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Physicochemical and Functional Properties of Chitosans Prepared from Ground and Entire Squid Pens
( Sung Mi Byun ),( Hong Kyoon No ),( Witoon Prinyawiwatkul ) 한국키틴키토산학회 2012 한국키틴키토산학회지 Vol.17 No.2
Selected physicochemical, binding, antioxidant, and antibacterial properties of chitosans prepared from ground (designated as G-chitosan) and entire (designated as E-chitosan) squid (Todarodes pacifica) pens were evaluated. G-chitosan had significantly lower nitrogen content, degree of deacetylation (%), color lightness (L*) and redness (a*) values, but higher bulk density, viscosity and color yellowness (b*) values than E-chitosan. Compared with E-chitosan, G-chitosan exhibited higher waterbinding capacity, dye-binding capacity and antibacterial activity against two gram-negative (Salmonella Enteritidis and Escherichia coli) and two gram-positive (Listeria monocytogenes and Staphylococcus aureus) bacteria. However, it exhibited lower fat-binding capacity and DPPH radical scavenging activity. This study demonstrated that chitosans prepared from ground and entire squid pens exhibited differences in their physicochemical and functional characteristics.
No, Sang Tae,Hong, Seung Hun,Kim, Jae Yeob Trans Tech Publications, Ltd. 2012 Applied Mechanics and Materials Vol. No.
<P>The objective of this study is to investigate the file exchange compatibility of BIM based building energy simulation tools, especially focusing on various irregular building geometry shapes. As a base building modeling software, AUTOCAD Revit was selected and various building geometry shapes were created using Revit, such as curved and pitched walls, roofs, slabs with various air-conditioning zones. And these various shaped building zones were imported to ECOTECT, IES/VE and Openstudio for EnergyPlus, which are professional building energy simulation tools. Through this create-import process, the deformation of building shapes, change of zone volume, and compatibility to each simulation engine were investigated and analyzed.</P>
( Sung Mi Byun ),( Hong Kyoon No ),( Chang Su Park ) 한국키틴키토산학회 2012 한국키틴키토산학회지 Vol.17 No.3
Physicochemical, binding, and antioxidant properties of chitosans (designated as RT-chitosan, SD-chitosan, and OD-chitosan, respectively) prepared from squid pens dried by three different methods (room temperature drying, sun drying, and oven drying) were evaluated. Nitrogen and ash contents of three chitosans were not affected by drying methods of squid pens. However, RTchitosan had higher degree of deacetylation, dye-binding capacity, and DPPH radical scavenging activity, but lower viscosity and color a* (redness) value than SD-chitosan and OD-chitosan. OD-chitosan exhibited higher viscosity, color a (redness) value, water-binding capacity, and fat-binding capacity compared with RT-chitosan and SD-chitosan.
Evaluation of the Weldability in Spot Welding using Ultrasonic Technique
Hong, Min-Sung,Kim, No-Hyu The Korean Society for Nondestructive Testing 2005 한국비파괴검사학회지 Vol.25 No.3
Spot welding is the most widely used in automotive and aerospace industries. The quality of weld depends upon the size of nugget between the overlapped steel plates. Recently, the thickness of the steel plates is much thinner and hence, it introduces the smaller size of nugget. Therefore, it is necessary not only to develop the criterion to evaluate the quality of weld but also to obtain the optimal welding conditions for the better performance. In this paper, the steel plates, 0.5 mm through 1.5 mm thickness, have been spot welded at different welding conditions and the nugget sizes are examined by ultrasonic technique (C-scan type). The relationships between the nugget sizes and the weldability have been investigated. The result of ultrasonic technique shows the good agreement with that of the tensile test.
( Hong Kyoon No ),( Dal Kyoung Youn ),( Sung Mi Byun ) 한국키틴키토산학회 2011 한국키틴키토산학회지 Vol.16 No.4
Selected physicochemical and functional properties of chitosans prepared from crab leg and abdomen shells were evaluated. The leg shell contained comparable protein (29.50% vs. 27.47%) and ash (47.70% vs. 48.40%) but lower fat (0.53% vs. 0.73% ) and chitin (21.09% vs. 22.73%) contents compared with the abdomen shell. Physicochemical characteristics of chitosans somewhat differed depending on the parts of crab shell. Chitosan from leg shell (leg chitosan) showed lower degree of deacetylation (89.13% vs. 91.48%) but higher viscosity (1424.67 mPa s vs. 559.90 mPa s) and bulk density (0.34 g/mL vs. 0.31 g/mL) than chitosan from abdomen shell (abdomen chitosan). Leg chitosan had comparable L* but higher a* and b* values than abdomen chitosan. Higher water-, fat-, and dye-binding capacities and DPPH radical scavenging activity were observed with abdomen chitosan, having higher degree of deacetylation and lower viscosity and bulk density.
( Sung Mi Byun ),( Dal Kyoung Youn ),( Hong Kyoon No ),( Joo-heon Hong ),( Witoon Prinyawiwatkul ) 한국키틴키토산학회 2012 한국키틴키토산학회지 Vol.17 No.2
Selected physicochemical and functional properties of two squid pen β-chitosans, chitosan-WDM and chitosan-DM, respectively, prepared without and with a demineralization step (DM) were compared. Chitosan-WDM had comparable degree of deacetylation, but higher ash content and viscosity compared with chitosan-DM. Chitosan-WDM also possessed greater water-binding (WBC) and fat-binding (FBC) capacities, but lower DPPH radical scavenging activity compared with chitosan- DM. Both chitosans exhibited similar dye binding capacity. Thus, production of squid pen β-chitosan-WDM is advantageous if higher viscosity, WBC and FBC are desirable. However, to produce squid pen β-chitosan with low ash content and improved antioxidant property, DM should be considered.