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Sri Benti Etika
Universitas Negeri Padang
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Penentuan Kondisi Optimum Desorpsi Anion Nitrit Dari Adsorben Silika Mesopori Termodifikasi DMA (Dimethylamine) Deni Marlina; Budhi Oktavia; Sri Benti Etika; Syamsi Aini
Periodic Vol 12, No 2 (2023): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v12i2.118085

Abstract

Mesoporous silica is a solid silica having a pore size of 2-50 nm. Mesoporous silica can be immobilized to the surface. Modification of mesoporous silica with dimethylamine aims to modify amine compounds. Mesoporous silica with the addition of amine compounds reacted with GPTMS can be used as nitrite anion adsorption to see the absorption of silica to nitrite anions using the column method, the adsorption capacity of nitrite anions is 0.0182 mg/g with an absorption percentage of 96.71%. Then the desorption process was carried out, the factor used to see the desorption ability was the type of desorption, namely hydrochloric acid (HCl) with the release of 0.0071 mg of nitrite anion from 0.0085 mg of nitrite anion that was absorbed and the percentage of desorption was 83.52% and a concentration factor with the optimum concentration of 0.15M HCl with the release of 0.0091 mg of nitrite anion with 100% desorption percentage.
Studi Kompleks Asosiasi Logam Berat Timbal (Pb) dengan Menggunakan KI dan Methyl Green R, Yoanatul Hasanah; Nasra, Edi; Nizar, Umar Kalmar; Etika, Sri Benti
Periodic Vol 12, No 3 (2023): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v12i3.118451

Abstract

The measurement methods in this study used are UV-Vis and AAS ( Atomic Absorption Spectrophotometer). The Pb(NO3)2 solution is dissolved with excess iodide so that it forms a PbI42- anion complex. This anion complex is then reacted with the cationic dye methyl green forming an association complex [PbI4][MG].The result of this study is that the maximum wavelength of the PbI42- anion complex is at 267 nm with stability time of 2 hours. Then the iodide concentration is 0,333 M with an absorbance 0.795 then the maximum wavelength of the association complex [PbI4][MG] is 636 nm at pH 5 and methyl green concentration is 0.00013% and has a concentration factor 20,39 times.
Kondisi Optimum Adsorpsi Ion Logam Ni2+ Oleh Silika gel-GPTMS Termodifikasi Sulfonat Ramadhani, Dwi; Oktavia, Budhi; Kurniawati, Desy; Etika, Sri Benti
Periodic Vol 13, No 2 (2024): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v13i2.124480

Abstract

Silica gel is a compound that has two active sides, namely silanol (Si-OH) and siloxane (Si-O-Si) which have not been effective as adsorbents so modifications are made. Silica gel is modified using monosodium salt 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid which is reacted first with GPTMS (glycidoxypropyltrimethoxysilane) as a connecting bridge to produce sulfonate-modified silica gel-GPTMS adsorbent. The purpose of this modification is that sulfonate-modified silica gel-GPTMS are made to adsorb Ni2+ metal ions under optimum conditions at pH, contact time and concentration. The adsorption process is carried out using the batch method by seeing how much adsorbent adsorption capacity is made against the absorption of metal ions. The characterization used is an FTIR (Fourier Transform-Infrared) spectrophotometer in the analysis of the adsorbent manufacturing process and SSA (Atomic Absorption Spectrophotometry) to see the results of metal ion absorption. The results obtained according to research that has been conducted show the adsorption of sulfonate-modified silica gel-GPTMS against the absorption of Ni2+ metal ions at optimum conditions is at pH 3 and contact time for 45 with absorption capacities of 1.5265 mg/g and 1.5826 mg/g respectively.
Analisis Sifat Fisikokimia dari Beberapa Minyak Kemasan Hasil Penggorengan Tempe Farhan, Muhammad; Azhar, Minda; Etika, Sri Benti; Pernadi, Niza Lian; Sabrina, Joya; Rahmi, Fathaniah Raviqa; Nizar, Umar Kalmar
Periodic Vol 13, No 1 (2024): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v13i1.124341

Abstract

Cooking oil is one of the staple ingredients for cooking which is very popular in Indonesian society. The cooking oil most often used for cooking by the community is palm oil, because it is easy to obtain and has a relatively affordable price. But on the other hand cooking oil which is repeatedly heated at high temperatures can have harmful effects on the body, especially with the presence of solutes in the ingredients that are fried. This study aims to determine the quality of palm oil from tempe frying which contains vegetable protein for 1 hour at 160 C. The cooking oil is heated for 1 hour then put in the tempe and removed after it is cooked, after 1 hour the oil is cooled and its quality is tested by testing the density, flow rate, acid number and saponification number. The results showed that after cooking for 1 hour testing the tempe frying oil, the quality of the oil based on the quality standard value was bimoli, followed by pure essence and fortune. The quality of bimoli oil from tempe frying for one hour was with a density of 0.9233 gr/mL, a flow rate of 3.805 mL/s, an acid number of 8.0536 mgKOH/g and a saponification number of 16.091 mgKOH/g.
Efektifitas ZnO doping TiO2 Dalam Mendegradasi Zat Warna Metil Hijau dengan Metode Fotolisis Alfarisi, Fadil; Sanjaya, Hary; Beri, Deski; Etika, Sri Benti
Periodic Vol 12, No 3 (2023): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v12i3.118598

Abstract

The textile industry sector in Indonesia is progressing. This progress is not followed by good and effective waste management. Methyl green dye waste is one example. Methyl green is organic waste that is difficult to decompose and is toxic. Therefore, an effective method is needed to decompose organic waste into environmentally friendly compounds using the photolysis method. This study aims to obtain the optimum time and the optimum concentration of TiO2 doping on the degradation of Methyl green by photolysis. The percentage of degradation of Methyl green was obtained from the measurement of the absorbance value using a UV-Vis spectrophotometer at the maximum wavelength of Methyl green (λmax) and the maximum wavelength was obtained at 640 nm. The results are the optimum time of degradation of Methyl green dye at radiation time of 150 minutes with a degradation percentage of 97.5%. In the variation of TiO2 dopant concentration, the optimum concentration of TiO2 dopant was found at 10% ZnO-TiO2 with 95% degradation.
Skrining Fitokimia Ekstrak Metanol Dari Kulit Buah Salak (Salacca zalacca) Fadhila, Dina; Etika, Sri Benti
Periodic Vol 12, No 3 (2023): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v12i3.117968

Abstract

Salacca zalacca atau yang disebut dengan snakefriut merupakan salah satu tanaman yang termasuk dalam keluarga palma. Salah satu bagian tanaman ini yang dapat dimanfaatkan adalah gorong-gorong buah. Kulit buah salak ini bisa dimasak sebagai minuman yang bisa menjadi obat penyakit diabetes. Pada penelitian ini dilakukan skrining fitokimia untuk mengidentifikasi senyawa metabolit sekunder yang terkandung pada kulit buah salak (Salacca zalacca). Hasil skrining fitokimia kulit buah salak menunjukkan bahwa kulit buah salak (Salacca zalacca) mengandung metabolit sekunder alkaloid, flavonoid dan saponin, tetapi tidak mengandung terpenoid dan steroid.
Pengaruh Ukuran Partikel dan Laju Alir Terhadap Biosorpsi Ion Cu(II) Menggunakan Biosorben Kulit Langsat (Lansium domesticum) Hardianti, Amirah Salsabila; Kurniawati, Desy; Etika, Sri Benti; Sanjaya, Hary
Periodic Vol 13, No 3 (2024): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v13i3.125611

Abstract

Cu2+ ion is a dangerous metal ion produced from various industrial wastes that need to be addressed. Excess and high concentrasions of absorbed Cu2+ ions can disrupt health and ecosystems because they are difficult to degrade and easily accumulate in the body. This study aims to determine the optimum conditions for the absorption of Cu2+ ions using langsat fruit peel on the effect of particle size and flow rate by column method. Adsorption of Cu metal ions with langsat fruit peel biosorbent obtained optimum conditions at adsorbent particle size of 150 micrometers with adsorption capacity of 13,963 mg/g and flow rate of 1 mL/minute with adsorption capacity of 13,442 mg/g. This shows that langsat fruit peel is one of the best biosorbents in absorbing metals with large absorption capacity data.
Uji Aktivitas Antioksidan Ekstrak Metanol Tangkai Daun Strawberry (Fragaria x annanasa) Dengan Metode DPPH Ayunda, Sarah; Etika, Sri Benti
Journal of Natural Sciences Vol 5, No 3 (2024): Journal of Natural Sciences November
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v5i3.697

Abstract

Free radicals are molecules that have one or more unpaired electrons in their outer orbit and are highly reactive. The severe reactions produced by highly reactive free radicals can produce unusual compounds and damage vital body cells. This study aims to determine the content of secondary metabolites and test the antioxidant activity of methanol extract of Strawberry  stem (Fragaria x annanasa). The Strawberry  stem samples used came from the Alahan Panjang area, West Sumatra. Extraction was carried out by maceration method using methanol solvent. The results of the maceration were then evaporated using a rotary evaporator to obtain a thick methanol extract of 13.3037 grams. Methanol thick extract was analyzed for secondary metabolite content by phytochemical screening. Antioxidant activity test using DPPH method. Methanol extract of Strawberry  petiole contains alkaloids, saponins and phenolics that have antioxidant activity that can counteract the formation of free radicals. The results of antioxidant tests conducted using UV-Vis spectrophotometry on methanol extract of Strawberry  petiole showed an IC50 value of 33.4816 ppm with a comparison using vitamin C as a positive control showing an IC50 value of 22.3024 ppm.
Study of The Antibacterial Activity of Endophytic Fungus That Colonize With The Twig of Andrographis paniculata Anshar Al Khairi, Varel; Etika, Sri Benti; Suryelita, Suryelita; Ulfah, Mariam; Riga, Riga
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 22 No. 2 (2021): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1063.338 KB) | DOI: 10.24036/eksakta/vol22-iss2/266

Abstract

Reports of the chemical constituents of Andrographis paniculata showed that this plant produced various secondary metabolites with antibacterial activity. Further exploration of bioactive compounds from A. paniculata can also be conducted by analyzing its endophytic fungi. Isolation of endophytic fungi from the twig of A. paniculata obtained three isolates of endophytic fungi. One of the isolates, RS-2, was fermented on rice media and extracted with ethyl acetate to give the EtOAc extract. The EtOAc extract from fungus RS-2 was analyzed for their antibacterial and phytochemical screening. The results exhibiting the EtOAc extract of fungus RS-2 has activity to inhibite bacterial growth. Overall, the study of the antibacterial activity of endophytic fungus obtained from the twig of A. paniculata was firstly carried out in this study
Peningkatan Pemurnian Minyak Jelantah melalui Sistem Adsorben Ganda: Bleaching Earth dan Karbon dari Kulit Buah Kakao (Theobroma cacao L) Utami, Esssylia Afriyanti; Nizar, Umar Kalmar; Etika, Sri Benti
MASALIQ Vol 5 No 3 (2025): MEI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i3.6039

Abstract

Used cooking oil (minyak jelantah) is a household and industrial waste product that poses environmental risks and undergoes significant quality degradation due to the breakdown of chemical compounds during repeated use. This study aims to evaluate the effectiveness of a combination of activated carbon derived from cocoa pod husk waste and bleaching earth in improving the quality of used cooking oil. The research was conducted experimentally in the laboratory of Universitas Negeri Padang using used cooking oil obtained from local vendors. Activated carbon was prepared by calcining cocoa pod husks at 350°C for varying durations of 30, 45, 60, and 75 minutes, followed by activation with 1M NaOH solution. The purification process was carried out in stages through the addition of activated carbon and bleaching earth under controlled heating conditions. Parameters analyzed included acid number, moisture content, density, saponification value, and functional group characterization using infrared spectroscopy (FTIR). The results indicate that the most effective adsorbent combination was achieved with activated carbon calcined for 60 minutes, which reduced the acid number from 14.92 to 5.09 mg KOH/g, decreased moisture content to 0.11%, and increased the saponification value to 75.30 mg KOH/g. The FTIR spectrum showed reduced intensity in functional groups associated with degradation, indicating effective purification. In conclusion, the combination of activated carbon from cocoa pod husk waste and bleaching earth is proven effective in improving the physicochemical quality of used cooking oil, while also demonstrating the potential for sustainable and environmentally friendly use of agricultural waste as raw material for adsorbents.
Co-Authors Alfarisi, Fadil Ananda Putra Andriati Fitria Wati Annisa Dewi Pangestuti Anshar Al Khairi, Varel Anwar Saputra Ayunda, Sarah Bahrizal Bahrizal Budhi Oktavia Budhi Oktavia Citra Devira Deni Marlina Deski Beri Desy Kurniawati Desy Kurniawati Desy Kurniawaty Dewi Fortuna Khairil Dewi Kristina Dwi Finna Syolendra DWI RAMADHANI Edi Nasra Elfanny Delvia Endang Widaya Nengsih Fadhila, Dina Fitri Yuranda Hardianti, Amirah Salsabila Hary Sanjaya Hesty Parbuntari Indah Nulfia Indang Dewata Iryani Iryani Iryani Iryani Iswendi Iswendi Ivana Putri Laura Dwi Rha Hayu Mahmud Mahmud Mahmud Mahmud Manalu, Silvani Indriani MARIAM ULFAH ULFAH Melisa Yolanda Minda Azhar Muhammad Afif Muhammad Farhan Mulia, Melindra Nazulis Z Nivi Suci Kurnia Niza Lian Pernadi Nizar, Umar Kalmar Pernadi, Niza Lian Putri Diana Putri, Dafnesy Rahmadhani R, Yoanatul Hasanah Rahmi, Fathaniah Raviqa Rani Aulia Suhanah Rani Aulia Suhanah Regi Fadila Putra Revi Ernanda Ridho Hermawan Rido Ardianto Riga Riga Riga, Riga Rini Anggraini Rita Sundari Sabrina, Joya Salsabila Safitri Salsabila, Salsabila Sintha Hafizhah Yonel Siska Oktariza Sri Teguh Priharti Sridevitri, Sridevitri Suryelita . Suryelita, Suryelita Susiyati Safitri Syamsi Aini Teuku Muhamad Khairudin Trisna Kumala Sari Ulfah, Mariam Umar Kalmar Nizar Utami, Esssylia Afriyanti Varel Anshar Al Khairi Vinezia Sri Wahyuni Yogi Fernanda Saputra Yulia Rahmatika Yusmaita, Eka Yustini Ma’aruf