Porang Tuber Research Articles

Performance Evaluation of Ball Mill Type Grinding Machine for Particle Size Reduction of Porang Glucomannan Crystals

A wide gap in the price of glucomannan flour and porang tubers leads to develop a machine to process tubers into fine flour with good performance. The purpose of this research was to analyze and determine the performance of a ball mill machine on the flour yield as well as its quality. Research was conducted at PT Daud Teknik Maju Pratama from January – May 2023. Testings were carried out under two treatment factors, namely rotational speed (21.2 and 41.6 rpm) and processing time (0.5 h, 1.0 h, 1.5 h, 2 h). The test was carried out using 150 g sample for each treatment with three replications. The response variables included capacity, percentage of size reduction, material losses, engine power, and flour quality. The results showed that the optimum capacity of the ball mill machine was 12.5 kg/batch. The highest percentage of size reduction was 96.27% and the lowest material loss (3.73%) were obtained at 21.2 rpm for 0.5 h of miling process. Treatment with 41.6 rpm for 2 h produced the best flour quality with moisture content of 11.87% and fine flower yield of 63.97% passing through 100-mesh sieve. The power requirements of electric motors at 21.2 rpm and 41.6 rpm were 0.8063 kW and 0.9101 kW, respectively. The best milling capacity (1.560 g/min) was resulted at rotational speed of 62.27% CS. The ball mill machine showed superior results as compared to a disk mill which was not able to grind the glucomannan crystals up to 100-mesh size.Keywords: Ball mill, Glucomannan flour, Performance test, Porang, Refining.

Characterization of Mannanase-Producing Bacteria from Porang Tubers (Amorphophallus muelleri Blume)

Porang tubers have the potential as a source of carbon and energy for the growth of mananolytic bacteria. Mananolytic are bacteria producing mananase enzymes that are able to break down manan compounds and their derivatives. Mananase can be widely applied in the food, pharmacy, animal feed sectors, paper industries and many more. In this study, Ai isolate have been isolated and characterized, porang tubers are used as substrates for measuring the activity of mananase. The optimum temperature mananase at 40 ° C, stable at a temperature of 30 ° C-50 ° C, have optimum pH 7 and are stable at pH 4-7. Fe2+ was an activator, while Ca2+ and Mg ions were inhibitor of mananase.

Penerapan Sistem Informasi Persediaan Stok Umbi Porang Berbasis Android Sebagai Upaya Peningkatan Kinerja Pelaporan

Porang tubers are a type of food plant in which there are carbohydrates and proteins as a source of human energy. Indonesia is an agrarian country with a large agricultural area, so most of the population make a living as farmers. PT. Barokah Rizky Abadi is one of the companies engaged in agriculture, especially the sale of tubers that focuses on selling porang tubers. Stock inventory system at PT. Barokah Rizky Abadi uses manual recording of tuber stocks, namely from bookkeeping, and has not been equipped with system device information to manage the inventory of porang tubers, this is considered less effective and less accurate. From these problems, an Android-based application was made that can help in doing agency work, especially the warehousing department. The method used is a qualitative method with a Research and Development (R&D) strategy with flowcharts, DFD, and ERD so that the management of information systems is more systematic. The result of this study is the Android Application-Based Porang Tuber Stock Inventory Information System at PT. Barokah Rizky Abadi

The Effect of Porang Coating Application and Storage Time on The Characteristics of Kintamani Siamese Oranges

Kintamani Siamese Orange is one of Indonesia’s leading fruits with a distinctive taste, sweet with a slight sourness. One of the efforts to increase the shelf life of Kintamani Siamese Orange is by coating using edible materials. The edible coating can be made using renewable natural materials, one of these natural ingredients is porang starch. Porang coating is a thin layer made from glucomannan porang tubers. The application of the coating is needed to improve the appearance and maintain the quality of Kintamani Siamese citrus fruits. The motive of this examination was to decide the impact of porang coating type and storage time on the characteristics of Kintamani Siamese orange. This observation used a factorial randomized group design with two treatment factors, namely the type of porang coating (without coating, coating, and nanocoating), and the storage time of oranges (5 days, 10 days, 15 days). The best characteristics of Kintamani Siamese Orange were obtained from the treatment of porang nanocoating application with criteria of fruit weight shrinkage value of 12.47%, acidity (pH) of 4.30, total dissolved solids of 15.77ºBrix, moisture content of 94.21%, vitamin C of 78.55 and the amount of damaged fruit of 20.00% up to 5 days storage.

Evaluation of Physical Properties of Soil Determinants Glucomannan Content of Porang Tuber (Amorphophallus muelleri) in Entisols of North Lombok

Porang (Amorphophallus muelleri) is a tuber plant that contains the compound of glucomannan which has high economic value with a number of benefits, including as an industrial raw material. The glucomannan content of porang tubers has received special attention in research, including field research to determine soil properties that influence growth and content of gucomannan in porang tubers. A field survey has been carried out to determine the physical properties of soils that influence the glucomannan content of porang tubers grown in four clusters of agroforestry in the dry land of North Lombok, Eastern Indonesia. The results of the research showed that the physical properties of the soil that had a significant effect on the glucomannan content of porang tubers were soil bulk density (BD) with an R2 value of 53.15%, soil porosity with an R2 value of 60.23%, and silt particle fraction with an R2 value of 23. 47%. Thus, managing soil physical properties to facilitate the better quality of porang tubers is necessary.

EFEKTIVITAS PEMBERIAN JELLY PORANG (Amorphophallus Muelleri) KOMBINASI JAMBU BIJI (Psidium Guajava) TERHADAP KADAR KOLESTEROL LDL PADA PASIEN HIPERKOLESTEROLEMIA

Hypercholesterolemia sufferers tend to be experienced at the age of 45-59 years and over 60 years. Hypercholesterolemia is caused by several factors, namely lifestyle, diet and physical activity. Guava and Porang tubers are one alternative to lower LDL cholesterol levels. Combination guava porang jelly is a snack made from porang flour and guava which is high in fiber and vitamin C. This study is an experimental quasy research. The subjects of the study amounted to 20 people consisting of 10 treatment groups and 10 control groups. The data collected were the intake of fat, fiber and vitamin C obtained by the method of recall of food consumption 1x24 hours before and during the intervention 4 times. Examination of LDL cholesterol levels using the CHOD-PAP method. Data were tested with the Mann-Whitney test to look at the effect of treatment on LDL cholesterol levels between the control group and the intervention group. The treatment group of LDL cholesterol levels before and during the study also decreased by 19,5 mg/dl while the control group by 7,7 mg/dl. There was no significant difference in LDL cholesterol levels after the intervention. However, there was a decrease in LDL cholesterol levels decreased by 19,5 mg/dl in the treatment group and 7,7 mg/dl in the control group.

Pemanfaatan Website Profile Sebagai Sarana Informasi dan Promosi Usaha Porang Agrotanijaya Pacitan

The Agrotanijaya porang business is a porang tuber processing business located in Kebondalem Village, Tegalombo District, Pacitan Regency. Currently, the marketing process for Agrotanijaya's processed products is conventional, namely entrusting it to food stalls, depots and grocery stores. The marketing system currently implemented has the problem that Agrotanijaya products are less widely known. The solution offered is the development of a website portal as an internet media facility which can display profile information from Agrotanijaya. The activity method begins with the preliminary study, implementation and evaluation stages. Based on the evaluation results, it shows that on average over 80% of participants are able to use the features on the website independently.

Purification and separation of glucomannan from porang tuber flour (Amorphophallus muelleri) using microwave assisted extraction as an innovative gelatine substituent

Gelatine is frequently used as a food ingredient. However, Indonesia imports almost all of its gelatine, totaling 3990152 tons annually. Gelatine could be replaced with glucomannan compound which was found in porang tubers. However, it also contains calcium oxalate, which is harmful for the human body. In this study, calcium oxalate was first eliminated by the purification process using 10 % NaCl (w/w). Moreover, the microwave-assisted extraction method was used to extract the glucomannan compound by applying 300 W of microwave power with different extraction times (5, 10, 15, and 20 min) and different ethanol concentrations (60, 70, 80, and 96 %). Statistical analysis was used to optimize and identify significant parameters influencing the glucomannan concentration. The best conditions for glucomannan extraction were an extraction time of 10 min and an ethanol concentration of 80 % (v/v), resulting in a glucomannan yield of ≥96 %. Machine learning was successfully applied for data modelling using a Long Short-Term Memory block with an average R-square of 0.9772 (97.72 % accuracy) and an average MSE of 4.7719. Furthermore, physical and chemical characteristics of the extracted porang flour were accorded with SNI gelatine standards 06–3735 in 1995, which consisted of glucomannan (96.359 ± 1.164 %), calcium oxalate (0.009 ± 0.001 %), water (2.290 ± 0.986 %), ash (0.018 ± 0.002 %), fat (0.0235 ± 0.120 %), heavy metals (not identified), and pH (6.455 ± 0.191). Finally, the extracted glucomannan can be used as a potential regional substitute for gelatine production.

Growth Period of Porang (Amorphophallus onchophyllus P.) Through Tubber Cut and Inorganic Fertilizer Treatment

Porang (Amorphophallus onchophyllus) has many benefits for industry and health, because of the high content of glucomannan in its tubers. Porang needs to be developed, but the problem is getting a uniform source of tuber seeds. To get the uniform tuber seeds by dividing them. This study aims to get a uniform source of tuber seeds. This study was conducted in the field and laboratory. The experiment was arranged in a CRD. There are two factors, in seed tuber division: U1= Intact tuber, U2=Tuber cut in 2, U3=Tuber cut in 3 parts, and U4=Tubers cut into 4 parts. The second factor is fertilizer consisting of Urea, Za, and Phonska. The results of the combined treatment between tuber division and fertilizer treatment showed no significant interaction in all observed parameters. The seed tuber division treatment affects the bud break time, plant height, stem diameter, and canopy width, only at the beginning of growth. U1 gives the highest growth. The various fertilizer treatments only had a significant effect on plant height and stem diameter at 7 and 8 WAP. The treatment of splitting tuber seeds can replace intact tubers to be used as Porang tuber seeds

Physicochemical Properties of Porang Nanocoating with the Addition of Essential Oils

Porang nanocoating is a food coating that has the potential to be developed and is gaining popularity among the public to extend the shelf life of fruits and vegetables. Porang Nanocoating is a nano-sized edible coating made from porang tuber glucomannan. The addition of essential oils can improve the property of the nanocoating of people as a natural antimicrobial coating. Thyme, cinnamaldehyde and eugenol essential oils are known to have excellent antimicrobial properties. Antimicrobial ability is strongly influenced by the concentration of added essential oil. The purpose of this study was to determine the effect of the type and concentration of essential oils on the physicochemical properties of porang nanocoating. This study used a factorial completely randomized design (CRD) with two factors, namely the type of essential oil treatment including essential oils of thyme, eugenol, cinnamaldehyde. While other treatments are essential oil concentrations, namely 1%, 2%, and 3%. The results of this study indicate that the type of essential oil and its concentration affect the physicochemical properties of the porang nanocoating. The physicochemical properties of porang nanocoating based on the type of essential oil treatment gave the following average values: viscosity 16.67 m.Pa.s. – 17.50 m.Pa.s; degree of acidity (pH) range 6.29 – 6.33; color 13.50 – 13.95; transparency 89.40 – 89.56; has stable emulsion properties or there is no separation of the emulsion and in the microscopic test the oil droplets or bubbles are few While other treatments are essential oil concentrations, namely 1%, 2%, and 3%. The results of this study indicate that the type of essential oil and its concentration affect the physicochemical properties of the porang nanocoating. The physicochemical properties of porang nanocoating based on the type of essential oil treatment gave the following average values: viscosity 16.67 m.Pa.s. – 17.50 m.Pa.s; degree of acidity (pH) range 6.29 – 6.33; color 13.50 – 13.95; transparency 89.40 – 89.56; has stable emulsion properties or there is no separation of the emulsion and in the microscopic test the oil droplets or bubbles are few While other treatments are essential oil concentrations, namely 1%, 2%, and 3%. The results of this study indicate that the type of essential oil and its concentration affect the physicochemical properties of the porang nanocoating. The physicochemical properties of porang nanocoating based on the type of essential oil treatment gave the following average values: viscosity 16.67 m.Pa.s. – 17.50 m.Pa.s; degree of acidity (pH) range 6.29 – 6.33; color 13.50 – 13.95; transparency 89.40 – 89.56; has stable emulsion properties or there is no separation of the emulsion and in the microscopic test the oil droplets or bubbles are few The physicochemical properties of porang nanocoating based on the type of essential oil treatment gave the following average values: viscosity 16.67 m.Pa.s. – 17.50 m.Pa.s; degree of acidity (pH) range 6.29 – 6.33; color 13.50 – 13.95; transparency 89.40 – 89.56; has stable emulsion properties or there is no separation of the emulsion and in the microscopic test the oil droplets or bubbles are few The physicochemical properties of porang nanocoating based on the type of essential oil treatment gave the following average values: viscosity 16.67 m.Pa.s. – 17.50 m.Pa.s; degree of acidity (pH) range 6.29 – 6.33; color 13.50 – 13.95; transparency 89.40 – 89.56; has stable emulsion properties or there is no separation of the emulsion and in the microscopic test the oil droplets or bubbles are few. Treatment of essential oil concentrations gives physicochemical properties to Porang Nanocoating which has an average Viscosity value of 16.11 m.Pa.s. – 18.61 m.Pa.s; The degree of acidity (pH) ranges from 6.25 to 6.39; Color 12.80 – 14.91; Transparency 89.39 – 89.52; has stable properties or does not occur emulsion separation in the stability test and in the microscopic test has few oil droplets or bubbles.

Utilization of post-tin mining land for porang (Amorphaphillus oncophyllus) cultivation by application of cow manure compost

Tailing post-tin mining land has a sandy textured and loose structure. Those physical properties can affect the efficiency of fertilization and cause inefficiency of nutrient absorption in plants. That issue can be corrected by the application of organic material such as cow manure compost which has the potential for plant cultivation, especially for “porang” (<em>Amorphaphillus oncophyllus</em> Prain). This study aimed to examine the cultivation of porang plants in post-tin mining tailings by applying cow manure compost and to determine the best dose of cow manure compost for porang cultivation in artificial ex-tin mining land. This study used a single-group randomized design method with the treatment factor being the dose of cow manure compost consisting of five dose levels (5 t ha<strong><sup>-1</sup></strong>, 10 t ha<strong><sup>-1</sup></strong>, 15 t ha<strong><sup>-1</sup></strong>, 20 t ha<strong><sup>-1</sup></strong>, and 25 t ha<strong><sup>-1</sup></strong>). Each treatment level was replicated with five replications, and each replication consisted of five populations so the total population was 125 plants. The results showed that the application of various doses of cow manure compost to artificial post-tin mining land affected the growth and yield of porang plants. The treatment of cow manure compost at a dose of 25 t ha<strong><sup>-1</sup></strong> gave the best growth and yield of porang plants. Heavy metal (Pb) analysis on porang tubers showed that all doses of cow manure compost had a Pb content value of <0.059%, which means that cow manure compost can reduce heavy metal uptake in porang tubers. Porang planted in artificial post-tin mining land is safe for consumption because lead (Pb) content was below the threshold of Indonesia National Standard (SNI) for food.

Challenges in the Development of Porang Tuber Processing Industry with the Fishbone Diagram Approach

Challenges in the Development of Porang Tuber Processing Industry with the Fishbone Diagram Approach

The Effect of Different Drying Methods and Slice Thickness on The Quality of Porang (Amorphophallus Muelleri) Chips

Porang (Amorphophallus muelleri) is a type of tuber that has a high glucomannan content. The purpose of this study was to determine the effect of slice thickness on the quality of porang tuber chips using the Green House Effect (GHE) method by pretreatment with 0.15% sodium metabisulfite solution immersion. The slice thickness treatment was carried out at three levels, including 4 mm, 6 mm, and 8 mm, while the drying treatment was carried out with two types, which are the GHE drying method and the conventional drying method using sunlight. The results of the research on porang chips on brightness, moisture content, glucomannan content, ash content, and calcium oxalate content showed that the thickness of the slices had an effect on the quality of the chips. The thicker the slices of the porang chips, the darker the color of the porang chips. The thicker the slices of the porang chips, the higher the water content of the chips. The amount of glucomannan (%) in porang chips goes down as the slices get bigger.

Isothermic model of porang tuber (Amorphophallus muelleri B) flour

Porang tuber (Amorphophallus muelleri B) is a tuber from the Araceae family with a high glucomannan content (15-64% dry basis). Things that can be done to extend the shelf life of porang tuber flour are by doing the flouring process. This research aims to determine the isothermic curve model of Porang tuber (Amorphophallus muelleri B) flour, namely, the isothermic curve model used to estimate the equilibrium moisture content about the rh of storage. The research method used was to store samples of porang tuber flour in a desiccator with an rh interval of 17-80%. Storage was carried out until the sample’s water content reached equilibrium. Parameters of water content and determination of the best model based on the highest R2 value at the end of storage of porang tuber samples while in the desiccator. The results of the research that has been done show that a material’s water content is affected by temperature and storage rh. To determine the best model, it is shown with the model that has the highest R2 value. The Henderson model and Chung-Pfost model is the model that has the highest R2 value. The value obtained at 30 °C is 0.9556, and at 40 °C is 0,9838. The model with the highest R2 value indicates that the model is the best and most appropriate model that can be used to describe the best water absorption in porang tuber flour.

Addition of various prebiotic sources on intestinal bacteria and growth performance of broiler given microparticle protein composed-diet

The research objective was to determine how the feeding diet made of microparticle protein combined with prebiotic sources affected broilers’ intestinal bacteria and growth performance. Micronized fish meals and soybean meals were produced. Inulin, glucomannan, and soybean oligosaccharide were obtained from extracts of the dahlia tuber (DTE), porang tuber (PTE), and soybean meal (SME), respectively. A completely randomized design with four treatments (D1: 21% intact protein (control), D2: 18% microparticle protein + 1.2% DTE, D3: 18% microparticle protein + 0.3% PTE, and D4: 18% microparticle protein + 0.2% SME) and six replication (8 birds each) was assigned. Protein digestibility, H/L ratio, growth performance, lactic acid bacteria (LAB), E. coli, and other variables were exposed to ANOVA and the Duncan test with a 5% probability. Except for FCR, all parameters were substantially (p0.05) higher when prebiotic sources were included in the diet compared to the control group (D1). However, D3‘s LAB population and H/L ratio were the same compared to other treatments, and feed consumption was the same across all treatments. Supplementing a diet with microparticle protein with inulin from dahlia tubers and soy-oligosaccharide of soybean meal extracts improves growth performance, which is supported by an increase in LAB population and more easily digestible protein with a lower H/L ratio

Kajian Pemberian Beras Analog yang Disubstitusi Glukomanan Porang (A. oncophyllus) Terhadap Profil Darah Mencit yang Diinduksi Aloksan

Porang rice is made from porang tubers (Amorphopallus oncophyllus) and waxy cassava and has a high glucomannan content and has a low glycemic index (<55). Porang rice has a slightly brownish white color and has a shape like grains of rice and contains fiber which can help the digestive process in the body. Provision of porang rice against diabetic can improve blood profile. This study aims to determine the effect of giving rice from porang tubers pn the blood profile of diabetic mice. The experiment was arranged in a completely randomized design (CRD) with the treatment of observing blood profiles. The study consisted of 4 treatments with 6 replications. The data obtained was tested for uniformity using the Bartlett test and the additional data was tested with the Tuckey test. Furthermore, the data were anlyzed using variance to obtain an estimator of the varience and determine the effect of the treatment, then the data were analyzed using the BNT test at the 5% level. The results showed that the effect of giving porang rice on the blood profile of alloxan-induced mice gave values for the number of erythrocytes (7,48 million/mm3), leukocytes (5,55 thousand/mm3), hemoglobin (15,14 g/dL), hematocrit (32,28%).

The immediate effects of Porang-processed rice (Amorphophallus muelleri) on triglyceride levels in patients with type 2 diabetes mellitus and dyslipidemia

Link of Video Abstract: https://youtu.be/HSObtemRZ0M Background: Diabetes Mellitus (DM) is a major cause of death and disability worldwide. Diabetes mellitus is related to metabolic disorders in glucose and lipid levels. Porang tubers contain glucomannan, a substance with many health benefits, such as ameliorating blood glucose and lipid profiles, and has been processed as many food products, such as porang-processed rice (PR). This study investigated the immediate effects of PR on triglyceride levels compared to white rice (WR) in patients with diabetes mellitus (DM) and dyslipidemia. Methods: It was a randomized clinical study with an experimental pre-and post-test control group design held from October to November 2021 in Diponegoro National Hospital, Semarang, Indonesia. A total of 24 study subjects were selected by consecutive sampling. The inclusion criteria were (1) patients diagnosed with diabetes mellitus (DM) or who have been consuming routine oral antidiabetic drugs and (2) have signed the written informed consent. These subjects were divided into 2 groups, i.e., the treatment group (n=12) and the control group (n=12). The treatment group was given a porang rice (PR) diet of 300 grams, 3 times a day, for 5 days. The control group will consume a white rice (WR) diet for 5 days. Triglyceride levels were measured and compared between both groups before and after the treatment. Triglyceride levels were measured using venous blood sampling. All subjects were still consuming routine medications during the study. Results: There were no differences in participants' baseline demographic and clinical characteristics. At pre-treatment, there was no significant difference in triglyceride levels between the group with PR and WR (201.5 ± 102.29 vs 220.8 ± 92.08; respectively, p=0.564). At post-treatment, there was no significant difference in triglyceride levels between the group with PR and that with WR (200.0 ± 90.67 vs 224.3 ± 88.03; respectively, p=0.513). However, there was a larger decrease of triglyceride levels (Δtriglyceride) in a group with PR compared to that with WR (29.4 ± 22.81 vs 12.6 ± 7.12; p=0.016). Conclusion: There were no significant differences in the triglyceride levels before and after porang-processed rice (PR) or white rice (WR) in patients with DM and dyslipidemia. However, there was a larger decrease in triglyceride levels (Δtriglyceride) in a group with PR compared to that with WR. If confirmed by further studies, porang-processed rice might have the role of nutraceutical plants in stabilizing lipid profiles, especially triglyceride levels, in patients with DM and dyslipidemia.

The effect combination of porang tuber starch-manitol on the physical properties of bajakah root (Spatholobus littoralis Hassk) dried aquous extract lozenges

Bajakah root infuse was consumed to restore energy by Kalimantan people because it contains antioxidant, but it is not practical and efficient. Lozenges are preferred drug delivery for all ages compared to conventional tablets. Mannitol is a choice filler for lozenges because cold and sweet taste. It has hygroscopic properties, so it needs to be combined with starch. This study aimed to determine the effect of porang tuber starch in combination with mannitol on the physical properties of bajakah root dried extract lozenges. Bajakah roots were extracted using infundation and dried using a freeze dryer. The antioxidant activity of it was using the DPPH method. Porang tuber starch was extracted using water at a ratio of 1:3. Lozenges of bajakah were made with ratio of porang tuber starch-mannitol (1: 9) as filler using the dry granulation method. Physical properties were tested, including flow time, angle of repose, weight uniformity, hardness, brittleness, disintegration time, and dissolution time. The IC50 value obtained is 0.155 mg/mL. The proportion of porang tuber starch-mannitol (1: 9) resulted the physical properties namely a flow time of 4.87±0.76 seconds; angle of repose 28.91±0.99°; weight uniformity that met the requirements; hardness 10.03±2.06 Kg; friability 0.98%; disintegration time 8.34±1.89 minutes. The dissolution efficiency at 60 minutes resulted in 82.66%. It has met the requirements of the Indonesian Pharmacopoeia 5th Ed.

ANALISIS USAHATANI PORANG PADA USAHATANI ABDUL MUIS DI DESA BERNGAM KECAMATAN BINJAI KOTA, KOTA BINJAI

The porang plant is a plant that has many functions and has a lot of high starch content, especially glucomannan which is widely used by industry. This plant is very easy to grow in Indonesia, one of which is in Bergam Village, Binjai Kota District, Binjai City. This area is very strategic with existing industries in the city of Medan and has the potential for development, especially porang plants. The research objective was to analyze the income, break-even point and R/C ratio of Mr. Abdul Muis' porang (Amorphophallus oncophyllus) farming in Bergam Village, Binjai Kota District, Binjai City. The research used a survey method with a case study approach. The results showed that porang tubers in porang farming were inefficient and not recommended to be continued, while the use of frog/bulbil seeds showed that porang farming was highly recommended to be continued. The R/C ratio value of 2.32 (2.32 > 1) means that Porang Abdul Muis farming in Berngam Village is feasible. To get maximum results farmers are advised to see the right planting season.

Formulation and Antibacterial Activity of Porang (Amorphophallus muelleri Blume) Extract Gel Against Propionibacterium acne

Introduction: The increase in bacterial resistance to antibiotics provides an opportunity to obtain antibacterial compounds from natural ingredients. Porang is a plant belonging to the Araceae family that has potential against Propionibacterium acne. Aims: This study aims to determine the effectiveness of the preparation of porang tuber extract gel against Propionibacterium acne. Methods: The porang were extraction by maceration using ethanol. The extract porang were made gel with various concentration and evaluation their stability and antibacterial activity using disc diffusion method. Result: The hedonic test showed no significant differenece each of formula and stable during storage in two weeks. On the other hand, only formula F2 and F3 can inhibit of Propionibacterium acnee. Conclusion: The porang extract can made of gel and good stability. The formula F2 and F3 have antibacterial activity.