• 한국수산과학회지
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• 제21권4호
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• pp.269-275
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• 1988

연제품의 보존제로서 lysozyme의 효과를 검토하기 위하여, 부패된 연제품에서 7종의 대표 균주를 분리 선정하여 lysozyme에 의한 발육조지 효과와 hexametaphosphate와 pyrophosphate을 병용 첨가하였을 때의 발육조지 효과를 측정하고 각 균에 대한 항균제의 발육조지 농도를 측정한 후 가장 효과적인 농도를 게맛살, 어묵과 튀김어묵에 첨가 또는 침지하여 $30^{\circ}C$에 7일간 저장하면서 생균수, pH 및 VBN을 검사한 결과는 다음과 같다. 1. 분리 세균 7종 중 6종의 균은 lysozyme에 의하열 발육이 억제되었으며, sodium hexametaphosphate와 sodium pyrophosphate를 병용 첨가하였을 때 그 발육조지 효과가 상승하였다. 발육조지 효과는 lysozyme + sodium hexametaphosphate + sodium pyrophosphate, lysozyme + sodium pyrophosphate, lysozyme + sodium hexametaphosphate, lysozyme의 순으로 높았으며 저항력이 제일 강하였던 1균주도 lysozyme$(0.05\%)$ + sodium pyrophosphate$(0.5\%)$ + sodium hexametaphosphate$(0.1\%)$를 첨가하였을 때 발육조지 효과가 비교적 좋았다.2. 게맛갈과 어묵은 lysozyme$(0.05\%)$ 단독 첨가보다 sodium pyrophosphate$(0.5)\%$와 sodium hexametaphosphate$(0.1\%)$를 병용 첨가하였을 때 세균발육 억제효과가 상승하였으나 직접 균의 배양 시험에서 보다 효과가 적었다. 튀김어묵을 lysozyme$(0.05\%)$ 단독 그리고, lysozyme$(0.05\%)$ + sodium pyrophosphate $(0.5\%)$ + sodium hexametaphosphate$(0.1\%)$ 용액에 5분간 침지 처리하였을 때 약간의 방부효과는 인정되었으나 sorbic acid$(0.2\%)$을 첨가한 것보다 효과가 적었다.

• 한국식품영양과학회지
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• 제22권6호
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• pp.758-762
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• 1993

Sodium hexametaphosphate(SHMP)가 탈지대두박 단백질의 추출과 농축단백질의 색도 및 아미노산 조성에 미치는 영향을 검토하였다. SHMP에 의한 단백질의 추출은 1.5% SHMP에서 가장 높았으며 이 이상의 농도에서는 오히려 감소하는 결과를 나타내었다. 또한 참깨박 단백질의 추출은 pH 5.0에서 17.0%, pH 2.0에서는 22.7%로 아주 낮았으나 pH 12.0에서 60.7%의 단백질이 추출되었다. 시료와 용매와의 비율에 있어서는 1 : 40에서 약 60%의 단백질이 추출되었으며 비율이 증가할수록 추출율이 증가하는 경향을 나타내었고 SHMP처리로 인해 농축단백질의 색도가 개선되었다. 참깨빡 농축단백질의 아미노산 조성을 비교한 결과 SHMP의 처리에 의해 lysine과 hethionine의 함량이 현저히 감소된 반면 valine과 leucine함량은 증가된 결과를 나타내었다.

• 한국세라믹학회지
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• 제39권8호
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• pp.775-782
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• 2002

세라믹 분말을 이용하여 슬러리와 분산제의 농도에 따른 조대입자 함량평가에 대한 연구를 수행하였다. 시판용의 알루미나 분말을 조대입자 분리용 시료로 사용하였으며, 분산제로는 sodium hexametaphosphate와 sodium polyacrylate를 사용하였다. 알루미나 농도의 증가 및 분산제 농도의 감소에 따라 조대입자의 함량이 증가하였다. 슬러리 내의 시료농도가 1.0wt%이고, 시료에 대해 1.0wt%의 분산제를 첨가하였을 때 조대입자의 함량이 가장 작게 측정됨을 알 수 있었다. 고분자 분산제인 sodium polyacrylate를 사용하여 sodium hexametaphosphate보다 조대입자의 함량이 크게 측정되었다. 실험횟수가 증가함에 따라, 체의 질량이 일정한 비율로 감소하는 경향을 나타냈다. 조대입자의 함량을 알고 있는 임의의 슬러리를 제조하여 실험을 실시한 결과, 본 연구에서 사용한 습식 체분리 방법은 조대입자 함량평가에 적합한 것으로 사료된다.

• 한국토양비료학회지
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• 제13권2호
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• pp.65-70
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• 1980

우리나라 토양(土壤)의 입도분석(粒度分析)에 적합(適合)한 분산제(分散劑)를 선정(選定)하기 위하여 대표토양(代表土壤) 18점(点)에 대(對)한 표토(表土) 및 심토(深土)의 입도분석(粒度分析) 결과(結果)는 다음과 같다. 1. 토양입자(土壤粒子)가 작을수록 분산제별(分散劑別) 분산능력(分散能力)의 차이(差異)가 커지는 경향(傾向)으로 점토입자(粘土粒子)(<0.002mm)의 분석치(分析値)에 있어서 분산제(分散劑)에 따라 차이(差異)가 컸었다. 2. 분산율(分散率)은 Sodium Pyrophosphate가 가장 높고 다음으로 Sodium Hexametaphophate, Ammonium Hydroxide, Sodium Hydroxide, Sodium Oxalate 순(順)이었다. 3. Sodium Hexametaphosphate는 Volcanic Ash Soil만을 제외(除外)하고 우리나라 모두 토양(土壤)의 입도분석(粒度分析)에 있어서 분산제(分散劑)로써 사용(使用)할 수 있을 것으로 본다. 4. Volcanic Ash Soil의 분산율(分散率)은 분산제(分散劑)를 사용(使用)하지 않은 경우보다 오히려 감소(減少)되는 경향(傾向)이 있으므로 이의 분산방법(分散方法)의 선정(選定)에는 특별(特別)한 주의(注意)가 요망(要望)된다.

• Corrosion Science and Technology
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• 제20권3호
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• pp.129-142
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• 2021

Effects of corrosion inhibitors (i.e., sodium nitrite, sodium hexametaphosphate, trimethylamine (TEA), sugar, and urea) on the corrosion resistance of carbon steel in CaCl₂ solution were investigated. The test solution was designed with response surface methodology of design of experiments (DOE) in the range of 0 ~ 50 ppm for NaNO₂, 0 ~ 200 ppm for (NaPO₃)₆, 0 ~ 2000 ppm for TEA, 0 ~ 3000 ppm for sugar, 0 ~ 200 ppm for urea with 3 wt% CaCl₂. The corrosion potential and the corrosion rate were measured with potentiodynamic polarization tests and analyzed statistically to find main effects of inhibitor concentrations and interactions between them. As a result, hexametaphosphate was the most effective compound in reducing the corrosion rate. Sugar also reduced the corrosion rate significantly possibly because it covered the surface effectively with a high molecular weight. The inhibiting action of sugar was found to be enhanced by adding trimethylamine into the solution. Nevertheless, trimethylamine did not appear to be effective in inhibiting corrosion by itself. However, urea and sodium nitrite showed almost no inhibition on corrosion resistance of steel.

• 약학회지
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• 제21권1호
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• pp.1-16
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• 1977

The effect of condensates of phosphates on the preservative activity of the food additives, using eight micro-organisms, has been studied by the agar dilution method. It was found that condensates of phosphates increased the food preserving action of almost all of preservatives and they acted as a synergist for the action of almost all of preservatives. Disodium dihydrogen prrophosphate acted as the strongest synergist in the experiment. But sodium tripolyphosphate anhydrous, sodium poly-phosphate, sodium tripolyphosphate and sodium hexametaphosphate acted as a inhibitor for action of some preservatives on some orgnisms. The preservatives were sodium dehydroacetate (DHA), potassium sorbate and NaNO$_{2}$ etc. The action of sodium meta-phosphate on the preservatives produced a mean difference by their origins. It was supposed that such a difference was produced by the difference of amount of impurities that were contained in sodium metaphosphate, It was also supposed that the does of the preservatives could be reduced by addition of condensates of phosphates, acting as a synergist for the action of almost all of the preservatives.

• 한국식품영양과학회지
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• 제24권1호
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• pp.133-140
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• 1995

This investigation was undertaken for the purpose of studying the changes of pectic substances in alcohol insoluble solids(AIS) extracted from cucumbers pickled in salt. The preparation methods were brining the cucumbers in 10% NaCl solution (bolied, method A), 20% NaCl solution(bolied, method B) and 20% NaCl solution(cool to $25^{\circ}C$ after boiling, method C). The composition ratio of hot water soluble pectin(HWSP) in AIS decreased during brining, while that of 0.4% sodium hexametaphosphate soluble pectin(NaSP) increased remarkably. The contents of Ca and Mg in AIS increased regardless of preparation methods used. By DEAE-cellulose chromatography, HWSP from fresh and brined cucumbers were divided into six fracitons. 0.2M peak was the main fraction in fresh cucumber, whereas 0.05M and 0.2M peak were the main fraction in pickled cucumbers. On the other hands, NaSP from fresh and brined cucumbers were divided into five fractions and 0.4M peak was the main fraction. However, the composition ratios of galacturonic acid and neutral sugar of 0.4M fraction in brined cucumbers were higher than those of fresh cucumber.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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• pp.337-341
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• 2001

A new method to extract gold from pyrite roster cinder, which combines ultra-fine-grinding with resin-in-pulp, has been studied in this paper. Compared with traditional leaching technology, it can short leaching time, avoid complex filter process, lower sodium cyanide consumption and increase gold recovery by 35%. During leaching, aluminium oxide ball was used as stirred medium, hydrogen peroxide as leaching aid and sodium hexametaphosphate as grinding aid. With the high efficiency and chemistry effect of ultra-fine-grinding, the leaching process was developed and the gold leaching rate may reach 88%. With AM-2 Б resin as abosorber and sulfocarbamide (TU) as eluent, gold was recovered from cyanide pulp by resin-in-pulp. AM-2 Б resin has good adsorbability in cyanide solution(pH=10). It was easy to elude gold from the loaded resin with 0.1㏖/L cholhydric acid and 1㏖/L sulfocabamide. The effect of contact time, temperature and acidity etc. on the gold absorption had been examined with static methods. The results showed that the adsorption and desorption of gold could both reach over 98%. The effects of flow rate of solution on dynamic adsorption and elution of gold had been examined with dynamic methods. Breakthrough curve and elution curve had been drawn in this paper. A mild condition was determined through a number of experiments: leaching time 2 hours, liquid solid ratio 4:1, sodium cyanide 3kg/t, hydrogen peroxide 0.05%, sodium hexametaphosphate 0.05%; adsorption time 30 minutes, temperature 10-3$0^{\circ}C$, resin($m\ell$) solid(g) ratio 1:10, eluent resin ratio 10-20:1, velocity of eluent $1.5m\ell$/min. Under the mild condition, the gold recovery may reach 85%.

• 대한화학회지
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• 제7권4호
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• pp.251-253
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• 1963

Six corrosion inhibitors for cooling water use were evaluated by means of a corrosometer in a laboratory bench scale test. A steel probe (Alloy 1020) was exposed and checked for the extent of corrosion in a recirculating water system, changing inhibitors and their concentrations at $40^{\circ}C$. A 95% inhibition was provided at the following concentrations of inhibitors. 50 ppm sodium hexametaphosphate 50 ppm commercial inhibitor A 50 ppm commercial inhibitor B 100 ppm disodium phosphate 200 ppm sodium chromate Sodium silicate was found to be use-less in this test. It was also observed that some inhibitors worked less effectively on the acid-cleaned steel probe.

• 한국식품과학회지
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• 제9권1호
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• pp.47-60
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• 1977

85% 나트륨 tripolyphosphate와 15% 나트륨 hexametaphosphate로 조성된 $7{\sim}10%$ 인산수용액을 미리 조리하기 전에 어체의 무게가 약 $4{\sim}10%$ 증가될 때까지 다량어육질에 주입하였다. 이실험은 $45{\sim}68kg$과 $7.3{\sim}0.5kg$ 크기의 황다랭이(Thunnus albacares)와 $4.5{\sim}5.0kg$ 크기의 가다랭이(Euthynnus pelamis)를 이용하여 산업규모의 다랑어 가공공장에서 처리하였는데 이 실험(實驗)에서 나타나는 인산염처리(燐酸鹽處理) 결과는 다음과 같았다. 1. 큰 황다랭이는 수율이 약 $5{\sim}8%$ 증가하였고 다소 수분함량이 높았다. 2. 조그만 황다랭이는 수율이 약 $3{\sim}8%$ 증가하였다. 3. 가다랭이는 수율이 $1{\sim}4%$ 증가하였다. 4. 생산품의 색과 맛은 극히 조금 좋아졌다.