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All Journal Abdimas Indonesian Journal of Chemical Science
F. Widhi Mahatmanti
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Arts Humanities Chemistry Physics Social Sciences

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PEMANFAATAN KOTORAN KAMBING SEBAGAI PUPUK KOMPOS UNTUK MENINGKATKAN KEBERSIHAN LINGKUNGAN DI KELURAHAN MANGUNSARI KECAMATAN GUNUNGPATI KOTA SEMARANG F. Widhi Mahatmanti; Puji Lestari; Rini Susanti Wulandari
Jurnal Abdimas Vol 15, No 2 (2011): December 2011
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/abdimas.v15i2.4580

Abstract

Masalah yang akan diungkap adalah bagaimana menerapkan teknologi pembuatan pupuk kompos dari kotoran kambing dalam rangka meningkatkan kebersihan lingkungan di Kelurahan Mangunsari Kecamatan Gunung Pati Kota Semarang. Tujuan utama dari kegiatan pengabdian kepada masyarakat ini adalah memberi wawasan dan mengenalkan serta memasyarakatkan penerapan teknologi pembuatan pupuk kompos dari kotoran kambing kepada masyarakatsekitar Kelurahan Mangunsari. Kegiatan pengabdian kepada masyarakat untuk warga Kelurahan Mangunsari telah dilaksanakan mulai tanggal 1 sampai dengan 31 Juli 2011. Kegiatan pengabdian kepada masyarakat ini dilakukan dengan langkah metodologis yang meliputi identifikasi, pengorganisasian, penyuluhan, pelatihan, program aksi dan evaluasi. Metode penyuluhan digunakan untuk memberi wawasan yang bersifat teoritis dan praktis tentang materi pengabdian yaitu proses pembuatan pupuk kompos. Materi pelatihan diberikan dalam bentuk variatif yaitu ceramah, diskusi dan tanya jawab, demonstrasi dan praktek pembuatan pupuk kompos. Alokasi waktu dalam program aksi dibuat yang paling besar. Berdasarkan hasil uji fisika dan kimia diperoleh dari laboratorium, pupuk kompos yang dihasilkan oleh kelompok masyarakat sudah memenuhi standar kualitas kompos (SNI 19-7030-2004). Tekstur kotoran kambing adalah khas, karena berbentuk butiran-butiran yang agak sukar dipecah secara fisik sehingga sangat berpengaruh terhadap proses dekomposisi dan proses penyediaan haranya.
Biopolymers of Chitosan-Anthocyanin From Purple Sweet Potatoes (Ipomoea Batatas L.) Extract and Their Interaction with Formalin Riska Putri Mawarni; F. Widhi Mahatmanti; Harjono; Mohammad Alauhdin
Indonesian Journal of Chemical Science Vol. 13 No. 1 (2024)
Publisher : Prodi Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v13i1.3865

Abstract

Purple sweet potato is one of the potential sources of anthocyanins. Anthocyanins can be utilized in various fields, such as sensors. Chitosan biopolymer allows formulation with anthocyanins because it possesses biodegradable and antimicrobial properties, and it does not inhibit color changes from anthocyanins. This study aims to prepare anthocyanins from purple sweet potatoes, formulate chitosan-anthocyanin biopolymer (CAB), and test the effect of time and formalin concentration on color changes in CAB. The research results show: 1) anthocyanin extract (TAC) from purple sweet potatoes is 852 mg/L with anthocyanin monomer (cyanidin) of 443.03 mg/500 g or 88.61 mg/100g. Anthocyanin extract at pH 1-12 has colors ranging from red to brownish-yellow; 2) CAB was successfully formulated with anthocyanin extract from purple sweet potatoes, chitosan, and glycerin. BKA-A was obtained with a content of 10 mL anthocyanin extract and CAB-B with 15 mL anthocyanin extract; 3) the produced biopolymers have average swelling values of 444% (CAB-A) and 339.5% (CAB-B). The storage time of CAB-B is longer than CAB-A. FTIR analysis showed a broad peak at ~3336 cm-1 indicating hydroxyl groups from anthocyanin extract; and 4) ANOVA test results showed that interaction time and formalin concentration affect color changes in CAB-A partially, while color changes in CAB-B are only influenced by interaction time with formalin.
Optimization of Microplate Type Uv-vis  Spectrophotometer Performance as an Antioxidant Activity Testing Instrument Martin Sulistyani; F. Widhi Mahatmanti; Nuril Huda; Ridho Prasetyo
Indonesian Journal of Chemical Science Vol. 13 No. 1 (2024)
Publisher : Prodi Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v13i1.5014

Abstract

Eliminating a compound's capacity to impede and neutralize free radical-induced oxidation processes is the goal of antioxidant activity analysis. The DPPH (pikrilhidrazil-2,2-difenil-1) method was the approach taken in this investigation. Simple, sensitive, stable, quick, straightforward, and suitable for usage with tiny sample volumes are some of the benefits of DPPH procedures. In this investigation, some plant extracts were employed as a comparison, with ascorbic acid serving as the control. In order to evaluate a microplate-type uv-vis  Spectrophotometer effectiveness as an antioxidant activity test tool, the study will determine its maximum wave, linearity, accuracy, and IC50 values. Wavelength selectivity is found in 517 nm. The results validation of the DPPH method for analyzing the activity of antioxidants. Measurements of the ascorbic acid solution as a control obtained R2 values of 0.9781 compared to the LoD and LoQ limits of 0.961 and 3.053 respectively. The IC50 of ascorbic acid, ginger and turmeric, respectively, was 14.7218 (strong), 29.9194 (very strong), and 52.4943 (strong). 
Co-Authors Harjono Martin Sulistyani Mohammad Alauhdin Nuril Huda PUJI LESTARI Ridho Prasetyo Rini Susanti Wulandari Riska Putri Mawarni