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Synthesis of sodium-type fluorophlogopite mica from perlite and diatomite
Phongsak Laoot,Kunwadee Rangsriwatananon,Aphiruk Chaisena 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.3
Sodium-type fluorophlogopite mica was synthesized by a new and simple method (all-in-one) that consists of mixing diatomite,MgO and NaF, grinding, firing and washing. The solid products were characterized by powder X-ray diffraction (XRD),Fourier transform infrared spectrometry (FT-IR) and scanning electron microscopy (SEM). The results showed that a major phase with lattice spacings of the fluorophlogopite mica (NaMg3AlSi3O10F2) formed was observed at d = 9.73 and d = 3.24 Åfor a single sheet of an interlayer with an anhydrous phase obtained at 1000-1100 oC for 48-72 h. The peak intensity of the sodium-type fluorophlogopite mica became stronger with increasing temperature and time.
Preparation of zeolite N from metakaolinite by hydrothermal method
Paiboon Sengyang,Kunwadee Rangsriwatananon,Aphiruk Chaisena 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.1
Zeolite N was successfully prepared from activated Narathiwat kaolinite. Kaolinite activation was performed by the thermal treatment at 700 o C for 5 h. The thermally activated, amorphous kaolinite (metakaolinite) was treated hydrothermally with KOH, KCl, and H2O at 80, 90, 110, 130, 150, and 175 o C during different reaction times ranging from 2 h to 24 h. The synthesis products were characterized by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy in order to elucidate their physicochemical and characteristics. The results show that zeolite N was obtained with high crystalline when the K2O/Al2O3, KCl/Al2O3, and H2O/Al2O3 molar ratios were 2.3, 3.5, and 48.0 by hydrothermal treatment at 175 o C for 24 h. The cation exchange capacity of zeolite N was 590 meq 100 g−1 . Thus, the kaolinite can be used as a source of silica and alumina for the synthesis of zeolite N.
( Kanta Pranweerapaiboon ),( Kunwadee Noonong ),( Somjai Apisawetakan ),( Prasert Sobhon ),( Kulathida Chaithirayanon ) 한국미생물생명공학회(구 한국산업미생물학회) 2021 Journal of microbiology and biotechnology Vol.31 No.6
Sea cucumber, Holothuria scabra, is a well-known traditional Asian medicine that has been used for suppressing inflammation, promoting wound healing, and improving immunity. Moreover, previous studies demonstrated that the extract from H. scabra contains many bioactive compounds with potent inhibitory effect on tumor cell survival and progression. However, the effect of the methanolic extract from the body wall of H. scabra (BWMT) on human prostate cancer cells has not yet been investigated. In this study, we aimed to investigate the effects and underlying mechanism of BWMT on prostate cancer cell viability and metastasis. BWMT was obtained by maceration with methanol. The effect of BWMT on cell viability was assessed by MTT and colony formation assays. The intracellular ROS accumulation was evaluated using a DCFH-DA fluorescence probe. Hoechst 33342 staining and Annexin V-FITC/PI staining were used to examine the apoptotic-inducing effect of the extract. A transwell migration assay was performed to determine the anti-metastasis effect. BWMT significantly reduced cell viability and triggered cellular apoptosis by accumulating intracellular ROS resulting in the upregulation of JNK and p38 signaling pathways. In addition, BWMT also inhibited the invasion of PC3 cells by downregulating MMP-2/-9 expression via the ERK pathway. Consequently, our study provides BWMT from H. scabra as a putative therapeutic agent that could be applicable against prostate cancer progression.