Kim, Jin Sook;Kim, Ja Young;Kim, Gi Chang;Kim, Kyung Mi;Kang, Myung Hwa
Journal of the Korean Society of Food Science and Nutrition
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v.42
no.7
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pp.1071-1078
/
2013
We conducted this study in order to investigate the quality and antioxidant properties of saccharifed banana gruel containing different levels (0, 15, 30, and 45%) of banana puree. Saccharified banana gruel with different ratios of banana was prepared and proximate composition, sweetness ($^{\circ}brix%$), pH, total acidity, Hunter's color value, viscosity, free sugar, sensory evaluation, and physiological activities of the sample were measured. With increasing banana content, proximate composition, sweetness, and acidity of banana gruel increased, and pH showed a significant decrease (P<0.05). Saccharified banana gruel prepared with 15~45% banana showed significantly lower viscosity. As the level of banana increased, L-value decreased, whereas the a-value, b-value increased. Free sugar content of fructose, glucose, maltose, and sucrose showed a significant increase (P<0.05). Saccharified banana gruel with 30% added banana was the most preferred for color, flavor, taste, mouth-feeling, texture, and overall acceptability. The total phenolic compound contents of saccharified banana gruel with banana puree ranged from 1.73 to 5.75 mg/g. DPPH and ABTS radical scavenging activities of saccharified banana gruel with banana puree were 8.67~31.26% and 6.02~55.16%, respectively. With increasing banana content, total polyphenol contents, DPPH and ABTS radical scavenging activity of banana gruel showed a significant increase (P<0.05). From these results, we found that addition of 30% banana was the best method for preparation of gruel with high sensory quality.
To develop commercial semi-solid apple baby food, the physicochemical characteristics of apple puree in relation to different preparing methods and the effect of the addition methods of ascorbic acid on browning reaction were investigated. The preparing methods were classified into 3 groups by initial heating treatment: no heating (A), steaming at $120^{\circ}C$ (B), and blancing at $100^{\circ}C$ (C). The viscosity of tested apple puree was $2,600{\sim}5,856\;cp$, and contents of anhydrogalaturonic acid (AGA) and neutral sugar ranged $4.15{\sim}11.92\;mg%$ and $6.18{\sim}10.65\;mg%$, respectively. Among free sugars tested, level of fructose was the highest $(5.43{\sim}8.87%)$, followed by glucose $(2.11{\sim}4.23%)$, sucrose $(1.64{\sim}2.94%)$, in that order. Since small amounts of ascorbic acid were detected $(1.54{\sim}1.83\;mg%)$, it seemed to be lost by heating process in preparing of apple puree. For apple puree A, its lightness was lower and redness was higher than those of apple puree B and C. Its degree of browning of apple puree was so high that sodium ascorbic acid was added as a antibrowning agent. Puree had low sensory score and nutrient quality. The adding methods of ascorbic acid were classified into 4 groups by adding time: dipping, blending (2), heating (3), and blending + heating (4). Considering color and preference evaluation, preparing method B and adding method 2 showed the highest inhibitory activity on apple puree browning and desirable color for retort baby food. After retort sterilization, the viscosity of apple baby food was decreased from 3,477 cp to 2,294 cp, thiamin was destroyed completely, and the contents of riboflavin and ascorbic acid were decreased 41% and 21%, respectively. However, contents of free sugar and free amino acid and sensory parameter were not influenced by retort sterilization. In overall, the preparing method B-adding method 2 was a good processing condition for the retort apple baby food.
The experiment was conducted to investigate the effects of feeding herbaceous peat on growth performance and meat quality of Holstein beef cattle. Total of 20 Holstein beef cattle (18~20 month of age, $657{\pm}31kg$ body weight) were conventionally and separately fed a concentrate diet and rice straw for 134 days. The dietary treatments were randomly assigned by complete block design into four treatments, each of which were five heads in early fattening stage. The treatments in this study were the control group fed basal diet, feeding herbaceous peat group (5%/diet, T1), feeding coated vitamin C group (20g/head, T2) and feeding mixture of herbaceous peat and coated vitamin C group (5%/diet+20g/head, T3). The initial body weights between the groups of control, T1, T2 and T3 were similar showing with $689{\pm}31$, $661{\pm}24$, $659{\pm}32$ and $622{\pm}19kg$. The daily body weight gain was higher in T3 by 8.3% than that in the control (p<0.05). Glucose concentration in control group was the highest among treatments (p<0.05), but there was no significant differences between treatments on AST (aspartate aminotransferase), ALT (alanine aminotransferase), BUN and total protein concentrations of blood. The fat content of sirloin in the T2 was significantly higher than control and T1 group (p<0.05). Meat color (CIE) values in T2 was the highest among treatments (p<0.05), and other treatments also increased those values. In overall, the feeding herbaceous peat and vitamin C to the Holstein beef cattle was considered to have positive effects on the growth performance of Holstein beef cattle. In addition, the effects on the performances of animals were more improved when fed herbaceous peat and vitamin C concurrently.
Mallory, Larry M.;Yuk, Chang-Soo;Liang, Li-Nuo;Alexander, Martin
Korean Journal of Soil Science and Fertilizer
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v.16
no.4
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pp.358-367
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1983
Antibiotic-resistant strains of Salmonella typhimurium and Klebsiella pneumoniae died readily after their addition to raw sewage, but they grew in sterilized sewage. The decline was not a result of antibiotic stresses, and because the bacteria were able to survive in large numbers for at least 15 days in solutions containing no organic nutrients, it was not a result of competition. Toxin production, bacteriophages, and Bdellovibrio did not cause the disappearance of the two bacterial species. A decline was also evident if the sewage was first passed through a $3-{\mu}m$ filter or treated with cycloheximide or cycloheximide plus nystatin, but protozoa developed under these conditions. Little or no decline occurred if the sewage was filtered and treated with the eucaryotic inhibitors before adding S. typhimurium or K. pneumoniae, and protozoa were not detected. S. typhimurium increased in abundance if cycloheximide, streptomycin, and erythromycin or large amounts of glucose were added to sewage. Tetrahymena thermophilus did not significantly reduce the population of S. typhimurium in buffer when the density of the bacterium was about $10^4/ml$. However, when more than $10^8$ Enterobacter agglomerans cells per ml were added to the buffer, T. thermophilus reduced the abundance of E. agglomerans and S. typhimurium to $10^6$ and 10/ml, respectively. The density of S. typhimurium was further decreased by a second increment of E. agglomerans cells. The disappearance of S. typhimurium and K. pneumoniae from sewage thus is the result of predation by protozoa. It is proposed that predators will eliminate a prey species from a natural environment when an alternate prey is present at concentrations above the threshold number for active feeing by the predator and when the rate of growth of the prey is less than the rate of predation.
The physicochemical properties and gel forming properties of mungbean and buckwheat crude starches were investigated. The results were as follows; 1. The granule size and shape of mungbean crude starch were $11~32\mu\textrm{m}$ and oval, and those of buckwheat crude starch were $3~10 \mu\textrm{m}$ and polygonal. 2. The amylose conteut of mungbean crude starch and buckwheat crude starch were 78.0% and 26.4% respectively. 3. The blue value of mungbean crude starch and buckwheat crude starch were 1.030 and 0.409, respectively. 4. Periodate oxidation of mungbean crude starch resulted that amylose had the average molecular weight of 95, 648, degree of polymerization of 590 and amylopectin had the degree of branching of 5.4, glucose unit per segment of 18.6, and periodate oxidation of buckwheat crude starch resulted that amylose had the average molecular weight of 133, 690, degree of polymerization of 825 and amylopectin had the degree of branching of 5.2, glucose unit per segment of 19.2 5. Water binding capacity of mungbean crude starch was 185.1% and that of buckwheat was 209.9% 6. The pattern of change in swelling power of mungbean crude starch for increasing temperature started to increase at $60^{\circ}C$ and increased rapidly from $70^{\circ}C$, and that of buckwheat increased slowly from $60^{\circ}C$ to $90^{\circ}C$ without rapid increase. 7 The ranges of gelatinization temp. of mungbean and buckwheat crude starches were 63. 9-$109^{\circ}C$ and 52.5-84.$2^{\circ}C$, respectively. 8. The gelatinization patterns for 6% munbean crude starch and 8% buckwheat crude starch were investigated by Brabender amglograph. Mungbean crude starch showed the initial pasting temperature of 77.6$^{\circ}C$ without peak height, and buckwheat crude starch showed that of $62.5^{\circ}C$ without peak height. In addition, sensory evaluation for sample starch gels (mungbean, buckwheat, cowpea) was done. 1. The difference of sensory characteristics for each starch gel was significant. 2. The sample starch gels were regarded as 'Mook' by pannels. 3. 74.44% of the degree of Mooklike was explained by hardness.
Journal of the Korean Society of Food Science and Nutrition
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v.41
no.7
/
pp.927-935
/
2012
This study was performed to develop functional vinegar by using cucumbers through two stages of fermentation. The alcohol content was maximized (7.8%) after 6-days of alcohol fermentation at $25^{\circ}C$ by adjusting the initial sugar concentration to $15^{\circ}Brix$, and vinegar with an acidity of 5.8% was obtained after 12-days of acetic acid fermentation at $30^{\circ}C$. The major sugars in the produced vinegar were glucose and fructose, which were present in concentrations of 3,067.26 and 395.73 mg%, respectively. The major organic acids were acetic acid and succinic acid, which were present in concentrations of 4,410.5 and 841.11 mg%, respectively. The total free amino acid content of the cucumber vinegar was 181.45 ${\mu}g/mL$ and citrulline, valine, aspartic acid, asparagine, and ornithine were the major amino acids. The inorganic components included various alkaline elements, such as K, Ca, and Mg. In addition, experimental methods to assess the DPPH and $ABTS^+$ radical-scavenging ability, reducing power, and ${\beta}$-carotene bleaching activity showed that the cucumber vinegar had strong antioxidant properties. The total polyphenol content, which are the major components responsible for the antioxidant activities of the cucumber vinegar, was 40.14 mg/100 mL. The cucumber vinegar showed significantly higher hepatic aldehyde dehydrogenase activity when compared to the alcoholic control (negative) and the marketing drink (positive), resulting in decreased plasma acetaldehyde concentrations in rats. These results demonstrate that cucumber vinegar possesses antioxidant properties and holds great promise for use in preventing hangovers.
Journal of the Korean Society of Food Science and Nutrition
/
v.35
no.3
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pp.335-343
/
2006
This study was undertaken to investigate the effects of meal pattern on lipogenesis and activities of lipogenic enzyme in rats epididymal and mesenteric adipose tissues. A high fat diet was fed either ad libitum or in 1 meal during the last 3 h of the dark cycle for 4 weeks. Lipogenesis was measured as glucose conversion to total lipid and activities of glucose-6-phosphate dehydrogenase (G6PDH), 6-phophogluconate dehydrogenase (6PGDH) and NADP-malate dehydrogenase (ME) were determined by measuring NADPH production. Lipoprotein lipase (LPL) activity and serum lipoprotein concentrations were also measured. Meal-fed (3 h) rats had a decreased food intake, body weight and carcass fat compared with rats fed ad libitum. The serum triglyceride concentration of meal-fed rats tended to be higher than that of the ad libitum rats. However, there were no differences between meal-fed group and ad libitum group in serum concentrations of HDL-cholesterol, LDL-cholesterol and total-cholesterol. Rates of lipogenesis in both epididymal and mesenteric adipose tissues were significantly higher in the meal-fed group than that in the ad libitum group. In addition, meal-fed group showed higher G6PDH, 6PGDH and LPL activities in both epididymal and mesenteric adipose tissues, but exerted no significant effect on ME activity. These results suggest that meal-fed rats compared with ad libitum rats have marked lipogenic capacity, although such elevation probably does not result in increase in carcass fat concentration. Thus, meal-fed diet can be an important determinant of the alterations in adipose lipid metabolism.
In Exp. 1, a total of forty eight multiparous sows were used in a 21-d performance assay. All litters were standardized at eleven piglets within 24h of parturition. Sows were fed one of the four experimental diets 1) CON(basal diet; Control), 2) MP1(basal diet added 0.05% of medicinal plant mixtures), 3) MP2 (basal diet added 0.1% of medicinal plant mixtures) and 4) MP3(basal diet added 0.2% of medicinal plant mixtures). Backfat thickness difference from farrowing to weaning was tended to increase in CON treatment compared to those of medicinal plants mixture(MP) treatments. However, there were not significant differences among the treatments(P>0.05). Sow’s ADFI was increased in sows fed MP2 treatment compared to MP3 treatment(P<0.05). Piglet weight gain was tended to increase in MP1 treatment compared to CON treatment(P<0.05). The glucose concentration of MP3 treatment was higher that of CON treatment(P<0.05). Exp. 2, a total of one hundred twenty weaning pigs ($L{\time}Y{\time}D$, 4.70$\pm$0.63kg average initial body weight) were used in a 20-d performance assay. Weanling pigs were fed treatments diets included 1) CON(basal diet; Control), 2) MP0.05(basal diet added 0.05% of medicinal plant mixtures), 3) MP0.1(basal diet added 0.1% of medicinal plant mixtures) and 4) MP0.15(basal diet added 0.15% of medicinal plant mixtures). Through entire experimental period, as MP increased in the diets, there was an increase in ADG(linear, P<0.067), improvement gain/feed(linear, P<0.018) and a decrease in ADFI (linear, P<0.008). DM digestibility was significantly increased with addition of MP(linear, P<0.004; quadratic, P<0.030). In conclusion, sows fed MP2 had showed less body weight loss and increased weight gain for suckling piglet. In weaning pigs, as supplementation MP from 0.05 to 0.1% in diet had improved growth performance and DM digestibility.
Burkholderia sp. D5, a polyaromatic hydrocarbons(PAHs)-degrading bacterium, was isolated from oil-contaminated soil. The bacterium could utilize phenanthrene (Phe) as a sole carbon source but could not use pyrene (Pyr). However, the strain could degrade Pyr when a cosubstrate such as yeast extract (YE) was supplemented. The PAH degradation rate of the bacterium was enhanced by the addition of other organic materials such as YE, peptone and glucose. YE was a particularly effective additive in stimulating cell growth as well as PAH degradation. When 1 g-YE/L was supplemented into the basal salt medium (BSM) with 215 mg-Phe/L, the specific growth rate (0.28 h-1) and Phe-degrading rate (29.30 μmol/L/h) were enhanced approximately ten and two times more than those obtained in the BSM with 215 mg-Phe/L, respectively. Through kinetic analysis, the maximum specific growth rate (μmax) and PAH degrading rate (Vmax) for Phe were obtained as 0.34/h and 289 ${\mu}mol$/L/h, respectively. Also, μmax and Vmax for Pyr were 0.27 h-1 and 50 ${\mu}mol$/L/h, respectively. The degradation rates for each Phe (2.20 μmol/L/h) and Pyr (2.18 μmol/L/h) were lower in mixture substrates than in a single substrate (29.30 ${\mu}mol$/L/h and 9.58 ${\mu}mol$/L/h, respectively). Burkholderia sp. D5 can degrade Phe and Pyr contained in soil, and the PAH degradation rates in soil were 20.03 ${\mu}mol$/L/h for Phe and 1.09 ${\mu}mol$/L/h for Pyr.
Ixeris dentata var. albiflora Nakai, a herbal plant, is often used to make a strong stomach as an antiphlogistic used when dyspepsia and to improve appetite in Korea and China. And also it is used for adult diseases such as diabetes and liver diseases as Korean traditional medicine. In this study, the composition and DPPH radical scavenging activities of the root of Ixeris dentata var. albiflora Nakai and its effects on cell viability on vero and chang cells were investigated. Moisture, crude ash, crude protein and crude lipid were 79.14, 2.49, 8.28 and 2.56 g/100 g respectively. The highest mineral content was K. The major free sugars were glucose, fructose and sucrose. Major fatty acid are linoleic acid, palmic acid and linolenic acid. Major amino acids were glutamic acid, arginine and aspartic acid and the total contents of amino acids were 28.12 mg/g. The methanol extracts were further fractionated with n-hexane, chloroform, ethylacetate, butanol and water to get an active fraction. In addition, cell viabilities in each fraction were determined. Methanol extract, butanol, and aqueous fraction showed strong survival rates in vero cell and chang cell viability test, and hexane, chloroform, and ethylacetate fraction were examined for toxin in a cell. The root of Ixeris dentata var. albiflora Nakai had scavenging activities against DPPH radicals in a dose-dependent assay. Ethylacetate fraction's SC50 was $6.8\{\mu}g/mL$, very strong DPPH radical scavenging activities, but water fraction did not show any activity.
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