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All Journal Journal of the Medical Sciences (Berkala Ilmu Kedokteran) JPBIO (Jurnal Pendidikan Biologi) YARSI Medical Journal Health and Medical Journal Jurnal MedScientiae Jurnal Bioteknologi & Biosains Indonesia (JBBI) Cermin Dunia Kedokteran Jurnal Bioteknologi & Biosains Indonesia
Kris Herawan Timotius
Krida Wacana Christian University, Jalan Arjuna Utara 6, Jakarta 11510, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education Environmental Science Health Professions Immunology & microbiology Medicine & Pharmacology Neuroscience Nursing Public Health

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Antioxidant Activity of Methanol Extract from Several Indonesian Green Teas simamora, adelina; Steven, Michael; Santoso, Adit Widodo; Rumiati, Flora; Timotius, Kris Herawan
Jurnal Kedokteran YARSI Vol 26, No 1 (2018): JANUARI - APRIL 2018
Publisher : Lembaga Penelitian Universitas YARSI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (515.654 KB) | DOI: 10.33476/jky.v26i1.460

Abstract

As a common beverage, green tea is supposed to have beneficial health effect, such as antioxidant. At present, there are many green teas available in the market in Jakarta. Their quality, in their antioxidant activity, should be proved. This study aimed to investigate the antioxidant activity of extracts of green tea products commercially available in Jakarta. Four green tea samples from different factories (coded as A, B, C, and D) were selected and macerated using methanol. DPPH radical scavenging activity, reducing power ability and total antioxidant capacity were used to measure the antioxidant activity. The total phenolic content (TPC) was also determined. The studied green teas had varied TPC from 23.80  to  84.03 mG GAE/g extract, ranked as B > D > A > C. All samples exhibited various but strong antioxidant activity by DPPH assay, even better than standards ascorbic acid and butylated hydroxytoluene (BHT). However, all extracts showed similar activities in their reducing power ability and total antioxidant capacity, with activities less than standards. These findings confirm that the quality of the Indonesian commercial green teas were heterogeneous both in TPC or DPPH scavenging capacity. But, there is an indication that they are good as an antioxidant containing beverage. 
Low level of plasma VEGF-A and C allele of -2578*C/A polymorphism in the VEGF-A gene are risk factors of diabetic foot ulcer in Javanese ethnic Rahayu, Ika; Sinorita, Hemi; Timotius, Kris Herawan; Sadewa, Ahmad Hamim
Journal of the Medical Sciences (Berkala Ilmu Kedokteran) Vol 53, No 2 (2021)
Publisher : Journal of the Medical Sciences (Berkala Ilmu Kedokteran)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (337.404 KB) | DOI: 10.19106/JMedSci005302202106

Abstract

Diabetes mellitus (DM) is caused by abnormal insulin secretion, impairedinsulin action, or both. Approximately 12-25% of type 2 diabetes mellitus(T2DM) patients will develop diabetic foot ulcers (DFU). Vascular endothelialgrowth factor (VEGF) is a group of platelet-derived growth factors (PDGF)which have a potential role in angiogenesis. Low levels of VEGF-A can causeinsufficient angiogenesis leading to wound healing inhibition. The 2578*C/Apolymorphism of VEGF-A gene has been reported as a candidate markerfor the DFU development. However, the variant role in the development ofDFU in Javanese ethnic needs to be clarified. This study was conducted tocompare VEGF-A levels and the -2578*C/A polymorphism of the VEGF geneamong diabetic patients with and without DFU in Javanese ethnic. In thiscase-control study, the T2DM individuals with DFU as case group (n=19) andwithout DFU as control group (n=41) were recruited. The VEGF-A levelsweredetermined by ELISA. The ARMS-PCR technique was applied to investigate thepresence of -2578*C/A polymorphism of the VEGF gene. Data were analyzedwith independent t, Mann-Whitney, Chi-square, and Kruskal-Wallis tests withsignificance level of p<0.05. The median of plasma VEGF-A level was significantlydifferent between case and control groups (p=0.001). The genotype frequencyof -2578*C/A polymorphism of VEGF gene was no difference between case andcontrol groups. However, individuals with C allele have a higher risk factor todevelop DFU than A allele (CC+CA vs AA;p=0.042; OR=2.5). The plasma VEGF-Alevels were lower in T2DM subjects with DFU than those without DFU. Inconclusion,individuals with C allele of -2578*C/A polymorphism of VEGF geneare more susceptible to have DFU than individuals with A allele in Javaneseethnic with T2DM.
Isolasi Bakteri Methicillin Resistant Staphylococcus aureus pada Gagang Pintu Gedung Kampus X di Jakarta Pasaribu, Donna Mesina Rosadini; Kelvin, Kelvin; Timotius, Kris Herawan
Jurnal MedScientiae Vol. 3 No. 1 (2024): April
Publisher : Universitas Kristen Krida Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36452/JMedScientiae.v3i1.3062

Abstract

Bacteria are one of the component parts in every ecosystem. Staphylococcus aureus (S. aureus) is a normal surface flora of the human body, as a temporary contaminant on inanimate objects such as clothing, cutlery and doorknobs, but also a oportunistic even pathogen on the host. The mutated strain of S. aureus has a cross-resistant strain against all antibiotics of the Beta Lactam, Methicillin, Oxacillin and Flucloxacillin groups, called Methicillin Resistant Staphylococcus aureus (MRSA). This research is needed because MRSA is a strain of bacteria that can be everywhere, especially in public facilities, such as doorknobs, which can be a place of transmission (transfer) of bacteria from one host to another. The samples in this study were taken by swabbing from the door handle in building X, Jakarta. A total of 62 samples were then cultured on Mannitol Salt Agar (MSA) media, the growing isolate was tested by Gram staining, catalase test, and mannitol. Isolate suspected of Staphylococcus aureus, ascertained whether MRSA strain using 30 μg antibiotic C efoxitin (fox) disc. The results of this study showed that 58 (87%) isolates were Staphylococcus aureus and sensitive to C efoxitin antibiotics, 8 (13%) isolates, mnitol test negative, sensitive to Ceroxitin antibiotics. The study concluded that the bacterial isolate found was Staphylococcus aureus sensitive methicillin (MSSA), no MRSA was found.
Evaluasi Mikrovaskuler dengan Near Infrared Spectroscopy pada Pasien Kaki Diabetes Kartika, Ronald Winardi; Timotius, Kris Herawan
Jurnal MedScientiae Vol. 3 No. 1 (2024): April
Publisher : Universitas Kristen Krida Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36452/JMedScientiae.v3i1.3074

Abstract

Peripheral Arterial Disease (PAP) requires good evaluation to reduce amputation rate. The aim of this study is to assess non-invasive detection methods in evaluating microvascular conditions in PAP. The potential use of Near Infrared Spectroscopy (NIRS) in identifying disorders in patients with PAP, either with or without DM, was also assessed. A systematic literature search was conducted through PUBMED until October 2023. Based on the literature review, it can be concluded that the use of NIRS in evaluating microvascular status in PAP is a non-invasive testing method that has expanded its role. Evaluation with NIRS provides metrics such as recovery time, deoxygenation, oxygen consumption (VO2), tissue oxygen saturation (StO2), total haemoglobin (HbT), and oxyhemoglobin area under the curve (O2 HbAUC). NIRS also has the potential to assist multidisciplinary teams in treating high-risk patients, especially in diabetic patients whose symptoms are compensated by peripheral neuropathy. This study shows that NIRS can be used as a useful tool in evaluating microvascular status in PAP, by providing important information that can be used to optimise patient care and prevent more serious complications. It is concluded that NIRS can be used as a tool to evaluate the effectiveness of treatment and prevent worsening of the condition of patients with PAP in diabetic foot.
Potensi Sekretom Mesenchymal Stem Cell pada Terapi Regeratif Penyakit Paru Fibrosis Kartika, Ronald Winardi; Timotius, Kris Herawan
Jurnal MedScientiae Vol. 3 No. 2 (2024): Agustus
Publisher : Universitas Kristen Krida Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36452/JMedScientiae.v3i2.3142

Abstract

Fibrosis lung diseases such as chronic obstructive pulmonary disease, acute lung injury and post-Covid 19 fibrosis lung disease are considered as major health problems in the last decade. Cellular therapy with Mesenchymal Stem Cells (MSC) offers a novel therapeutic approach for fibrosis lung disease associated with anti-inflammatory, immunomodulatory, regenerative, pro-angiogenic and anti-fibrotic properties. Such therapeutic effects may be attributed to the MSC-secretome, which is made of free soluble proteins and extracellular vesicles (EVs). This review summarises some recent literature findings related to the efficacy and safety of MSC-derived products in pre-clinical models of lung diseases, demonstrating the biologically active substances contained in the MSC-secretome and its mechanisms involved in tissue regeneration. A perspective view is given on the secretome being a high-quality, safe and effective medicinal product,  
MICROBIAL CONTAMINATION AND BIOACTIVE COMPOUNDS OF JAMU BERAS KENCUR Gunardi, Wani Devita; Teiseran, Virginia Marsella; Timotius, Kris Herawan
Jurnal Bioteknologi & Biosains Indonesia (JBBI) Vol. 11 No. 2 (2024)
Publisher : BRIN - Badan Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jbbi.2024.5966

Abstract

Background: Jamu Beras Kencur (JBK) is recognized as an herbal medicine, containing two main components: the rhizome of Kaempferia galanga and rice. While previous research has identified bioactive compounds in galangal rhizomes, such as Ethyl p-Methoxycinnamate (EPMC), Ethyl-cinnamate, and Kaempferol, there are few reports on polar or aqueous compounds in JBK. LC-MS/MS and GC-MS enable comprehensive analysis of bioactive compounds, with LC-MS/MS detecting non-volatile, polar, and thermally sensitive compounds like flavonoids and glycosides, while GC-MS analyzes volatile and semi-volatile compounds, such as terpenoids, providing precise separation and identification. Therefore, this study were to know the amount and the growth of contaminant bacteria, yeast and mold; to determine the main bioactive compounds in JBK; and to determine the bioactive compound in aqueous and ethanolic extracts of rhizome that analysed with LC-MS/MS and GC-MS. Methode: JBK samples were sourced from local producers in West Jakarta, freshly prepared, and immediately analyzed for microbial contamination and bioactive compounds. Result: The analysis revealed microbial contamination in JBK, including Escherichia coli, Staphylococcus aureus, Coliform, yeast, and mold. Additionally, three novel flavonoid glycosides were identified: Chrysoeriol-4'-O-β-D-glucopyranoside, Patuletin-7-O-[6′′-(2-methylbutyryl)]-glucoside, and Acacetin-7-galactoside. Conclusion: Therefore, from the pharmacological perspective, JBK has the potentials as a healthy herbal drink. However, further preclinical and clinical studies are essential to validate its safety and efficacy for clinical use, which could pave the way for its integration into mainstream healthcare as a natural therapeutic option.
Pemberian Dosis Tinggi D-galactose Jangka Pendek secara Intraperitoneal untuk Menginduksi Proses Aging pada Tikus Jantan Kartika, Ronald Winardi; Sidharta, Veronika Maria; Djuartina, Tena; Timotius, Kris Herawan; Sartika, Chyntia Retna; Rika, Ignatio
Health and Medical Journal Vol 5, No 3 (2023): HEME September 2023
Publisher : Universitas Baiturrahmah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33854/heme.v5i3.1370

Abstract

Pendahuluan: Injeksi D-galaktosa (D-gal.i.p.) intraperitoneal yang dapat mempercepat penuaan telah digunakan untuk mengembangkan model penuaan. Penelitian sebelumnya menggunakan D-galaktosa jangka panjang selama 4 minggu untuk menginduksi penuaan pada mencit menimbulkan kesulitan waktu dan biaya pengobatan. Para peneliti sedang mencoba mencari tahu apakah pemberian D-gal dosis tinggi dalam jangka pendek. aku p. pada tikus mampu menginduksi tanda-tanda signifikan yang mirip dengan penuaan alami, yaitu peningkatan stres oksidatif dan myostatin. Tujuan dari penelitian ini adalah untuk mengetahui jalur penuaan otot pada tikus akibat pemberian D-galaktosa dosis tinggi dalam waktu singkat. Metode: Rancangan penelitian studi eksperimen, in vivo, dilakukan di laboratorium terpadu FKIK Universitas Katolik Atma Jaya Jakarta menggunakan 22 ekor tikus Sprague Dawley, jantan, umur 6-12 minggu, berat 200-350 gram. Sebelas ekor tikus diinduksi intraperitoneal (G-ip) D-galaktosa 300 mg/kg/hari selama 7 hari. 11 ekor tikus sisanya diinduksi dengan NaCl 0,9% i.p (N-ip). Pada penelitian ini pengukuran berat badan, lingkar gastrocnemius, CRP dan kadar myostatin blood elisa dibandingkan antara hari ke 7 dan hari ke 0 untuk melihat efek sistemik injeksi D. Galaktosa. Data dianalisis menggunakan SPSS versi 20. Hasil: Pemberian D-gal jangka pendek. i.p secara signifikan meningkatkan peradangan sistemik. dan tingkat myostatin. Pada kelompok perlakuan terjadi peningkatan aktivitas superoksida dismutase meskipun lebih rendah dibandingkan NaCl 0,9% i.p. kelompok. Kesimpulan: Dosis Tinggi Waktu singkat D-gal. injeksi mungkin membuat penuaan alami yang dapat berkembang pada tikus paling cepat satu minggu.
The Phytochemical constituents and biological activities of sungkai (Peronema canescens Jack) leaves hydroethanolic extracts Rahayu, Ika; Sudrajat, Susana Elya; Sancnia, Sancnia; Puspasari, Monica; Timotius, Kris Herawan
JPBIO (Jurnal Pendidikan Biologi) Vol 9, No 1 (2024): April 2024
Publisher : STKIP Persada Khatulistiwa Sintang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31932/jpbio.v9i1.3398

Abstract

Peronema canescens, Jack commonly known as "sungkai," has been traditionally used as a herbal medicine for various health conditions. This study aimed to explore the bioactive compound of the P. canescens leaves hydroethanolic extract, along with assessing its antioxidant and antimutagenic properties. Liquid chromatography-mass spectrometry (LC-MS) was utilized for phytochemical analysis of the hydroethanolic extracts, while antioxidant activity was evaluated through the DPPH radical scavenging method. Quantification of total phenolic and flavonoid content was achieved via colorimetric analysis. Furthermore, the DNA protection activity was assessed using plasmid pBR322 subjected to free radical treatment. The primary bioactive compounds identified in the P. canescens hydroethanolic extracts belonged to the alkaloid and flavonoid groups. The antioxidant activity of P.canescens leaves hydroethanolic extracts showed an IC50 value of 0.02±0.00 µg/mL. Additionally, the total flavonoid and phenolic content were measured at 33,769±3,626 µg QE/mL and 638,924±6,683 µg GAE/mL, respectively. Notably, P.canescens exhibited significant potential in mitigating DNA damage. In conclusion, the P. canescens leaves hydroethanolic extracts demonstrate promising attributes as a herbal medicine, highlighting notable antioxidant and antimutagenic effects.
Penggunaan Near Infrared Spectroscopy untuk Evaluasi Kaki Diabetes: Analisis Kartika, Ronald; Timotius, Kris Herawan
Cermin Dunia Kedokteran Vol 52 No 2 (2025): Pediatri
Publisher : PT Kalbe Farma Tbk.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55175/cdk.v52i2.1208

Abstract

Introduction: Diabetic foot disease requires serious management due to the risk of amputation. Microvascular abnormalities increase the risk of amputation by impairing blood flow, slowing wound healing, and increasing the risk of infection. Methods: Systematic review of the clinical potential of near infrared spectroscopy (NIRS) for identification of peripheral arterial disease (PAD) concomitant with diabetic (DM) microangiopathy. Systematic literature search through PubMed BMC Central published in 2018-April 2024. Discussion: NIRS can provide clues such as prediction of recovery time, deoxygenation of peripheral blood, oxygen consumption (VO2), tissue oxygen saturation (StO2), total hemoglobin (HbT), and oxyhemoglobin area under the curve (O2 HbAUC). NIRS has the potential to help predict wound healing especially in diabetic patients with symptoms masked by peripheral neuropathy. Conclusion: NIRS can assess the effectiveness of treatment and prevent worsening PAD in diabetic foot.
Potensi Sekretom Mesenchymal Stem Cell untuk Terapi Regeratif Penyakit Paru Fibrosis Kartika, Ronald; Timotius, Kris Herawan
Cermin Dunia Kedokteran Vol 51 No 11 (2024): Kedokteran Umum
Publisher : PT Kalbe Farma Tbk.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55175/cdk.v51i11.1270

Abstract

Mesenchymal stem cells (MSC) associated with anti-inflammatory, immunomodulatory, regenerative, pro-angiogenic, and anti-fibrotic properties offers a novel therapeutic approach for fibrosis lung disease. Such therapeutic effects may be attributed to the MSC-secretome, made from free soluble proteins and extracellular vesicles (EVs). This review summarizes some literature findings related to the efficacy and safety of MSC-derived products in pre-clinical models of lung diseases, demonstrating the biologically active substances contained in the MSC-secretome and its mechanisms involved in tissue regeneration. A perspective view is given on the secretome as a high-quality, safe, and effectivemedicinal product.
Co-Authors Ahmad Hamim Sadewa Donna Mesina Rosadini Pasaribu Flora Rumiati Hemi Sinorita Ignatio R. Haryono Ika Rahayu Kartika, Ronald Kartika, Ronald Winardi Kelvin Kelvin Margaretha Puspasari, Monica Sancnia, Sancnia Santoso, Adit Widodo Sartika, Chyntia Retna Simamora, Adelina Steven, Michael Sudrajat, Susana Elya Teiseran, Virginia Marsella Tena Djuartina, Tena Veronika Maria Sidharta Wani Devita Gunardi