant content was recorded in December.
The gel strength of carrageenan was maximum in September (260 g/cm²) and
minimum in March (90 g/cm²). The viscosity ranged from 22 to 44cP with a
peak recorded in September. Seasonal variations were not observed in the
gelling (42-50 C°) and melting (60-70 C°) temperatures of carrageenan. The
results indicate that Hypnea musciformis can be considered a good sources for
production of commercial carrageenan in future.
The purpose of this study is to highlight on the ability of the alga Ulva fasciata to accumulate some organic pollutants (polycyclic aromatic hydrocarbons :PAHS, polychlorinated biphenyls: PCBs). The samples were collected from three sites at the Syr
ian coast during 2011.
The result of this study revealed the ability of alga to accumulate significantly the PAHs and their concentrations ranged from 30.52 to 72.7 ng/g dw, While the PCBs concentrations were less, it ranged between 6.00 and 24.01 ng/g dw.
The highest concentration of PAHs was observed at the Dirasat site, while the highest concentration of the PCBs found at the Cornish of Jablah. The logarithm bioconcentration factors (log BCF) of the aromatic compounds with three aromatic rings were close to the logarithm octanol/water partitioning coefficients (log Kow ), unlike the compounds with higher rings, where log BCF were obviously less than corresponding log Kow.
The log BCF values of PCBs increased with increasing chlorine atoms (2 - 6 atoms) , while no increasing was observed for components that contain 7 to 8 chlorine atoms
hybrid commercial chicks (Hubbard Flex) were A total of /450/
reared from 1 to 42 days of age. Chicks were distributed into five
groups; each group contained 90 birds within three replicates. Five
diets were used; the first was the traditional die
t (control group) and
the others differed in the growth promoters added and were as
following: nutritional antibiotic (Lincomycin) for the second group,
probiotic (Bacillus subtilis) for the third group, prebiotec (manna
oligosaccharide) for the forth group and finally a mixture of organic
acids for the fifth group.
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