Turmeric is a tropical plant that is widely found on the Asian continent which is extensively used as a food coloring agent and fragrance. Ginger is a spice plant that it often found in South Asia which is widely has spread throughout the world. Coconut is an annual plant, has a hard stem and is generally not branched (monopodial), has fibrous roots, and contain water that is clear and tastes sweet, young coconut water has benefits such as antibacterial, beauty treatment, as an isotonic agent, and carry out the urination. This research was conducted to obtain information about the physicochemical properties and secondary metabolites contents of the coconut water, ginger and turmeric combination extract. The research method was carried out by mixing the mashed turmeric and ginger with the young coconut water and then macerated. The resulting extract was then tested for physicochemical properties (solubility) and identified groups of secondary metabolites (flavonoids, tannins, saponins, and steroids/triterpenoids. The extract was soluble in 70% ethanol. In addition, the combination of young coconut water, ginger, and turmeric extract contain a group of secondary metabolites among others flavonoids, tannins, saponins, and triterpenoids.
Plastic waste is a topic that is always discussed in academic studies, especially regarding for the environment. Plastic waste causes natural damage whether it is biotik or abiotik environment. Lack of understanding of the plastic waste dangers caused tless of the environment concern. This is illustrated by the behavoir of throwing plastic waste not on the rubbish bin. By the socialization of plastic waste education and its utilization, it is expected can improve the intellectual understanding about the risk of plastic waste. This activity was initiated by a group of young people in the Kupang city whose joined to the community of"Saya Pilih Bumi" in Kupang regional by involving speakers from Widya Mandira Catholic University of Kupang City. The method of carrying out the socialization activities is by surveying and requesting permission to the school, then two activities are carried out there are education of plastic waste and plastic waste treatment. The success of these program was indicated by thestudents enthusiasm in the discussion session and the results of processing plastic waste yield some goods like flower pots, pencil cases and other accessories.
Turmeric rhizome is a source of natural yellow pigment which can be applied as a pH indicator. This pigment was extracted from turmeric rhizomes using ethanol as a solvent. The purpose of this study was to examine the application of turmeric rhizome pigment extract (TRPE) as an indicator to determine the concentration of H+, the precision and accuracy of the use of TRPE as an indicator of acid base titration. As a comparison, in this study used also a standard indicator, such as phenolphthalein (PP) and methyl red (MR). Titration was carried out on samples without spike and spike samples. The result showed that the rendement of TRPE was 35.72%. The concentration of H+ on the sample without spikes in the titration of strong acid-strong base (SASB) and strong acid-weak base (SAWB) using TRPE, PP and MR indicators gave the same result, namely 0.041 M. The concentration of H+ on spike samples in SASB and SAWB titrations using TRPE, PP and MM indicators gave the same result, namely 0.165 M. The use of TRPE in the titration of SASB, SAWB, weak acid-strong base (WASB) and weak acid-weak base (WAWB) provided good precision with the coefficient of variation (CV) obtained in the titration of samples without spikes and titrations of spike samples, respectively are 1.2% and 0.35%, but only give good accuracy in SASB and SAWB titration with the recovery in the range of 102.3%-102.7%.Keywords: accuracy; acid base; precision; titration; turmeric ABSTRAKAplikasi Pigmen Rimpang Kunyit Sebagai Indikator Titrasi Asam-BasaRimpang kunyit merupakan salah satu sumber pigmen kuning alami yang dapat diaplikasikan sebagai indikator pH. Pigmen ini diperoleh dengan cara mengekstraksinya dari rimpang kunyit menggunakan pelarut etanol. Penelitian ini bertujuan untuk mengkaji aplikasi ekstrak pigmen rimpang kunyit (EPRK) sebagai indikator untuk menentukan konsentrasi H+ dalam sampel, presisi dan akurasi dari penggunaan EPRK sebagai indikator titrasi asam basa. Sebagai pembanding maka dalam penelitian ini digunakan pula indikator standar yakni fenolftalin (PP) dan metil merah (MM). Titrasi dilakukan terhadap sampel tanpa spike dan sampel spike. Berdasarkan hasil penelitian diperoleh rendemen EPRK sebanyak 35,72%. Konsentrasi H+ dalam sampel tanpa spike pada titrasi asam kuat-basa kuat (AKBK) dan asam kuat-basa lemah (AKBL) menggunakan indikator EPRK, PP dan MM memberikan hasil yang sama yaitu 0,041 M. Konsentrasi H+ dalam sampel spike pada titrasi AKBK dan AKBL menggunakan indikator EPRK, PP dan MM memberikan hasil yang sama yaitu 0,165 M. Penggunaan EPRK dalam titrasi AKBK, AKBL, asam lemah-basa kuat (ALBK) dan asam lemah-basa lemah (ALBL) memberikan presisi yang baik dengan coefficient of variation (CV) yang diperoleh pada titrasi sampel tanpa spike dan titrasi sampel spike berturut-turut adalah ˂ 1,2% dan ˂ 0,35%, tetapi hanya memberikan akurasi yang baik pada titrasi AKBK dan AKBL dengan recovery yang diperoleh adalah pada kisaran 102,3%-102,7%.Kata Kunci: akurasi; asam basa; presisi; titrasi; kunyit
Avocados (Persea americana Mill.) have many benefits for traditional medicine especially in East NusaTenggara. The purpose of this study was to analyze the secondary metabolite compounds contained in avocado seeds and to identify groups compounds in avocado seeds extract. The research method used was maceration of samples for 3 days and continued with phytochemical dan FT-IR test. The result showed that methanol extract of avocado seeds contains phytochemicals based on test result of secondary metabolites, the alkaloids, flavonoids, steroids, terpenoids, saponins and tannins. While the results of FT-IR analysis showed the presences of OH, CH, C=C, and C-O groups.
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