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All Journal JURNAL KIMIA SAINS DAN APLIKASI
Agustina L. N. Aminin
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University, Jl. Prof. Soedarto, SH., Tembalang, Semarang|Diponegoro University|Indonesia
Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering

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Optimization of Cellulase Production by Aspergillus niger InaCC F506 in Solid-State Fermentation of Tofu Dreg Talisia Kresna Shih; Agustina L. N. Aminin; Nies Suci Mulyani
Jurnal Kimia Sains dan Aplikasi Vol 25, No 11 (2022): Volume 25 Issue 11 Year 2022
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.25.11.419-426

Abstract

Indonesia has a growing demand for cellulase enzymes; however, 99% of the enzymes are imported from other countries. Aspergillus niger is well recognized for using the widely accessible tofu by-product, often known as tofu dreg, as a growth medium for synthesizing cellulase enzymes. This study aims to optimize the production of cellulase enzymes by Aspergillus niger InaCC F506 using tofu dregs as a substrate through the Solid-State Fermentation (SSF) method by varying the additives. The results showed that the E fermentation system with the composition of urea 0.5%; CMC 0.5%; KH2PO4 0.2%; MgSO4.7H2O 0.2% produced the highest cellulase enzymes from the tofu dregs substrate. The highest cellulase enzyme activity was at a fraction of ammonium sulfate saturation level of 40-60%. The optimum condition of enzyme activity was observed at pH 5 with an activity of 33 x 10-4 Units/mg protein and at 30℃ with an activity of 31 x 10-4 Units/mg protein.
Antioxidant and Antimicrobial Screening of Endophytic Fungi Culture Filtrate from Purwoceng (Pimpinella alpina Molk) Leaf Agustina L. N. Aminin; Nur Cahyanti; Alfina Sari; Nies Suci Mulyani; Bambang Cahyono
Jurnal Kimia Sains dan Aplikasi Vol 23, No 9 (2020): Volume 23 Issue 9 Year 2020
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (37.232 KB) | DOI: 10.14710/jksa.23.9.319-324

Abstract

This is a preliminary study to determine the bioactivity potential of purwoceng leaf endophytic fungal metabolites. Endophytic fungi were isolated from purwoceng leaf and their secondary metabolite from culture filtrate were subjected to identify the antimicrobial, antioxidant, and phytochemical screening. The antioxidant activity was screened by scavenging 2,2-diphenyl-1-picrylhydrazyl (DPPH). The antimicrobial activity was screened using a good agar method toward Salmonella typhi, Escherichia coli, Bacillus subtilis, Staphylococcus aureus, dan Candida albicans. This study obtained five distinctive endophytic fungi isolates named A, B, C, D, and E. The endophytic fungal culture filtrate of C has the most extensive antimicrobial activity with phytochemical screening showing alkaloids, saponins, and terpenoids. The antioxidant potential of all culture filtrates seemed low because the DPPH amount was interfered with by pigment compounds. Culture filtrate of fungi A showed the highest antioxidant activity and contained phenolic and alkaloid compounds.
The Effect of Cooking Treatment on Antioxidant Activity in Soybean Tempeh Yulianti Annisa Safitri; Agustina L. N. Aminin; Nies Suci Mulyani
Jurnal Kimia Sains dan Aplikasi Vol 25, No 11 (2022): Volume 25 Issue 11 Year 2022
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.25.11.405-411

Abstract

Indonesian people consume tempeh through various processing methods. Food processing by cooking has been reported to reduce the bioactive capacity contained in food ingredients. This study investigated the effects of food processing (frying, steaming, roasting, sautéing, and boiling) on antioxidants in soybean tempeh. The antioxidant activity of processed tempeh was measured using DPPH and reducing power methods. The results showed that the highest inhibition activity of the processed tempeh was achieved by roasting and boiling (40%). The roasting method yielded tempeh with the highest total phenolic and flavonoid content. Thus, the cooking method considerably influences the antioxidants contained in tempeh. The findings showed that tempeh processed through roasting and boiling has the highest antioxidant activity. The total phenolic and flavonoid profiles are not in line with antioxidant activity, which indicates that the contributors to antioxidant activity are not only phenolic compounds. The increase in antioxidant activity in soybean tempeh is suspected to be influenced by the non-phenolic bioactive peptide compounds found in tempeh.
Isolasi Bakteri Termofilik Sumber Air Panas Gedongsongo dengan Media Pengaya MB (Minimal Broth) dan TS (Taoge Sukrosa) serta Identifikasi Fenotip dan Genotip Dewi Nuritasari; Purbowatiningrum Ria Sarjono; Agustina L. N. Aminin
Jurnal Kimia Sains dan Aplikasi Vol 20, No 2 (2017): Volume 20 Issue 2 Year 2017
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (748.039 KB) | DOI: 10.14710/jksa.20.2.84-91

Abstract

Bakteri termofilik merupakan bakteri yang mampu bertahan hidup pada suhu tinggi di mana salah satu habitatnya adalah sumber air panas. Indonesia memiliki banyak sumber air panas yang potensial sebagai habitat bakteri termofilik. Dalam penelitian ini dilakukan isolasi bakteri termofilik sumber air panas gedongsongo dengan menggunakan pendekatan minimal media MB (Minimal Broth) dan TS (Taoge Sukosa) serta identifikasi fenotip dengan uji mikrobiologi yang meliputi pewarnaan gram dan morfologi dan identifikasi genotip dengan menggunakan urutan nukleotida gen 16S rRNA dan konstruksi pohon filogenetik dengan menggunakan program Phylip 3.68 ed. metode Distance matrix (Neighbour joining). Identifikasi enzim ekstraseluler secara kualitatif dilakukan dengan menggunakan media selektif yang meliputi uji selulase, uji a-amilase, uji protease dan uji P-galaktosidase. Dari penelitian diperoleh dua isolat tunggal bakteri termofilik yaitu isolat GS_MBan dan isolat GS_TSan. Isolat GS_MBan memiliki kemiripan dengan bakteri kelompok Anoxybacillus sp. sebesar 94-99%, berbentuk batang, bakteri gram positif, memiliki enzim ekstraseluler a-amilase, protease dan P-galaktosidase serta tidak menunjukkan potensi adanya enzim ekstraseluler selulase. Isolat GS_TSan memiliki kemiripan dengan bakteri kelompok Thermoanaerobacterium sp. sebesar 78-86%, berbentuk batang, bakteri gram negatif, memiliki enzim ekstraseluler a-amilase dan protease serta tidak menunjukkan potensi adanya enzim ekstraseluler P-galaktosidase dan selulase.
An Investigation into the Anti-Aggregation Potential of Swietenia macrophylla Triterpenoid on Bovine Serum Albumin: Docking and RMSF Bayu Fajriansyah Al-Khairi; Mukhammad Asy'ari; Agustina L. N. Aminin
Jurnal Kimia Sains dan Aplikasi Vol 27, No 12 (2024): Volume 27 Issue 12 Year 2024
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.27.12.560-568

Abstract

Protein aggregation, caused by environmental factors, can lead to neurodegenerative diseases. Hydrophobic compounds like latrepirdine are used in medical treatments like anti-Parkinson’s and Huntington’s diseases. Swietenia macrophylla contains abundant hydrophobic compounds from the triterpenoid group, but their anti-aggregation potential has not been reported. This study investigates the hydrophobic interactions and anti-aggregation potential of triterpenoid compounds, including swietenine, swietenolide, khayasin T, beta-sitosterol, and stigmasterol, against bovine serum albumin (BSA). Latrepirdine is employed as the control compound. In silico methods, molecular docking and molecular dynamics showed potential in clusters 1 and 2, with swietenine having a more stable RMSF value than latrepirdine. The study found four clusters with all ligands, with cluster 1 being the earliest protein opening area. Mahogany seed triterpenoid compounds have potential in cluster 1 (51-67%), while cluster 2 has 37-46%. In cluster 2, they have an advantage over latrepirdine (2%). Stigmasterol and beta-sitosterol are spread across the clusters. The swietenine compound has a more stable RMSF value than latrepirdine. This suggests that mahogany seed triterpenoid compounds have potential as anti-aggregation agents.
Co-Authors Alfina Sari Bambang Cahyono Bayu Fajriansyah Al-Khairi Dewi Nuritasari Mukhammad Asy'ari Nies Suci Mulyani Nur Cahyanti Purbowatiningrum Ria Sarjono Talisia Kresna Shih Yulianti Annisa Safitri