• Title, Summary, Keyword: Calcium salts

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Growth Inhibitory Effects of Chloride Salts and Organic Acid Salts Against Food-Borne Microorganisms (Chloride염 및 유기산 칼슘염의 식중독 미생물에 대한 증식 억제 효과)

  • 이나영;김용석;신동화
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.32 no.8
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    • pp.1233-1238
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    • 2003
  • The growth inhibitory effects of chloride salts and organic acid salts against six food-borne microorganisms (Bacillus cereus ATCC 11778, Escherichia coli O157:H7 ATCC 43894, Listeria monocytogenes ATCC 19111, Salmonella Typhimurium ATCC 14028, Staphylococcus aureus ATCC 25923, Vibrio parahaemolyticus ATCC 17802) were determined using Bioscreen C in broth medium. The growth inhibitory concentrations of sodium chloride and potassium chloride on B. cereus were 7 and 9%, respectively. E. coli O157:H7 and S. aureus were inhibited by treatment of 3% calcium chloride. Magnesium chloride showed growth inhibitory effect on B. cereus, S. Typhimurium, and S. aureus at 5%. The order of growth inhibition effects by organic acid salts was calcium propionate>calcium acetate>calcium lactate. Calcium chloride (3%) with 0.01% lactic acid showed strong inhibition on the growth of S. Typhimurium and exhibited stronger growth inhibition than calcium chloride alone (5%). We concluded that calcium chloride and calcium propionate had strong growth inhibitory activities and that calcium chloride and sodium chloride in combination with lactic acid had stronger inhibitory activities than that of chloride salts alone.

Effects of Salts on the Formation of $\alpha$-Calcium Sulfate Hemihydrated from by-Product Gypsum of Phosphoric Acid Process at Hydrothermal Condition (가압수열 수용액중에서 인산석고로부터 $\alpha$형 반수석고의 생성에 미치는 염류의 영향)

  • 이구종;최상흘
    • Journal of the Korean Ceramic Society
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    • v.24 no.4
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    • pp.343-348
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    • 1987
  • The effects of salts such as aluminum sulfate as inorganic salt(2-4%), and sodium salts of citrate, tartrate, succinate, potassium tartrate and gelatin as organic salts(0.1%) on the formation of ${\alpha}$-calcium sulfate hemihydrate from by-product gypsum of phosphoric acid process under hydrothermal condition at 123$^{\circ}C$ and 133$^{\circ}C$ were investigated. Aluminum sulfate solution exhibited the catalystic effected on the crystallization of ${\alpha}$-calcium sulfate hemihydrate of which was assumed in the prismatic form, and organic salts solution exhibited little effect on the catalystic action to the crystallization, than inorganic salts. In the acidic solution with sulfuric acid(pH=2), needle like crystal of calcium sulfate hemihydrate was obtained. Hydrothermal process with aluminum sulfate solution also showed certain amounts of impurity removal such as phosphorus penataoxide from calcium sulfate hemihydrate.

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Effect of Salts on the Formation of $\alpha$-Calcium Sulfate Hemihydrate from by-Product Gypsum of Phosphoric Acid Process under Water Vapor at Atmospheric Pressure (상압 수증기중에서 인산 석고로부터 $\alpha$형 반수석고의 생성에 미치는 염류의 영향)

  • 이구종;최상흘
    • Journal of the Korean Ceramic Society
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    • v.25 no.3
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    • pp.300-306
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    • 1988
  • The catalytic effect of salts on formation of ${\alpha}$-calcium sulfate hemihydrate under water vapor at atmospheric pressure was studied and the formation of q-calcium sulfate hemilydrate from by-product gypsum of phosphoric acid process was investigated. The order of catalytic effect of salts are as follow: Ammonium chloride>Sodium succinate>Calcium chloride>Sodium tartrate>Magnesium chloride The prismatic crystals was formed when ammonium chloride, calcium chloride and magnesium chloride was added, whereas the needle crystals was formed when sodium tartrate was added. Ammonium chlorideis most successful in catalytic effects in formation of ${\alpha}$-calcium sulfate hermihydrate for the by-product gypsum of phosphoric acid process.

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Studies on Silk Contraction Treated with Neutral Salts (중성염에 의한 견사의 수축작용)

  • Lee, Gwang-Gil;Lee, Yong-U;Nam, Jung-Hui
    • Journal of Sericultural and Entomological Science
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    • v.39 no.1
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    • pp.44-55
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    • 1997
  • This study was carried out to find out the relationship between qualities and contraction phenomenon of silk fibers by treatment of concentrated neutral salts. The contraction effects of silk fibers showed the critical point on the treatment conditions of concentration, temperature and time, among three kinds of neutral salts such as calcium nitrate, calcium chloride and lithium bromide. But, The silk fibers, pretreated with bromide and/or formaldehyde, did not show the contraction upon treating with calcium nitrate. This indicates that tyrosine and serine can be correlated with the contraction reaction because of coupling these amino acids with bromide and formaldehyde. In conclusion, a mechanism for the contraction of silk fiber with highly concentrated calcium nitrate solution is supposed as follows. At the initial stage of ration, the water was penetrated into the amorphous regions and fibers swollen, therefore, the contraction took place mainly in amorphous regions, which have plenty of functional groups with hydroxyl residues. Then, as the calcium nitrate is penetrated into the microfibril, the gydrogen bonds of tyrosine and serine residues and broken and crystalline regions are more and more influenced by increasing concentration of calcium nitrate solution. Microgibrils of crystalline regions become entangled, contracted to linear direction and rearranged to form new stable hydrogen bonds.

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Buffering Effects of Calcium Salts in Kimchi: Lowering Acidity, Elevating Lactic Acid Bacterial Population and Dextransucrase Activity

  • Seo, Eun-Chae;Moon, Jin-Seok;Jung, Jee-Yun;Kim, Ji-Sun;Eom, Hyun-Ju;Kim, So-Young;Yoon, Hyang-Sik;Han, Nam-Soo
    • Journal of Microbiology and Biotechnology
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    • v.19 no.12
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    • pp.1644-1649
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    • 2009
  • This study investigates the buffering effects of calcium salts in kimchi on the total acidity, microbial population, and dextransucrase activity. Calcium chloride or calcium carbonate was added to dongchimi-kimchi, a watery radish kimchi, and the effects on various biochemical attributes were analyzed. The addition of 0.1% calcium chloride produced a milder decrease in the pH after 24 days of incubation, which allowed the lactic acid bacteria to survive longer than in the control. In particular, the heterofermentative Leuconostoc genus population was 10-fold higher than that in the control. When sucrose and maltose were also added along with the calcium salts, the dextransucrase activity in the kimchi was elevated and a higher concentration of isomaltooligosaccharides was synthesized when compared with the control. Calcium chloride was determined as a better activator compound of dextransucrase than calcium carbonate, probably because of its higher solubility. Therefore, the results of this study confirm the ability of the proposed approach to modulate the kimchi fermentation process and possibly enhance the quality of kimchi based on the addition of dietary calcium salts.

Isolation of Calcite Forming Bacteria and Soil Bio-consolidation with Various Calcium Salts (탄산칼슘 생성 균주의 분리 및 다양한 칼슘원에 따른 토양 고결화)

  • Gu, Takyong;Kang, Chang-Ho;Shin, Yujin;So, Jae-Seong
    • KSBB Journal
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    • v.32 no.3
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    • pp.206-211
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    • 2017
  • The physical method used to prevent a landslide has the risk of environmental pollution. Calcite forming bacteria (CFB) have been received increasing attention as a novel and environmental friendly strategy for the soil improvement. In this study, we selected 11 CFB strains with high calcite production. We also examined survivability and calcite productivity of the strains under various stress conditions to select strains with high resistance to various stresses. Two strains was selected by environment stress. Sphingobacterium sp. KJ-32 and Viridibacillus arenosi B-25 precipitate calcite more than other strains at pH 5 and $15^{\circ}C$ respectively. Bio-consolidated soil cakes were made using various calcium salts (calcium chloride, calcium acetate, calcium lactate, calcium gluconate) with mixed culture of 2 strains. Among them, the calcite made using calcium chloride was the largest. These observations demonstrate that this bio-consolidation technology has the potential for eco-friendly prevention of landslide and soil improvement.

The Effect of Various Types of Calcium Sources on Calcium and Bone Metabolism in Rats (칼슘 급원의 종류가 흰쥐의 체내 칼슘 및 골격대사에 미치는 영향)

  • 정혜경
    • Journal of Nutrition and Health
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    • v.29 no.5
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    • pp.480-488
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    • 1996
  • This study was performed to investigate the effect of various types of calcium sources on calcium and bone metabolism. Sprague-Dawley male rats weighing approximately 89.3g were divided into 4 groups and fed experimental diets containing 0.5% calcium for 5 weeks. Four different calcium salts were used for the study : calcium phosphate, calcium lactate, calcium gluconate, and calcium carbonate. Food intake showed no significant difference n accordance with the type of calcium salt, but bo요 weight gain and food efficiency were lower in calcium gluconate and calcium carbonate groups. There was significant differences in liver, thymus and epididymal fat pad weight with the of calcium salt ; the calcium gluconate group showed lower values compared to the other groups. Femur and scapular length were higher in calcium lactate and calcium carbonate groups. Wet weight, dry weight, and density of the femur tended to be lower in the calcium gluconate group than the other groups, but this difference was not statistically significant. The calcium content of the other groups. The calcium gluconate group showed higher urinary calcium and lower calcium absorption and balance. In conclusion, calcium and bone metabolism were different according to the type of calcium sources consumed.

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Effects of Various Calcium Salt Spray on Calcium Accumulation into Apple Fruits (Malus domestica Borkh.) (칼슘급원별 수관살포가 사과 과실의 칼슘축적에 미치는 영향)

  • Choe, Jong-Seung
    • The Journal of Natural Sciences
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    • v.6 no.1
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    • pp.49-54
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    • 1993
  • This study was conducted to investigate the influence of various calcium salts on the accumulation of calcium in apple fruits when sprayed on whole tree. Differences in the total calcium contents of fruits were found between calcium sources and cultivars. In 'Tsugaru' , calcium nitrate, calcium chloride, and calcium carbonate were all effective but only calcium chloride and calcium carbonate appeared to be effective in 'Fuji' . Major parts of the applied calcium were accumulated in the feel and outer flesh. Ethylene evolution of fruit was retarded during storage with the increase of total calcium content in 'Fuji' fruit treated calcium acetate.

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Treatment of Hydrogen Fluoride Generated from the F-gases Decomposition Processes

  • Park, Jun-Hyeong;Choi, Chang Yong;Kim, Tae-Hun;Shin, InHwan;Son, Youn-Suk
    • Asian Journal of Atmospheric Environment
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    • v.10 no.4
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    • pp.190-196
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    • 2016
  • The objective of this study is to obtain the optimal conditions to remove hydrogen fluoride (HF) generated from a variety of F-gas treatment processes. First, we selected $Ca(OH)_2$ and $CaCO_3$ as a reactant among the various alkali salts which have a high removal efficiency and a competitive price by forming a calcium fluoride precipitate. Additionally, various factors were investigated to improve the removal efficiency of HF. The conditions such as the settling time, agitating time and intensity, reaction temperature, and pH were considered as main factors. As a result, in the treatment process to remove HF through Ca-based alkali salts, the optimal conditions were a 120 min settling time, 30 min of agitation at 100 rpm, a pH of 4-8, and a reaction temperature of $40^{\circ}C$.

Retention of sulfate and chloride ions in commercially available tubular membranes

  • Qadir, Danial;Mukhtar, Hilmi;Keong, Lau Kok
    • Membrane Water Treatment
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    • v.8 no.4
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    • pp.369-380
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    • 2017
  • Performance evaluation of four commercially available tubular membranes (AFC 80, AFC 30, PU 608, ES 404) was accomplished in self-assembled membrane testing unit. Effects of varying transmembrane pressure, feed concentration and anion type were investigated. Aqueous solutions of salts such as calcium chloride, calcium sulfate, tin chloride and tin sulfate were prepared for this study. It was noted that the investigated parameters e.g., pressure and concentration had significant effects on membrane's performance. Nevertheless, anion type effectively played its role in the rejection of salts since salt having SO4-2 anions had a better rejection than the salts containing Cl-1. It is observed that rejection was dominated by Donnon exclusion for strongly charged nanofiltration membranes whereas for weakly charged ultrafiltration membranes, size exclusion was the key mechanism to reject the ions.