Hasil Pencarian

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Hasil Pencarian

Ditemukan 9 dokumen yang sesuai dengan query
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Dhea Annora Maritza
"Asam glukonat (GA) dan asam xilonat (XA) merupakan contoh asam organik yang banyak digunakan sebagai platform chemical. Aplikasinya telah banyak di industri seperti pada sektor pangan, farmasi, hingga industri bangunan untuk asam xilonat. Kedua asam organik tersebut dapat diperoleh dari oksidasi glukosa dan xilosa. Salah satu alternatif dalam memperoleh bahan baku pembuatannya adalah dari biomassa lignoselulosa Beberapa tahun terakhir, biomassa lignoselulosa banyak digunakan sebagai bahan baku dalam pembuatan valuable chemical. Salah satu limbah yang dapat digunakan adalah pelepah kelapa sawit diketahui memiliki kandungan holoselulosa yang lebih tinggi dibandingkan bagian kelapa sawit lainnya yaitu sekitar 80-83%. Pada penelitian ini, asam glukonat dan asam xilonat diproduksi melalui fermentasi menggunakan Gluconobacter oxydans. Penggunaan Gluconobacter oxydans dalam proses fermentasi dipilih karena dapat mengoksidasi glukosa menjadi asam glukonat dan sekaligus mengoksidasi xilosa menjadi asam xilonat. Digunakan dua jenis medium fermentasi yaitu hidrolisat pelepah kelapa sawit dan media sintetik pada suhu 30 °C. Variasi kecepatan agitasi dan rasio inokulum dilakukan pada proses fermentasi untuk mendapatkan konsentrasi GA dan XA maksimum. Hasilnya menunjukkan bahwa Gluconobacter oxydans secara efektif mengubah hidrolisat pelepah kelapa sawit menjadi asam glukonat dan asam xilonat. Konsentrasi GA tertinggi dihasilkan pada jam ke-65 fermentasi yaitu sebesar 52,820 ± 12,883 g/L (rasio inokulasi 15% v/v, kecepatan agitasi 150 rpm) menggunakan medium sintetik dan 3,240 ± 0,661 g/L (rasio inokulasi 15% v/v, kecepatan agitasi 220 rpm) menggunakan medium hidrolisat. Sedangkan XA yang diperoleh menggunakan medium sintetik adalah sebesar 2,310 ± 1,431 g/L (rasio inokulasi 9% v/v, kecepatan agitasi 220 rpm) pada jam ke-96 fermentasi dan 0,325 ± 0,460 g/L (rasio inokulasi 5%, kecepatan agitasi 190 rpm) pada jam ke-24 fermentasi dengan menggunakan hidrolisat. Secara keseluruhan, penelitian ini mendukung pemanfaatan limbah pertanian secara berkelanjutan untuk menghasilkan asam organik yang berharga melalui proses fermentasi.

Gluconic acid (GA) and xylonic acid (XA) are examples of organic acids that are widely used as platform chemicals. It has many applications in industries such as food, pharmaceutical, and building industries for xylonic acid. Both organic acids can be obtained from the oxidation of glucose and xylose. One of the alternatives in obtaining raw materials for its manufacture is from lignocellulosic biomass. In recent years, lignocellulosic biomass has been widely used as a raw material in the manufacture of valuable chemicals. One of the wastes that can be used is palm fronds which are known to have a higher holocellulose content than other parts of palm oil, which is around 80-83%. In this study, gluconic acid and xylonic acid were produced by fermentation using Gluconobacter oxydans. The use of Gluconobacter oxydans was chosen because it can oxidize glucose to gluconic acid and oxidize xylose to xylonic acid at once. Two types of fermentation medium were used in this research, which are hydrolyzed palm fronds and synthetic media at 30 °C incubation. Variation of agitation speed and inoculum ratio were carried out during the fermentation process to obtain maximum GA and XA concentrations. The results show that Gluconobacter oxydans effectively change the hydrolysate of palm fronds into gluconic acid and xylonic acid. The highest GA concentration was produced at the 65th hour of fermentation, namely 52.820 ± 12.883 g/L (15% v/v inoculation ratio and 150 rpm agitation speed) using synthetic medium and 3.240 ± 0.661 g/L (15% v/v inoculation ratio and 220 rpm agitation speed) using hydrolysate medium. Whereas the XA obtained using synthetic medium was 2.310 ± 1.431 g/L (9% v/v inoculation ratio and 220 rpm agitation speed) at the 96th hour of fermentation and 0.325 ± 0.460 g/L (5% inoculation ratio and 190 rpm agitation speed) at the 24th hour of fermentation using hydrolysate. Overall, this research supports the sustainable use of agricultural wastes to produce valuable organic acids through the fermentation process."
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Depok: Fakultas Teknik Universitas Indonesia, 2023
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UI - Skripsi Membership  Universitas Indonesia Library
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Khairissa Trisliani Asmara
"Penelitian terhadap pengetahuan etnobotani dan perspektif pengembangan Arenga pinnata oleh masyarakat Desa Bulumario, Kecamatan Sipirok, Sumatera Utara telah dilaksanakan pada Bulan Agustus-Oktober 2019. Penelitian bertujuan mendokumentasikan pengetahuan masyarakat mengenai pemanfaatan tumbuhan dan jenis tumbuhan apa saja yang penting bagi masyarakat Bulumario. Informasi yang dikumpulkan diharapkan dapat berperan dalam konservasi tumbuhan yang menunjang proses pengembangan kesejahteraan masyarakat di Desa Bulumario. Metode penelitian yang digunakan adalah wawancara secara mendalam dengan dipandu kuisioner, observasi partisipatif, dan survey lapangan. Pada penelitian etnobotani kategori guna terdapat 9 informan kunci dan 37 responden umum yang terdiri dari laki-laki dan perempuan yang berusia 30 tahun. Penelitian mengenai kajian pemanfaatan aren, responden adalah masyarakat yang bekerja sebagai petani aren, penyadap aren maupun tengkulak hasil produksi aren. Data di analisis secara kualitatif yaitu deskriptif dan kuantitatif yaitu nilai indeks kultural (ICS) dan analisis vegetasi. Hasil menunjukkan terdapat 164 spesies tumbuhan dari 63 famili yang dimanfaatkan masyarakat dalam berbagai kategori guna. Nilai ICS tertinggi adalah bargot (Arenga pinnata (Wurmb) Merr) yaitu sebesar 110 dengan pemanfaatan sebagai obat, pangan, ritual, minuman dan bahan bangunan. Pemanfaatan Arenga pinnata sebagai tumbuhan multiguna cukup tinggi di Bulumario, persebaran individu Arenga pinnata juga merata dengan kerapatan pohonnya 94 ind/ha. Bagian yang paling banyak dimanfaatkan adalah air nira yang berasal dari bunga jantan. Masyarakat Bulumario masih memanfaatkan aren yang tumbuh liar dan belum ada upaya budidaya tumbuhan tersebut.

Research on the ethnobotany knowledge and perspective of Arenga pinnata development by the people of Bulumario Village, Sipirok District, North Sumatra has been carried out in August-October 2019. The research aims to document public knowledge about the use of plants and what types of plants are important for the Bulumario community. The information gathered is expected to play a role in the conservation of plants that support the process of developing community welfare in Bulumario Village. The research method used was in-depth interviews guided by questionnaires, participatory observation, and field surveys. In the ethnobotany category uses there were 9 key informants and 37 general respondents consisting of men and women aged 30 years. For study of the use of sugar palm, respondents are people who work as sugar palm farmers, sugar palm tappers and middlemen from the production of palm sugar. The data were analyzed qualitatively namely descriptive and quantitative namely the value of the cultural index (ICS) and vegetation analysis. The results showed that there were 164 plant species from 63 families that were utilized by the community in various use categories. The highest ICS value is bargot (Arenga pinnata (Wurmb) Merr) which is 110 with utilization as medicine, food, ritual, drinks and building materials. Utilization of Arenga pinnata as a multipurpose plant is quite high in Bulumario, the individual distribution of Arenga pinnata is also evenly distributed with a tree density of 94 ind/ ha. The most widely used part is sap water that comes from male flowers. The people of Bulumario are still using the sugar palm that grows wild and there has been no attempt to cultivate these plants
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Depok: Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2019
T54936
UI - Tesis Membership  Universitas Indonesia Library
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Sangkilawang, Dennis Roy
Depok: Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1990
S17991
UI - Skripsi Membership  Universitas Indonesia Library
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Poppy Shafira Widya Putri
"Serat tandan kosong kelapa sawit (TKKS) merupakan limbah kelapa sawit yang pemanfaatannya masih sangat kurang di Indonesia. Serat ini memiliki potensi besar untuk menjadi bahan alternatif pengganti karbon hitam dan silika sebagai penguat dalam komposit karet. Akan tetapi, diperlukan coupling agent untuk meningkatkan kompatibilitas antarmuka karet alam dengan serat TKKS. Coupling agent hibrida poliisoprena-pati digunakan untuk meningkatkan kompatibilitas tersebut. Penelitian ini dilakukan untuk mengetahui pengaruh komposisi serat TKKS dan coupling agenthibrida poliisopren-patiterhadap sifat mekanik komposit karet alam-serat TKKS. Karakterisasi Fourier Transform Infrared (FTIR) Spectroscopy dan Scanning Electro Microscope (SEM), serta pengujian tarik dilakukan untuk medukung tujuan penelitian ini. Didapatkan kondisi optimal komposisi serat TKKS dan coupling agent hibrida poliisoprena-pati dalam komposit karet alam-serat TKKS yang meningkatkan kekuatan tarik hingga sebesar 26,568 MPa dan Modulus Young sebesar 1,117 MPa. Hal ini menandakan daya ikat antarmuka karet alam dengan serat TKKS meningkat dengan menggunakan coupling agent hibrida poliisoprena-pati. Peningkatan ini menunjukkan kompatibilitas karet alam dengan serat TKKS juga meningkat.

Oil palm empty fruit bunch (OPEFB) fiber is a palm waste that its utilization is lacking in Indonesia. This fiber has a great potential to be an alternative material to substitute carbon black and silica as fillers on natural rubber composite. However, a coupling agent is needed to enhance the compatibility of natural rubber and OPEFB fiber. Polyisoprene – starch hybrid based coupling agent was used to enhance this compatibility. This research was conducted to observe the effect of OPEFB fiber and polyisoprene – starch hybrid based coupling agent processes on mechanical properties of natural rubber – OPEFB fiber composite. Fourier Transform Infrared (FTIR) Spectroscopy and Scanning Electron Microscope (SEM) characterizations, also tensile test was done to support the objective of this research. The optimum compositions of fiber and coupling agent were obtained in which the tensile strength and Young's Modulus were increased up to 26,568 MPa and 1,117 MPa, respectively. This result showed that polyisoprene – starch hybrid coupling agent enhanced the interface adhesion of natural rubber and OPEFB fiber. This enhancement meant the compatibility of natural rubber and OPEFB fiber was also enhanced."
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Depok: Fakultas Teknik Universitas Indonesia, 2019
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UI - Skripsi Membership  Universitas Indonesia Library
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Wardah
"Palms diversity composition, and density i six selected sites of 15 rectangular plots of 100 x 20 m were successfully studies. The sites are in kasepuhan ciptagelar, which located in the Gunung Halimun Salak National Park in West Java. The sites are in the disturbed primary submontane forest at 800 to 1400 m altitude. Ethnobotanical observations made in some of the villages in kasepuhan ciptagelar proceeded through informal unending open interviews involving some traditional elders, prominent communities, and handicraftsmen. There is no species addition to the park from the kasepuhan cigelar. Three species of rattans (calamus polystachys, C. burckianus, and korthalsia laciniosa) are added to the park from Cibedug, Leuwijaming, Ciptarasa, and Cikidang. Young leaves of doemonorops rubra are used for traditional inner baduy cloth. The use of C. javensis canes for bracelets and rings, and the infructescence of plectocomia elongata for decoration are new findings "
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Bogor: Pusat Penelitian Biologi, 2009
BBIO 9:4 (2009)
Artikel Jurnal  Universitas Indonesia Library
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"Rattan is one of natural resources of Indonesia which contains 30%-40% cellulose. its high cellulose contents makes it very potential as a source of microcrystalline cellulose (MCC). In this research, manau rattan was characterized by using the chesson methods. Microcrystalline cellulose was prepared by using two methods, i.e. alkalization and acid hydrolysis. Alkalization was performed by soaking manau rattan powder into sodium hydroxide 17,5% for 8 hours. Acid hydrolysis was prepared by using sulfuric acid at a concentration of 0.1 M ; 0.3 M; and 0.5 M for 4, 6, 8, and 10 hours. The crystallinity MCC of 72.42% was obtained from acid hydrolysis with 0.5 M for 10 hours. The crystallinity of the MCC product increases with concentration and hydrolysis time"
JS 4:2 (2014)
Artikel Jurnal  Universitas Indonesia Library
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Mira Dameria
Depok: Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1990
S17878
UI - Skripsi Membership  Universitas Indonesia Library
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Aldithya Fakhri
"Latar belakang: Stres oksidatif adalah kondisi akumulasi radikal bebas di dalam sel atau jaringan akibat ketidakseimbangan produksi dan eliminasi radikal bebas. Stress oksidatif berkorelasi dengan banyak proses degeneratif dan patogenesis penyakit lainnya. Antioksidan merupakan senyawa yang dapat menetralisir antioksidan di dalam tubuh. Fitokimia yang terdapat di dalam tanaman merupakan salah satu sumber antioksidan eksogen yang paling banyak diteliti dan digunakan dalam pengobatan herbal. Salah satu tanaman yang berpotensi untuk diteliti lebih lanjut adalah buah kurma merah (Ziziphus jujuba). Penelitian ini bertujuan untuk meneliti komponen fitokimia yang terdapat di dalam buah kurma merah (Ziziphus jujuba) serta aktivitas antioksidannya. Metode: Penelitian ini merupakan penelitian deskriptif analitik. Sampel yang digunakan adalah buah kurma merah (Ziziphus jujuba) yang didapatkan dari daerah Tangerang. Ekstrak sampel dibuat dengan 3 jenis pelarut, yaitu n-heksana, etil asetat, dan etanol. Ketiga ekstrak dilakukan analisis komponen fitokimia secara kualitatif, kromatografi lapis tipis, dan uji kadar total. Uji aktivitas antioksidan dilakukan dengan uji spektrofotometri menggunakan reagen 2,2-difenil-1-pikrilhidrazil (DPPH). Pengujian aktivitas antioksidan tidak dilakukan pada ekstrak n-heksana karena tidak dapat larut dalam pelarut etanol sehingga tidak memenuhi syarat untuk dilakukan pengukuran Hasil: Ekstrak n-heksana memiliki hasil positif pada komponen fitokimia triterpenoid dan alkaloid. Ekstrak etil asetat memiliki nilai positif pada komponen fitokimia flavonoid, triterpenoid, dan alkaloid. Ekstrak etanol memiliki hasil positif pada komponen fitokimia flavonoid, glikosida, triterpenoid, dan alkaloid. Uji kromatografi lapis tipis menunjukan bahwa ekstrak n-heksana memiliki fraksi fitokimia flavonoid dan ekstrak etil asetat memiliki fraksi fitokimia fenol. Analisis antioksidan dari ekstrak etanol dan etil asetat menunjukan IC50 sebesar 224,78 μg/mL dan 525,23 μg/mL secara berturut-turut.
Kesimpulan: Ekstrak buah kurma merah (Ziziphus jujuba) memiliki beberapa komponen fitokimia, yaitu triterpenoid, alkaloid, flavonoid, glikosida, serta fenol dan tergolong antioksidan aktif serta berpotensi untuk dikembangkan menjadi antioksidan alami kedepannya

Background: Oxidative stress is a condition of accumulation of free radicals in cells or tissues due to an imbalance in the production and elimination of free radicals. Oxidative stress is correlated with many degenerative processes and the pathogenesis of other diseases. Antioxidants are compounds that can neutralize antioxidants in the body. Phytochemicals contained in plants are one of the most widely studied and used sources of exogenous antioxidants in herbal medicine. One of the plants that have the potential to be studied further is red dates (Ziziphus jujuba). This study aims to examine the phytochemical components contained in red dates (Ziziphus jujuba) and their antioxidant activity. Methods: This research is a descriptive-analytic study. The sample used was red dates (Ziziphus jujuba) obtained from the Tangerang area. Sample extracts were made with 3 types of solvents, namely n-hexane, ethyl acetate, and ethanol. The three extracts were analyzed qualitatively for phytochemical components, thin-layer chromatography, and total assay. Antioxidant activity test was carried out by spectrophotometric test using 2,2- diphenyl-1-picrylhydrazyl (DPPH) reagent. Testing of antioxidant activity was not carried out on the n-hexane extract because it cannot be dissolved in ethanol solvent so it does not meet the requirements for measurement Results: The n-hexane extract had positive results on the phytochemical components of triterpenoids and alkaloids. The ethyl acetate extract had a positive value on the phytochemical components of flavonoids, triterpenoids, and alkaloids. The ethanol extract had positive results on the phytochemical components of flavonoids, glycosides, triterpenoids, and alkaloids. Thin layer chromatography test showed that n-hexane extract had a flavonoid phytochemical fraction and ethyl acetate extract had a phenol phytochemical fraction. Antioxidant analysis of ethanol and ethyl acetate extracts showed IC50 of 224.78 g/mL and 525.23 g/mL, respectively.
Conclusion: Red date fruit extract (Ziziphus jujuba) has several phytochemical components, namely triterpenoids, alkaloids, flavonoids, glycosides, and phenols, and is classified as an active antioxidant and has the potential to be developed into natural antioxidants in the future.
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Jakarta: Fakultas Kedokteran Universitas Indonesia, 2021
S-pdf
UI - Skripsi Membership  Universitas Indonesia Library