This experiment was carried out to examine sensory testing for Mozzarella cheese, process cheese, Cheddar cheese and Cheddar cheese made with red pepper, garlic, ginger and welsh onion to develop new cheese varieties which can be prefered by Korean. The chemical composition and sensory testing of cheese were measured. The results were summarized as follows ; 1. Total nitrogen percentages in Cheddar cheese and spiced Cheddar cheeses were similar but those in process cheese and Mozzarella cheese were low. 5% NaCl soluble nitrogen percentages were highest in Cheddar cheese. 5% NaCl soluble nitrogen percentages in each cheese were different. Ripening degree, water soluble nitrogen, TCA soluble nitrogen and SSA soluble nitrogen percentages in each cheese were similiar level. 2. Spiced Cheddar cheeses were more breakdown than other cheese and ${\alpha}_s$-casein breakdowns faster than $\beta$-casein. 3. In the result of sensory evaluation, color score was high in Mozzarella cheese and process cheese. The color score of Cheddar cheese was high in 30's-40's and 50's- 50's. The color score of 10's and 20's was high in Cheddar cheese made with garlic. 4. Odor score was high in Mozzarella cheese and process cheese, too. The odor score of Spiced Cheddar cheeses was high in 10's. 5. Texture score was high in Mozzarella cheese, process cheese and Cheddar cheese. 6. Teste score was high in Mozzarella cheese, process cheese and Cheddar cheese. The taste score of spiced Cheddar cheese was higher in 10's and 20's than that in 30's-40's and 50's-50's.
Lee, Sunghee;Kang, Eungu;Kim, Yoonmyung;Lee, Beom Hee;Kim, Gu Hwan;Yoo, Han Wook
Journal of The Korean Society of Inherited Metabolic disease
/
v.16
no.2
/
pp.93-101
/
2016
Purpose: McArdle disease, glycogen storage disease type V (GSD V), is one of the most common adolescent-onset glycogen storage diseases. It is caused by recessive mutations in PYGM encoding myophosphorylase, which is critical to glycogen metabolism. Since only a few korean patients have been reported, we will observe the clinical and genetic features of three korean patients with McArdle disease. Methods: We retrospectively reviewed the medical records of three patients with genetically confirmed McArdle disease, including the results of forearm ischemic exercise test, electromyogram, nerve conduction velocity, muscle biopsy, and PYGM analysis in peripheral leukocytes. Results: All three cases were males and their age of symptom onset was 12, 5, 14 years old, respectively. A high basal level of serum creatine kinase was noted in all three patients. They experienced the recurrent episodes of rhabdomyolysis, but second wind phenomenon was not definite. In muscle biopsy, subsarcolemmal space vacuoles including periodic acid schiff stained materials were found in two patients, while no evidence of glycogen storage disease was found in the other. A total of five different mutations, $p.Arg50^*$, p.Trp798Arg, $p.Arg50^*$, p.Glu779del, $p.Asp511Thrfs^*28$ and p.Phe710del, were found in three patients. Avoidance of isometric exercise, aerobic exercise and glucose intake before each exercise were recommended for all patients. Conclusion: The three Korean patients with McArdle disease showed the typical manifestations of the condition. The most mutations were private. Therefore, identification of more cases with long-term follow-up will be required to understand the clinical and genetic features of this disease among Korean population.
The lactate dehydrogenase (EC 1.1.1.27, LDH) isozymes in tissues from Acanthogobius hasta were characterized by biochemical, immunochemical and kinetic methods. The activities of LDH in skeletal muscle and eye tissues were 65.30 and 53.25 units, but LDH activities in heart and liver tissues were very low. LDH/CS (EC 4.1.3.7, citrate synthase) in skeletal muscle was the highest as 22.29. Specific activities of LDH in brain, eye and skeletal muscle were 56.45, 38.04 and 11.0 units/mg, respectively. The LDH isozymes in tissues were separated by polyacrylamide gel electrophoresis after immunoprecipitation with antiserum against $A_4,\;B_4$ eye-specific $C_4$ and liver-specific $C_4$. LDH $AC_4$ isozymes were detected predominantly in skeletal muscle, brain and eye tissues, and $B_4$ isozyme was detected in heart. Anodal eye-specific $C_4$ and cathodal liver-specific $C_4$ were coexpressed in A. hasta. The eye-specific $C_4$ isozyme showed higher activity in eye tissue, but liver-specific $C_4$ isozyme showed lower activity in liver. As a result, one part of molecular structures in $A_4\;and\;C_4,\;A_4\;and\;B_4$, and eye-specific $C_4$ and liver-specific $C_4$ were similar, but in $B_4\;and\;C_4$ were different with each other. Therefore the subunit A may be conservative in evolution, and the evolution of subunit B seems to be faster than that of subunit A. The LDH $A_4$ isozyme of skeletal muscle was purified in the fraction from elution with NAD+ containing buffer of affinity chromatography and eye-specific $C_4$ isozyme was eluted right after $A_4$, so the structure of eye-specific $C_4$ isozyme is similar to $A_4$. And LDH activity remained 35.22-43.47% as a result of the inhibition by pyruvate, the Michaelis-Menten constant values for pyruvate was 0.080-0.098 mM, and Vmax were 153.85 units, 35.09 units in skeletal muscle and eye, respectively. Also the $B_4$ isozyme was the thermo-stablest and $C_4$ was stabler than $A_4$ isozyme. The optimum pH of LDH was 6.5. The results mentioned above indicate that isozymes in tissues showed the properties between LDH $A_4\;and\;B_4$ isozyme as A. hasta was adapted to hypoxic conditions. Also LDH seems to function more effectively under anaerobic condition because LDH in skeletal muscle and eye tissues have high affinity for pyruvate.
In order to study and ecotypic variation of Phragmites communis Trin., we investigated germination rates, velocities, and protein band patte군 of seeds of three population of salt marsh, estuary and fresh water areas of Muan Peninsular in southwestern coast of Korea from March, 1990 to October, 1992. The highest germination rates of seeds were observed at $25^{\circ}C$; those of population of the estuary and fresh water are were 100% and that of the salt marsh was 95%. Similar germination rates were observed from the populations of estuary and fresh water areas at $30^{\circ}C$ and $20^{\circ}C$, but they decreased at $15^{\circ}C$. The onset of germination of seeds of three population was earlier $^{\circ}C$, but they decreased at $15^{\circ}C$. The onset of germination of seeds of th three populations was earlier at both $25^{\circ}C$, which was higher than those of any other areas, while that of fresh water areas was the lowest. were different; those of salt marsh and estuary decreased to 30% and 2.5%, respectively, at 3.0% of salt content, but seeds of the fresh water area did not germinate at all at the same salt content. The onset of germination was delayed in the order of the salt marsh, esturay and fresh water areas as salt content of culture solution increased. Germination of seeds from the population of salt marsh was found to begin earliest. The highest germination velocity of three populations was observed in the culture containing no salt. The germination velocity constant decreased as salt content of culture solution increased from 0.5% to 3.0%: those of the populations of the salt marsh, estuary, and fresh water areas were 9.50, 0.75 and 0.00, respectively, at the salt concentration of 3.0%. Soluble protein patterns of seedings from the three populations were analyzed by SDS-PAGE method. The results showed that protein patterns of the three populations were distinctly different qualitatively and quantitatively. The present study suggests that populations of Phragmites communis Trin. in the coast of Korea had taken ecotypic variations of habitats, i.e., fresh water, estuary, and salt marsh types, according to the salt content.
Yoon, Hyung Sik;Kwon, Joong Ho;Bae, Man Jong;Hwang, Joo Ho
Journal of the Korean Society of Food Science and Nutrition
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v.12
no.1
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pp.46-50
/
1983
In order to find out the possibility of utilizing red pepper seed as food resources of fats and proteins, a series of studies were conducted. The red pepper seed contained 27.6% of crude fat and 22.2% of crude protein. The lipid fractions obtained by silicic acid column chromatography were mainly composed of 95.4% neutral lipid, where as compound lipid were 4.6%. Among the neutral lipid separated by thin layer chromatography, triglyceride was 85.6%, sterol ester 4.9%, free fatty acids 3.4%, diglyceride 2.5%, sterol 2.2% and monoglyceride 1.1%, respectively. The predominant fatty acids of red pepper seed oil were linoleic acid (57.1-75.4%), palmitic acid (13.9-21.3%) and oleic acid (8.0-15.1%), especially glycolipid contained 1.7% of linolenic acid and small amount of myristic acid and arachidic acid. The salt soluble protein of red pepper seed was highly dispersible in 0.02M sodium phosphate buffer containing 1.0M $MgSO_4$, and the extractability of seed protein was about 25.0%. Glutamic acid and arginine were major amino acids of red pepper seed protein. The electrophoretic analysis showed 6 bands in seed protein, and the collection rate of the main protein fraction purified by sephadex G-100 and G-200 was about 62.2%. Glutamic acid (19.9%) was major amino acid of the main protein, followed by glycine and alanine. The molecular weight of the main protein was estimated to be 93,000.
Mitochondrial DNA mutations have been reported in recent years in association with sensorineural hering loss. The purpose of this study is to identify the association between the noise-induced sensorineural hearing loss and the A to G mutation at nucleotide 3243, 1555, 7445 of mitochondrial DNA. Study subjects were established by history and chart review, and audiological and clinical data were obtained. Blood was sampled from 214 normal controls, 102 noise-induced hearing loss, and 28 sensorineural hearing loss. The DNA of these individuals were extracted, and mitochondrial DNA fragments were analyzed by polymerase chain reaction. Subsequently, the coding sequence of mitochondrial DNA 3243, 1555, 7445 were sequenced, and compared to the normal sequence, and all sequence variations were analyzed by restriction enzymes. Mitochondrial DNA mutations $(3243A{\rightarrow}G,\;1555A{\rightarrow}4G,\;7445A{\rightarrow}G)$ were not detected by polymerase chain reactions in any patients with noise-induced hearing loss, sensorineural hearing loss, and normal controls. The DNA sequencing of PCR products did not revealed an A to G substitution at nucleotide 3243, 1555, 7445 of mitochondrial DNA. The noise-induced sensorineural hearing loss was not associated with mitochondrial DNA mutation $(3243A{\rightarrow}G,\;1555A{\rightarrow}4G,\;7445A{\rightarrow}G)$.
This study was conducted to investigate the genotypes and frequencies of Melanocortin 1 Receptor(MC1R) genes in pigs which plays a central role in regulation of eumelanin (black/brown) and phaeomelanin(red/yellow) pigment synthesis within the mammalian melanocytes. Four different breeds of pigs(20 Landrace, 20 Yorkshire, 20 Duroc, and 93 Jeju native black pigs) were used and PCR-RFLP analysis of MC1R gene was also carried out. Two regions of MC1R genes (428bp and 405bp) were amplified using two specific primers (MERL1-EPIG2, EPIG1-EPIG3), respectively and MC1R allele were determined using 2 restriction enzymes (BspHⅠ, AccⅡ). The results of this experiment indicated that MC1R allelic type in Landrace, Large Yorkshire and Duroc were MC1R *2 (Ep), MC1R *2 (Ep), MC1R *4 (e), respectively. However, various allelic types of MC1R genes were detected in Jeju native black pigs. MC1R allelic type of Jeju black pigs was MC1R*2 type as in Meishan and Large black breeds or MC1R*3 type as in Hampshire and Berkshire breeds and the gene frequencies of ED1 and ED2 were 0.554 and 0.446 in average.
Processed meals, such as a ground meat and hamburger patty, are required to ensure that no pathogens remain in the final products. However, there was no rapid method available to verify that the recommended end-point cooking temperature(EPT) was reached. Thus, the objective of this study was to rapidly determine EPT of ground pork hams using sodium dodecyl sulfate-polyacrylamide gel electrophoresis(SOS-PAGE), based on the disappearance of sarcoplasmic proteins after cooking. Fresh pork hams were added two levels of salt(0, 2%) and fat(15, 25%) combinations, and stored in refrigerator overnight, and cooked to internal cooking temperatures of $64^{\circ}C$ to $74^{\circ}C$ with $2^{\circ}C$ increments. Cooked pork hams were measured cooking loss(CL, %), protein solubility(PS) and SOS-PAGE. CL(%) was reduced with the addition of 2% salt, as compared to the control, regardless of fat contents. It was also increased with increasing eooking temperature. Protein solubility was affected by the cooking temperature, resulting in reduced PS up to $64^{\circ}C$(P < 0.05), but remained constant higher than $68^{\circ}C$. In SOS-PAGE analysis, protein bands with the molecular weights of 36 and 66 kDa were affected by the addition of salt and fat combinations. regardless of treatments. These protein fractions were decreased gradually with increased cooking temperatures up to $68^{\circ}C$${\sim}$$70^{\circ}C$ and might be good indicators for the determination of EPT in ground pork hams.
A series of studies were conducted to find out the possibility of utilizing grape seed as resources of food fats and proteins, and the results of the studies are as follows: The grape seed contained 25.1%, of crude fat and 12.0% of crude protein. The lipid, fractions obtained by silicic acid column chromatography were mainly composed of about 95.5% neutral lipid, whereas compound lipid was only 4.5% level. Among the neutral lipid by thin layer chromatography, triglyceride was 91.89%, sterol ester, sterol, diglyceride and free fatty acid were 3.24%, 2.87%, 1.20% and 0.80%, respectively The predominant fatty acids of total and neutral lipids were linoleic acid $(69.72{\sim}71.72%)$ and oleic acid $18.09{\sim}19.46%)$, but those of glycolipid and phospolipid were linoleic acid $(31.49{\sim}38.18%)$, oleic acid $(20.20{\sim}35.27%)$ and palmitic acid $(26.80{\sim}39.98%)$. The major fatty acids of triglyceride separated from neutral lipid were oleic acid (43.08%), linoleic acid (38.42%) and palmitic acid (11.60%). The salt soluble protein of grape seed was highly dispersible in 0.02M sodium phosphate buffer containing about 1.0M $MgSO_4$, and the extractability of seed protein was 31%. Glutamic acid was the major amino acid in salt soluble protein, followed by arginine and aspartic acid. The electrophoretic analysis showed 3 bands in grape seed protein, and the collection rate of the main protein fraction purified by Sephadex G-100 and G-200 was 82%. Glutamic acid, aspartic acid and arginine were the major amino acids of the main grape seed protein. The molecular weight for the main protein of the grape seed was estimated to be 81,000.
This study was carried out to determine sex of porcine embryos produced by in vitro fertilization. Porcine oocyte-cumulus complexes were cultured in BSA-free North Carolina State University (NCSU) 23 medium containing porcine follicular fluid (10%), cystein (0.1 mg/ml) and hormonal supplement (10 IU eCG and 10 IU hCG per ml) for 20~22 hrs. They were then cultured in the same medium but without hormonal supplement for additional 20~22 hrs. After culture, cumulus cells were removed and oocytes were co-incubated for 6 hrs with four different concentrations (5$\times$10$^4$, 2.5$\times$ 10$^{5}$ , 5.0$\times$10$^{5}$ and l0$\times$10$^{5}$ ) of porcine sperm. After fertilization, oocytes were transferred into NCSU 23 with 0.4% BSA medium. The cleavage and blastocyst formation rates were evaluated at 48 and 144 hrs, respectively. In this study, the polymerase chain reaction (PCR) was used to determine the sex of porcine embryos in the stage of blastocyst. The PCR was performed using a set of oligonucleotide primers (5‘-TCATGGACCAGGTAGGGAAT-3', 5’-GAAAGACACGTCCTTGGA GA-3') for 491 bp fragment of porcine male-specific DNA sequence. In the flour different sperm concentration (5$\times$10$^4$, 2.5$\times$10$^{5}$ , 5.0$\times$10$^{5}$ and l0$\times$10$^{5}$ ) for fertilization condition, the cleavage rate was 55.95, 67.88, 60.18 and 47.60%, respectivety, and the development rate of blastocysts was 16.03, 20.40, 21.41 and 12.37%, respectively. At 5.0$\times$10$^4$and 2.5$\times$10$^{5}$ of sperm concentrations per ml cleavage rate and development rate of blastocyst were higher than those of 5.0$\times$10$^4$and l0$\times$10$^{5}$ of sperm concentration (P<0.01). The male of porcine embryos was detected at 491 bp by PCR, and 18 of the 31 porcine blastocysts were the male (58.1%) and the rest 13 were the female(41.9%).
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