• 농업과학연구
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• 제23권2호
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• pp.219-226
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• 1996

한국인의 기호에 맞으며 약리적인 효능을 가지고 있는 인삼을 인삼 extract, 백삼분 및 미삼분 형태로 요구르트 제조시에 첨가하여 요구르트의 산생성도, 유산균수, 제품의 점도, 관능검사 및 보존성 등을 시험한 결과는 다음과 같다. 1. 인삼 extract, 백삼분 및 미삼분을 첨가한 액상 요구르트의 시험제조 결과 산도에 있어서는 무첨가구의 0.76%에 비하여 첨가구 특히 미삼첨가구가 1.15%로서 가장 높았다. 2. 유산균수는 무첨가구의 $1.5{\times}10^8/m{\ell}$에 비하여 첨가구가 더 증식되었고 특히 미삼첨가구가 $4.3{\times}10^8/m{\ell}$로서 가장 높았다. 3. 제품의 점도에 있어서는 무첨가구에 비하여 인삼첨가구 특히 백삼첨가구가 높았다. 4. 액상요구르트의 관능검사 결과 무첨가구에 비하여 맛, 향취 및 전체적인 기호도에서 미삼이 가장 높았다. 5. 요구르트 제품의 $5^{\circ}C$, 10일간 보존시험에서 pH, 산도 및 유산균수는 큰 변화가 없었다.

• Asian-Australasian Journal of Animal Sciences
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• 제5권3호
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• pp.559-561
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• 1992

Three strains each of L. bulgaricus and S. thermophilus isolated from indigenous dahi were examined for their rate of acid production and corresponding pH values in skim milk medium incubated at $40^{\circ}C$. No significant increase in titrable acidity or decrease in pH were recorded from initial period up to 2nd hour in both the strains. Following this period, however, there was a continuous increase in titrable acidity and a decrease in pH value in the milk for all the tested strains. Further it was observed that there was a variation among these strains for their acid production rate. High rate of acid production was recorded for the L. bulgaricus as compared to S. thermophilus. The results further, suggested that efforts should be made to select a proper pair of L. bulgaricus and S. thermophilus according to their rate of acid production, at a particular temperature in order to produce a good quality product.

• 한국대기환경학회지
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• 제7권3호
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• pp.203-207
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• 1991

Scientists in the National Institute of Environmental Research had carried out air and precipitation sampling. According to the data analysed, the acidity (pH) measured was in the range of 3.7 $\sim$ 5.5. Detailed analysis indicated that observed acid rain was associated with westerlies generally coming out of the mainland of China and with a cyclone formed therein. Emission of air pollution from Korea and Japan also appeared to contribute in the observed high acidity in some cases. The one of chief reasons for the occurrence of acid rain in the west coast of Korea was due to the increase in the total emission of air pollution in China. In 1990, China was the world's top producer of coal amounting in 1.05 B tons with an annual increase of 10%, and the produced 100 M tons of crude oil. $SO_2$ emission from all energy usage in China was estimated at 25 $\sim$ 50 M ton per year.

• 한국식품영양과학회지
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• 제23권5호
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• pp.845-848
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• 1994

The fermenting conditions for acetic acid production with Acetobacter sp. FM-10 which could grow in the medium containing 10% ehtanol were investigated. Initial concentration of acetic acid in broth medium affected greatly to the fermentation speed. For example , the acetic acid production increased proportionally by the increasing of initial concentration was higher that 1.0%. When the cultivation was started with broth medium containing 5% ethanol, the additional adding ethanol during the fermentation was not significantly increased the acidity of the medium. The acidity of the medium containing 10% ethanol was reached to 8.3% after shaking than static cultivation by about 10 days with 150 rpm shaking speed. Acetic acid production with shaking cultivation was faster the static cultivation by abot 10 days under the same condition except shaking. In acetic acid fermentation with the batch style fermentor , the optimum fermentation condition was 700 rpm of agitation speed and 5L/min air flow rate in 3L culture medium .

• 자원환경지질
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• 제33권6호
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• pp.519-524
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• 2000

This study has been performed to evaluate the possibility of utilizing stone powder sludges from stone quarry and manufacturing plant as adsorbents for heavy metals in industrial wastewater. The stone powder sludges from stone quarry (IS-01) have the most effective adsorption capacity (above 95％ of initial concentrations) under the given experimental conditions of reaction times (Pb : 15 min, Cu : 2 hr, Zn : 48 hr), initial acidity of solution (pH>3) and dosage (sludge/liquid ratio : 0.02). The stone powder sludges from manufacturing plant (CW-01) show relatively high adsorption capacity (about 95％ of initial concentrations) only for Pb with a reaction times of 12 hours, initial acidity of solution (pH>3) and dosage (sludge/liquid ratio : 0.02). The stone powder sludges (IS-01) from stone quarry having relatively excellent adsorption capacity under the given experimental conditions show their potential utilization as heavy metal adsorbents.

• 한국식품영양학회지
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• 제9권3호
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• pp.265-270
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• 1996

When new told grape with high acidity Is used wine, their sensory scores are decreased. Using three available methods reducing excess acidify In winemaking, they were malo-lactic fermentation, addition of apple pomace and malo-alcohol fermentation. The chemical monponents and sensory evaluation of wine were determined. They were found in pink wine added apple pomace that tatal acidity and malic acid content were 0.76 and 0.484%. Color Intensity (A520+A420) in pink wanes, their valuse were in the range 8.21~9.42, while the value of red wine was 20.92. Browning index and total phenol contents in pink wine, their values were In the range of 1.36∼1.42 and 3,300∼3,800mg 11. The sensory evaluation showed that the pink wine added apple pomace(10%) was highest in taste and total scores (P<0.05), and the taste of wine has improved.

• 한국식품영양학회지
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• 제11권5호
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• pp.570-575
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• 1998

This paper presents an investigation of chemical and sensory properties of Kimchi with red-ripe persimmon. Kimchi with different levels(0, 5, 10, 15%) of real-ripe persimmon was fermented at 4$^{\circ}C$ for 20days. During the fermentation, pH decreased in all Kimchi samples and pH of Kimchi with red-ripe persimmon was a little lower than that of Kimchi without red-ripe persimmon. Acidity increaased continuously and saltiness was maintained at 1.2∼2.2% levels during fermentation. The reducing sugar of Kimchi with red-ripe persimmon was relatively higher than that of the other sample without red-ripe persimmon. Total vitamin C(Vit. C) in Kimchi added red-ripe persimmon increased in the early stage of fermentation and reduced gradually after 4days of fermentation. In the sensory evolution, Kimchi with 10% red-ripe persimmon recorded high scores in taste, flavor, texture and overall acceptability during all fermentation period.

• 대한화학회지
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• 제56권5호
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• pp.563-570
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• 2012

Solid acid Mo(VI)/$ZrO_2$ with 2-10% Mo(VI) was coated on honeycomb monoliths by impregnation method. These catalytic materials were characterized by BET, $NH_3$-TPD/n-butylamine back titration, PXRD and SEM techniques. Phenyl salicylate (Salol) was synthesized via transesterification of methyl salicylate and phenol over these catalytic materials. An excellent yield (91.0%) of salol was obtained under specific reaction conditions. The effect of poisoning of acid sites of the catalytic material by adsorbing different bases and its effect on total surface acidity, powder XRD phases and catalytic activity was studied. A triangular correlation between the surface acidity, powder XRD phases and catalytic activity of Mo(VI)/$ZrO_2$ was observed. The thermally regenerated catalytic material was reused repeatedly with a consistent high yield of salol.

• 한국대기환경학회지
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• 제11권1호
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• pp.77-84
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• 1995

To prevent or reduce air pollutant from methanol fueled vehicles, methanol oxidation reaction was carried out using a heteropoly acid catalysts. Catalytic activities of catalysts have been experimented at atmospheric pressure in a fixed bed flow reactor. Catalysts were characterized by XRD, IR, thermal analysis, N $H_{3}$-TPD and GC pulse technique. Acidities of catalysts were highly affected by poly-atoms. Methanol conversion was much higher on catalyst with W than on catalyst with Mo as a poly-atoms. With the increase of copper content(X) in C $u_{x}$ $H_{{3-2x}}$PMo catalyst, acidity was decreased and oxidation ability was increased. Methanol conversion and product distribution were affected by the acidity and oxidation ability of catalyst. Especially, supported PdSiW(1wt%) catalyst has a very good methanol conversion and C $O_{2}$ selectivity as high as a commertial 3-way catalyst.t.

• 한국대기환경학회지
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• 제16권2호
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• pp.113-120
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• 2000

Effects of sea-salts on the properties of aerosol collected in a coastal region were studied by applying a gas-particle equilibrium model SCAPE to the measurement data from Korea Cheju Island in summer 1994. It was found that the observed higher ammonium concentrations in fine particles (PM2.5) than in TSP were caused by forced evaporation of ammonium in coarse fraction of aerosol by sea-salts and the degree of evaporation was quantified through an application of SCAPE. By subtracting the sea-salt fraction from the measured concentra-tions the changes of aerosol property were also studied. The concentrations of nitrate at both TSP and PM2.5 decreased when alkaline sea-salt fraction was removed from the measured data. Estimates of aerosol acidity increased for most samples with sea salt loadings, However in some cases with high mass fractions of sea-salt components the aerosol acidity of PM2.5 decreased slightly. This is though to be related with the formation of solid salt with the removal of sea-salts.