Ant plant Myrmecodia rumphii Becc. is an epiphytic plant that is widely used by local people as an herbal medicine to treat various diseases such as rheumatic and tumors. Methanol extract of M. rumphii Becc. showed high cytotoxicity against shrimp larvae Arthemia salina Leach and antioxidant potential as indicated by high inhibitory activity against DPPH radicals. In the present paper, we provide for the first time the results of phytochemical screening of ant plant M. rumphii Becc. Powder of M. rumphii Becc. was extracted with n-hexane, methylene chloride, ethyl acetate, and methanol then concentrated until concentrated extract was obtained. Test of compound groups was carried out qualitatively. The results showed that there were various metabolites of alkaloids, triterpenoids, steroids, flavonoids, phenolics, and tannins which were scattered in extracts with various levels of polarity. From these results it can be concluded that the plants of M. rumphii Becc's contains secondary metabolites which have interesting bioactivity.
Virgin Coconut Oil (VCO) is one of the product from coconuts. VCO has many benefits in health and industry. One method of making the VCO is often used today is the fermentation. Today many domestic industries produce virgin coconut oil (VCO) but in fact, the industry has not been all good in terms of quality. The use of activated carbon from candlenut shells as an adsorbent to increase the quality of VCO has studied. The parameters tested were water content, free fatty acid, and peroxide. The results showed a decline in water levels from 0.1655% to 0.0597%, peroxide number decrease from 0.1991% to 0.0991%, and the free fatty acid content of 0.4186% to 0.366%.
Salt hydrolysis is a difficult subject matter for some students, due to the characteristic aspects of chemical concepts and aspects of the learning model. Overcoming the difficulties of these students, one of them uses POGIL (Process Oriented Guided Inquiry Learning) learning. The POGIL learning model does not direct students in documenting material, so it is accompanied by mind mapping and summary. The purpose of this study was to determine the differences of students’ cognitive learning outcomes in the POGIL learning model by mind-mapping assignment between the students taught using the POGIL learning model with a summary assignment on salt hydrolysis material. This study used a quasi-experimental model with posttest only control group design. The results of this study showed that there were differences in cognitive learning outcomes which shown on the average value of students taught with POGIL learning models accompanied by assignments mind mapping higher compared to students who were taught with the POGIL learning model along with summary assignments.
<p class="E-JournalAbstractBodyIndo">Bahan magnetik (BM) pasir besi alam merupakan salah satu sumber adsorben magnetik. Selain BM, pasir besi alam juga mengandung bahan non-magnetik . Preparasi BM pasir besi dilakukan pada penelitian ini dengan tujuan untuk meningkatkan kadar unsur magnetik di dalamnya. Pasir besi alam yang digunakan berasal dari pesisir pantai Lansilowo. Preparasi dilakukan dengan pencucian menggunakan larutan HF dengan konsentrasi 0, 2, 5 dan 10%. Hasil analisis kadar unsur dengan XRF menunjukkan bahwa unsur dominan pada pasir besi Lansilowo adalah Fe dan Cr, yang merupakan unsur penyumbang sifat kemagnetan pada BM. Pencucian dengan larutan HF berbagai konsentrasi menyebabkan terjadinya perubahan kadar unsur pada BM. Semakin tinggi konsentrasi larutan HF mengakibatkan terjadinya peningkatan kadar Fe dan Cr total (89,56%) serta penurunan kadar Si (2,60%). Hasil penelitian menunjukkan bahwa konsentrasi larutan HF optimum yang digunakan adalah 10%.</p><p> </p>
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