• Food Science of Animal Resources
• /
• v.35 no.2
• /
• pp.248-257
• /
• 2015

Effects of double packaging (combinational use of aerobic and vacuum conditions) and antioxidants on physicochemical properties in irradiated restructured chicken rolls were determined. Chicken breast treated with antioxidants (none, sesamol+a-tocopherol) was used to process restructured chicken breast rolls. The sliced rolls were vacuum, aerobic, or double packaged (vacuum for 7 d then aerobic for 3 d) and electron beam irradiated at 2.5 kGy. Color, 2-thiobarbituric acid reactive substances (TBARS), oxidation reduction potentials (ORP), and volatile profiles of the samples were determined at 0 and 10 d. Irradiation made restructured chicken rolls redder (p<0.05), and the increased redness was more distinct in irradiated vacuum-packaged than irradiated aerobic or double packaged meats. TBARS values of antioxidant-treated double packaged rolls were lower than even nonirradiated vacuum-packaged meat, and those were distinct at 10 d (p<0.05). ORP and lipid oxidation values were lower in irradiated vacuum and double packaged samples than those in irradiated aerobic packaged ones at 0 d (p<0.05). Irradiation of restructured chicken rolls increased the amount of total volatiles. Considerable amounts of off-odor volatiles were reduced or not detected by double packaging and antioxidant treatment at 10 d. Therefore, the combined use of antioxidants and double packaging would be useful to reduce redness and control the oxidative quality changes of irradiated restructured chicken rolls

• Journal of the Korean Magnetic Resonance Society
• /
• v.6 no.1
• /
• pp.69-77
• /
• 2002

During the screening of material which has the antimicrobial activity against aminoglycoside-resistant bacteria, A new material $\varepsilon$-(L-$\beta$-Iysine) polypeptide from a culture medium of Streptomyces sp.(DWGS2) was isolated, and the structure and the physicochemical properties of the new material were elucidated. The new material was separated by column chromatography of the culture medium using Dowex1$\times$2, Silica gel, and Sephadex LH20 etc. The chemical structure and molecular weight were determined with the data of various NMR experiments, MALDI mass, and ESI mass experiments. The antimicrobial activity of $\varepsilon$-(L-$\beta$-Iysine) polypeptide is not only better than equal to the activity of known aminoglycoside type of antibiotics(MIC=3.125 - 6.25ug/mL) but also effective against aminoglycoside-resistant bacteria and fungi. If the mechanism of antimicrobial activity against aminoglycoside- resistant bacteria is figured out, the $\varepsilon$-(L-$\beta$-Iysine) polypeptide can be utilized for the treatment of diseases caused by aminoglycoside-resistant bacteria.

• Proceedings of the Korean Environmental Health Society Conference
• /
• 2003.06a
• /
• pp.116-122
• /
• 2003

The physicochemical properties of fungal chitosan at 95$^{\circ}C$ and 40$^{\circ}C$ acid treatment was as follows respectively. The nitrogen content was 6.71%, 6.91%, the viscosity 2.23cps, 2.21cps, the acetylation 12.0%, 12.7% and the molecular weight 3.12${\times}$10$\^$5/ Dalton, 3.01${\times}$10$\^$5/ Dalton. The absorbency band of reference, FCs-40 and FCs-95 in I.R. spectra was almost in accord with one another. In solid state NMR spectra, methyl group(-CH$_3$) was observed lightly. That means which deacetylation was well occurred. Carbonyl group(C=O) was not observed. C$_1$ to C$\_$6/ in solid state NMR was well observed seperately enough.

• Journal of the Korean Society of Food Science and Nutrition
• /
• v.27 no.3
• /
• pp.367-375
• /
• 1998

The physicochemical properties of the $\alpha$-amylase inhibitors from black bean and naked barley is Korea were investigated. Preincubation time for maximum inhibition was 30min and no activity change was seen after that time. Optimum pH of the $\alpha$-amylase inhibitors from the black bean and naked barley was pH 7.0 and the inhibitory activities were stable in the range of pH 6.0~8.0 in both phosphate and Tris-HCI buffer solutions. Both inhibitors maintained more than 50% of activity after incubation for 17 min at 7$0^{\circ}C$. The inhibitors from the black bean and naked barley maintained more than 50% of activities after treatment for 40 min and 30 min with pepsin, and 30 min and 50 min with trypsin, respectively. Both inhibitors functioned via a noncompetitive mechanism and were active against porcine pancreatic and human salivary $\alpha$-amylases. The activities of both inhibitors were linear for the ionic stength ranging from 0 to 0.9. The addition of 70 mM maltose to the reaction mixture caused a maximum increase in the relative activities of both inhibitors, but it did not affect the dissociation of the EI complex. The activities of both inhibitors were significantly enhanced by adding 1mM of K+ or Mg2+.

• Korean Journal of Soil Science and Fertilizer
• /
• v.41 no.5
• /
• pp.324-329
• /
• 2008

A coal mine drainage sludge(designated as CMDS) is mainly generated during physicochemical treatment or electrical purification of the drainage abandoned mine that include dissolved heavy metal. To understand the possibility of an application of the dehydrated CMDS as the landfill cover medium of hygienic a reclaimed ground, an laboratory experiment was performed to investigate the physicochemical and geoengineering characteristics of the dehydrated CMDS. To improve the geoengineering characteristics of the dehydrated CMDS, the liquid limit, plasticity limit test, compaction method test, strength test, and hydraulic conductivity test ware performed with the lithification material mixed sludge. When the mixed ratio of the sludge and the lithification material was more than 1:06, the compaction method was A method, the moisture content less than 33.5%, the strength of mixed sludge was $8.2kg\;cm^{-2}$, the hydraulic conductivity was $2.7\times10^{-6}cm\;sec^{-1}$, the sludge was up to the landfill standard of US Environmental Protection Agency (US EPA).

• Korean journal of food and cookery science
• /
• v.31 no.1
• /
• pp.83-90
• /
• 2015

This study was performed to evaluate the effects of adding aronia powder on the antioxidant activities and physicochemical properties of pork patties. The patties were prepared by adding 0%, 1%, 2%, and 3% of aronia powder. Water and ethanol were used to extract the antioxidant compounds from aronia. Total phenolic compounds of the water and ethanol extract of aronia were 164.55 mg/g and 221.08 mg/g, respectively. The total phenol contents and DPPH free radical scavenging activity of patties were significantly increased with the increasing amount of aronia powder. Moisture content in control group was 60.61%, and it was significantly different from the aronia powder groups. The cooking loss rate and reduction ratio significantly decreased with the increasing amount of aronia powder. The hardness, chewiness, and gumminess of the control group were lower than those of the treatment group. In the sensory evaluation, the addition of 1% aronia received the best score in appearance, color, and overall preference. We suggest that aronia powder may be a useful ingredient in pork patties to improve the quality characteristics and antioxidant potential.

• Journal of Powder Materials
• /
• v.20 no.6
• /
• pp.479-486
• /
• 2013

In the present work, physicochemical treatments were introduced for de-aggregation and stable dispersion of detonation nanodiamonds (DND) in polar solvents. The DNDs in water exhibited a particle size of 138 nm and high dispersion stability without particular treatment. However, the DNDs in ethanol were severely aggregated to several micrometers in size and showed poor dispersion stability with time. To break down aggregates of DNDs and enhance the dispersion stability of them in ethanol, mechanical force and chemical surfactant were introduced as functions of zirconia ball size, kind of surfactant and amount of surfactant added. From the analyses of average particle size and Turbiscan results, it was suggested that the size of DNDs in ethanol can be reduced by only mechanical force; however, the DNDs were re-aggregated due to high surface activity. The long-term dispersion stability can be achieved by applying mechanical force to break down the aggregates of DNDs and by preventing re-aggregation of them using proper surfactant.

• Textile Coloration and Finishing
• /
• v.24 no.2
• /
• pp.121-130
• /
• 2012

Cotton fabrics were treated with some commercial non-formaldehyde and low-formaldehyde resins, and then their effect on the physicochemical properties were respectively investigated including formaldehyde release, tear strength, shrinkage, and wrinkle recovery. Formaldehyde release less than 10ppm was obtained only by non-formaldehyde resin. Considering other factors, the optimal concentration of non-formaldehyde resin was shown to be 9-11%. In case of low-formaldehyde type, 5-7% resin concentration and curing temperature of $160{\sim}170^{\circ}C$ were recommended for optimal finishing condition. The choice and combination of resins and catalysts were also important factors, and preliminary considerations before treating cotton fabrics with resins used in this study are also important to get much better results.

• Journal of the Korean Chemical Society
• /
• v.48 no.6
• /
• pp.623-628
• /
• 2004

Zeolite SUZ-4 was successfully synthesized with TEAOH (Tetraethyl ammonium hydroxide) as structure directing agent under a vigorous stirring condition. Well-defined zeolite SUZ-4 structure was only obtained under stirring of 250 rpm or more. The results imply that stirring plays a pivotal role for reproducible synthesis. Morphology of SUZ-4 crystal was controlled by adjustment of water concentrations. The physicochemical characterization of SUZ-4 and its hydrothermal stability using a steam treatment were investigated by using XRD, BET, and $NH_3-TPD$.

• Korean Journal of Food Science and Technology
• /
• v.32 no.1
• /
• pp.69-74
• /
• 2000

Varietal difference in physicochemical characteristics of glutinous rice grain and interrelationships between these properties and the quality characteristics of Yukwa(fried rice cookie) were investigated on fourteen rice varieties, to obtained the basic informations for diversifying the utility of glutinous rice grain and for developing various glutinous rice cultivars adaptable to glutinous rice food processing. Among physicochemical properties of glutinous rice grain, the content of released reducing sugar during soaking treatment was the most positive correlation between the adaptability to Yukwa processing quality. CB243 and Sandong 71 were the most adaptable glutinous rice cultivars to make the Yukwa, because of its tested score in expansion volume, crispiness and sensory preference was higher than other glutinous rice cultivars.