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Characterization of fish gelatin-gum arabic complex coacervates as influenced by phase separation temperature. - International journal of biological macromolecules
The rheological and structural characteristics of fish gelatin (FG)-gum arabic (GA) complex coacervate phase, separated from an aqueous mixture of 1% FG and 1% GA at pH 3.5, were investigated as influenced by phase separation temperature. Decreasing the phase separation temperature from 40 to 10 Â°C lead to: (1) the formation of a coacervate phase with a larger volume fraction and higher biopolymer concentrations, which is more viscous, more structural resistant at low shear rates, more shear-thinning at high shear rates, and more condensed in microstructure, (2) a solid-like elastic behavior of the phase separated at 10 Â°C at a high oscillatory frequency, (3) the increase in gelling and melting temperatures of the coacervate phase (3.7-3.9 Â°C and 6.2-6.9 Â°C, respectively), (4) the formation of a more rigid and thermo-stable coacervate gel. The coacervate phase is regarded as a homogeneously networked biopolymer matrix dispersed with water vacuoles and its gel as a weak physical gel reinforced by FG-GA attractive electrostatic interactions.Copyright Â© 2015 Elsevier B.V. All rights reserved.
Effect of nisin as a biopreservative agent on quality and shelf life of vacuum packaged rainbow trout (Oncorhynchus mykiss) stored at 4Â Â°C. - Journal of food science and technology
Effect of nisin on biochemical and microbial quality and shelf life of vacuum packaged rainbow trout (Oncorhynchus mykiss) during 16Â days storage at 4Â Â°C was investigated. According to the obtained results, nisin treated fish showed lower (pâ€‰<â€‰0.05) and acceptable biochemical (Peroxide value, thiobarbituric acid-index, pH, and total volatile base nitrogen) and bacteriological (total viable counts, psychrotrophic viable counts, and lactic acid bacteria) attributes up to 16Â days storage at 4Â Â°C compared with those treated without nisin. Furthermore, FAs composition analysis indicated that presence of the nisin preserved nutritional quality of fish lipid, so that nisin treated samples contained higher percentage (pâ€‰>â€‰0.05) of essential FAs such as eicosapentaenoic acid and docosahexaenoic acid. This study concluded that treatment of the vacuum packaged rainbow trout with nisin resulted in improvement of quality and extension of shelf life of the fish from 12 to 16Â days at 4Â Â°C.
Characterisation of interactions between fish gelatin and gum arabic in aqueous solutions. - Food chemistry
The interactions between fish gelatin (FG) and gum arabic (GA) in aqueous solutions were investigated by turbidimetry, methylene blue spectrophotometry, zeta potentiometry, dynamic light scattering, protein assay, and state diagram at 40 Â°C and a total biopolymer concentration (C(T)) of 0.05%. FG underwent complex coacervation with GA, possibly via its conformational change, depending on pH and FG to GA ratio (FG:GA). The formation of FG-GA complexes was the most intense when pH 3.55 and FG:GA=50:50 (6.6:1 M ratio), however, the coacervate phase was found to be composed of a much higher FG fraction. The pH range of complex formation shifted to a higher pH region with increasing FG:GA. Soluble and insoluble FG-GA complexes were formed even in a pH region where both biopolymers were net-negatively charged. Varying C(T) significantly influenced not only the formation of FG-GA complexes but also the development and composition of coacervate phase.Copyright Â© 2012 Elsevier Ltd. All rights reserved.
Family function and social support in Iranian self-immolated women. - Burns : journal of the International Society for Burn Injuries
The significance of family function and social support in Iranian self-immolated women was investigated in this study.In a prospective design, we selected 53 cases (31 self-immolated women and 22 women with unintentional burn) from Tehran and Shiraz burn centre (Motahari and Ghotbeddin Shirazi, respectively). The average age of the experimental group was 26.19 (S=7.11) with a burn percentage of 46.11 (S=25.52), and the average age of the control group was 29.15 (S=5.12) and their burn percentage was 43 (S=25.98). Along with Demographic Information Questionnaire, participants were administered Family Assessment Device (FAD) and Social Support Scale (SSS). To analyse data, we used chi-square test (Ï‡(2)), t-test, multivariate analysis of variance (MANOVA) and also logistic regression analysis.Data showed that the difference of Family Function sub-scales between the experimental and control groups was not significant (Wilk's lambda=0.75, F=1.67, df=(8, 51), P<0.05). On the other hand, two independent sample t-tests showed a significant difference of Social Support between the two groups (t=-3.31, df=51, P<0.002).Consistent with previous studies, this research showed that the less Social Support one perceives the more one at risk for self-immolation. Although the mean scores of FAD sub-scales in control group were more than experimental group, there was no significant difference between the two groups.Copyright Â© 2011 Elsevier Ltd and ISBI. All rights reserved.
Gradual and complete delivery of a hydatid cyst of the brain through a single burr hole, a wrong happening! - Child's nervous system : ChNS : official journal of the International Society for Pediatric Neurosurgery
Cerebral hydatidosis is a rare larval infection of the central nervous system affecting mostly the children and young adults.The authors report a case of a 5-year-old girl harboring a large right frontoparietal hydatid cyst. The imaging studies were not diagnostic for 'cerebral hydatidosis' and were interpreted as 'brain abscess'.Attempting for simple cannulation of the lesion through a burr hole drained a clear fluid. The cannula was removed promptly but the cyst wall came out little by little through the hole in a single piece which turned out to be the entire wall of a hydatid cyst. She was treated by antihelmintic medications for 6 months and there has been no sign of recurrence after a year. Odd paraclinical imaging characteristics and unique accidental surgical event makes this case the first reported pediatric brain hydatidosis with spontaneous complete delivery of the cyst through a single burr hole which can certainly be considered a wrong attempt if undertaken intentionally.
Effect of cooling-heating rate on sol-gel transformation of fish gelatin-gum arabic complex coacervate phase. - International journal of biological macromolecules
The objective of this study was to characterize influence of different cooling and heating rates on gelation of fish gelatin (FG)-gum arabic (GA) complex coacervate phase using rheological measurements. For the coacervate phase prepared at 10Â°C, the gelling temperature, melting temperature, gel strength, and stress relaxation decreased with increasing cooling or heating rate, however, no gelation was observed at the highest cooling rate of 0.05Â°C/min. Similar trends were obtained for the coacervates phase prepared at 30Â°C, but the gelation did not occur at a cooling rate of 0.033 or 0.05Â°C/min. The results indicated that rheological properties of FG-GA coacervate gels were highly dependent to the cooling process, where more thermos-stable and stronger gels formed at slower cooling. This was probably because of higher degree of molecular rearrangements, more hydrogen bindings, and formation of greater junction zones into the gel network at slower cooling rates. However, all of the FG-GA coacervate gels obtained at different cooling rates were classified as a weak physical gel.Copyright Â© 2016 Elsevier B.V. All rights reserved.
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