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RISS 인기검색어
- 검색키워드
- 저자 : Yudianti, Rike (검색결과 5 건)
- 무료
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DSC Analysis on Water State of Salvia Hydrogels
Yudianti, Rike,Karina, Myrtha,Sakamoto, Masahiro,Azuma, Jun-Ichi The Polymer Society of Korea 2009 Macromolecular Research Vol.17 No.12
The role of the water structure present in hydrogels from nutlets of three species of salvias, S. miltiorrhiza (SM), S. sclarea (SS) and S. viridis (SV), was analyzed by differential scanning calorimetry (DSC). The sharp endothermic peaks that appeared at $5.9^{\circ}C$ (SM), $2.8^{\circ}C$ DC (SS) and $1.8^{\circ}C$ (SV) in each 1.0% hydrogel of 10.4-15.8% were not affected by addition of 0.1 M urea and alkali-metal salts. The order-disorder portions in the network were slightly affected by the distribution of freezable and non-freezable water in the hydrogel networks. The SV hydrogel was further used to investigate the effects of additives (0.1-8.0 M urea and 0.1-5.0 M NaCl) on its melting behavior. At 0.5-4.0 M urea and 1.0-3.0 M NaCl, two endothermic peaks appeared, corresponding to unbound (high temperature) and bound (low temperature) water in the gel networks, and eventually merged into one endothermic peak at 5.0-8.0 M urea and 4.0-4.5 M NaCl. After this merger, the endothermic peak shifted to 3.7, 4.0 and $5.6^{\circ}C$ at 5.0, 6.0 and 8.0 M urea, respectively. In the case of NaCl, a combination of peaks that occurred at 4.0-4.5 M were accompanied by a shift to lower temperature (-14.4 and $15.3^{\circ}C$) and the endothermic peak finally disappeared at 5.0 M NaCl due to the strong binding of water in the gel networks.
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Effects of Salts on Rheological Behaviour of Salvia Hydrogels
Yudianti, Rike,Karina, Myrtha,Sakamoto, Masahiro,Azuma, Jun-ichi The Polymer Society of Korea 2009 Macromolecular Research Vol.17 No.5
Rheological behavior of natural hydrogel produced from seeds of three Salvia spp. (S. miltiorrhiza (SM), S. sclarea (SS), S. viridis (SV)) was investigated by using a Rheometer equipped with a cone and plate geometry measuring system under never-dried condition. Different chemical contents of such hydrogels give significant effects on their rheological properties. Because of incomplete penetration of water inside the hydrogels after drying before-dried hydrogels were used for rheological analysis. To know molecular interactions which predominated in the gel formation, some constituents were externally added to the 1.0% (w/w) hydrogel. Addition of urea to disrupt hydrogen bonds reduced 3.4-67% viscosity of the untreated hydrogels and changed viscoelastic properties from gel to liquid-like behavior. Neutral salts added to the hydrogel solution at 0.1 M also lowered the viscosity in a manner related with increase in size of cations and temperature. Changing from gel state to liquid-like state was also easily confirmed by oscillation measurement (storage, G', and loss, G", modulii) typically observed in the cases of potassium sulfate and potassium thiocyanate. Influence of pH variation on the viscosity explained that weak alkaline condition (pH 8-9) creates a higher resistance to flow due to increasingly electrostatic repulsions between negative charges ($COO^-$) Importance of calcium bridges was also demonstrated by recovery of viscosity of the hydrogels by addition of calcium after acidification. The summarized results indicate that electrostatic repulsion is a major contributor for production of hydrogel structure.
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( Yudianti Pangestu ),( Ari Fahrial Syam ),( Ahmad Fauzi ),( Murdani Abdullah ),( Dadang Makmun ),( Marcellus Simadibrata ),( Chudahman Manan ),( Aziz Rani ),( H Daldiyono ) 대한소화기학회 2007 SIDDS Vol.9 No.-
Background/Aims: Obstructive jaundice may be caused by extrahepatic cholestatic (CBD stones, pancreas and ampula cancer, CBD stricture, cholangiocarcinoma) and intra hepatic cholestatic. The aim of this study was to know what was the cause of obstructive jaundice based on ERCP evaluation. Methods: We did the retrospective study based on data of ERCP in Cipto Mangunkusumo Hospital in October 2004 until Mei 2007 Results: We evaluated 95 patients which has be done ERCP examination. We got complete data in 76 patients. Male was more frequent than female (61.8% vs 38.2%), with age range was 20-80 years old (age mean was 48.47 years old). We found CBD stones in 33 (43.4%) patients, papilla vateri tumour in 10 (13.2%) patients, head of pancreatic cancer in 8 (10.5%) patients, CBD stricture in 3 (3.9%) patients, cholangiocarcinoma in 1 (1.3%) patient, Klatskin tumour in 1 (1.3%) patient and unknown etiology obstructive in 4 (5.3%) patients. Obstructive jaundice was the most indication in ERCP examination, in 47 (61.8%) patients, followed by cholelithiasis in 22 (28.9%) patients. Sphincterotomy and stones extraction has be done in 17 (22.4%) patients, ductal cleansing in 3 (3.9%) patients, CBD stenting was performed in 17 (22.4%) pasien. We sent to surgery in 13 (17.1%) patients. ERCP failed was reported in 15 (19.7%) patients, most in the of pancreatic cancer patients. Conclusions: We found CBD stones was the most cause of obstructive jaundice, based on ERCP evaluation. ERCP has done successfully in 80.3% patients and therapeutics has done in 48.7% patients.
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