Marcelina Marcelina, Marcelina
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Profil saliva pada penyirih di Kecamatan Rembon Kabupaten Tana Toraja Salivary profile of betel quid tobacco chewers in District of Rembon, Tana Toraja Marcelina, Marcelina; Samad, Rasmidar
Journal of Dentomaxillofacial Science Vol 12, No 2 (2013): Formerly Jurnal Dentofasial ISSN 1412-8926
Publisher : DiscoverSys Inc

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Abstract

Betel quid tobacco (BQT) chewing is a process of chewing betel leaves, areca nut, lime, gambier, and tobacco. Chewing and chemical stimulation of BQT can affect the salivary profile. The purpose of this study is to observe the differences of salivary profile such as volume, pH, and salivary inorganic component (Na + and phosphate) between BQT chewers and non-chewers. This study is an observation analytic with cross sectional design on 30-60 years old women that live in Rembon district of Tana Toraja (n=96) using cluster random sampling technique. Salivary volume was measured by measured glass, salivary pH was measured by indicator pH (Macherey-Nagel). The content of the salivary inorganic component was seen using atomic absorption spectrophotometer in BPTP Laboratory, Maros. Data were analyzed by t-test and chi square test using SPSS v 15.0. The result were mean of salivary volume (chewers=3.88 ml/10 s; p=0.051). Mean of salivary pH (chewers=6.92; p=0.001). Mean of salivary Na+  (chewers=0.38 ppm; p=0.112), Mg2+ (chewers=11.9 ppm; p=0.002), phosphate (chewers=156.8 ppm; p=0.001), Ca 2+ (chewers=174.8 ppm; p=0.000), K concluded that there was no significant difference on salivary volume, pH, Na+, K+, Ca2+, Mg(chewers=445.9 ppm; p=0.429). It was +and K+ content between chewers and non chewers, but the content of salivary Mg 2+, Ca2+and phosphate had significant difference.
Investigation on the Effect of Addition of Fe3+ Ion into the Colloidal AgNPs in PVA Solution and Understanding Its Reaction Mechanism Roto, Roto; Marcelina, Marcelina; Aprilita, Nurul Hidayat; Mudasir, Mudasir; Natsir, Taufik Abdillah; Mellisani, Bella
Indonesian Journal of Chemistry Vol 17, No 3 (2017)
Publisher : Universitas Gadjah Mada

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Analysis of Fe3+ ion present in aqueous solutions is always of interests. Recently, this ion has been analyzed by colorimetric methods using colloid of silver nanoparticles (AgNPs) in capping agents of polymers. The reaction mechanism between AgNPs and Fe3+ is still subject to the further investigation. In this work, 1,10-phenanthroline was used to probe the reaction mechanism between AgNPs and Fe3+ ion in the solution. The colloids of AgNPs were prepared in the polyvinyl alcohol (PVA) solution and reacted with Fe3+. The colloid surface plasmon absorbance decreases linearly along with the increase in Fe3+ concentration. The addition of 1,10-phenanthroline to mixture changes the solution to red, indicating that the reaction produces Fe2+. This suggests that the reduction of the AgNPs absorbance is the result of oxidation of the Ag nanoparticles along with the reduction of Fe3+.