The people of Timor Island only know garlic as a kitchen spice. This research provides new knowledge of the benefits of garlic in the health sector, especially as an inhibitor of free radical that can trigger various degenerative diseases. The aims of this research were to identify secondary metabolites contained in the ethanolic extract of garlic (Allium sativum L.) from Timor Island and to determine its effectiveness in inhibiting free radicals. The method used to test secondary metabolites was phytochemical screening using color reagents. Testing the effectiveness of free radical inhibitors from garlic ethanol extract from Timor Island was carried out in 2 stages: 1.) Determination of DPPH maximum wavelength (λ) and 2.) Measurement of antioxidant activity using DPPH method. The results showed that the ethanolic extract of garlic from Timor Island contained secondary metabolites of flavonoids, phenols and terpenoids. It was also very effective in inhibiting free radicals, with the acquisition of IC50 values <50 ppm which was equal to 9.729 ppm. This research gives some information that can be used for the pharmacological ingredients, i.e. as a natural medicine that safe for the body to be consumed by the people of Timor Island. Moreover that also can impact on demand of garlic in the market. This has a very positive impact on improving the economy of garlic farmers on Timor Island.
The dug well water quality in community settlements needs assessment to ensure its quality. The water has to meet the required physical, chemical, and bacteriological standards. This initial research aimed to determine the dug well water quality in Kampung Ujung, Komodo District, Labuan Bajo City, WestManggarai Regency in September 2019. The research method was used survey and laboratory. The two dug well was taken used a purposive sampling technique. The test parameters include temperature, turbidity, pH, smell, Total Suspended Solid (TSS), sulfate, Total Dissolved Solid (TDS), nitrate, nitrite, Total Hardness, Dissolved Oxygen (DO), nitrogen ammonia, total coliforms, and Escherichia coli. The analysis physically, chemically, and biologically of two dug well water samples were had done examined. The result showed that the parameters of TDS, nitrate, nitrite, E. coli, and DO exceed the Class I Water Quality Standard. The research concluded that the quality of both dug well water in the Kampung Ujung Labuan Bajo area was not suitable for use as material raw drinking water. Furthermore, the government should provide other water sources such as the addition of storage tanks for raw water, so that people do not entirely depend on dug well water.
The purpose of this research is to develop an acid-base device that integrates ARCS motivation strategies in problem-solving learning models of scientific attitudes and critical thinking skills of students. The development of this device uses a 4-D model, but in this study, due to the limited time, the development of the device only reached the development stage and was tested on Biology Education Study Program students in semester 2 with a one-group pretest-posttest design. Data collection techniques used are validation, tests, and questionnaires. Data were analyzed using SPSS and the Likert scale. The results showed the validity of the Semester Lesson Plan obtained a rcount of 0.690, valid category. Student Worksheet obtained rcount value of 0.748 valid categories. Learning Outcomes Test obtained, rcount of 0.701, with a valid category. The percentage of Lesson Plan implementation is on a scale of 4 with a good category. The results of the N-Gain Score test in the productive class is 78.58% effective category while the N-Gain Score in the trial class is 70.14% and is included in the quite effective category. The data shows that learning using ARCS motivation strategies in problem-solving learning models can improve student learning outcomes.
Solution material is one of the materials that requires a student's level of understanding at the critical thinking level. Critical thinking skills train students to learn to find and solve problems using scientific methods based on real experiences encountered and experienced directly. To be able to find the concept of knowledge based on existing realities, an appropriate learning model is needed, namely a problem-based learning model. This study aims to determine students' critical thinking skills. The type and design of this research is development research with a nonequivalent control group design. The samples of this research were students of semester 2, Biology Education Study Program, University of Flores. This research was conducted from April-June 2020. Data were collected using the critical thinking ability test technique of students in the chemical solution subject, followed by processing and analyzing data using the prerequisite analysis test in the form of normality test, homogeneity test, and t-test. The data analysis shows the significance value of the normality and homogeneity test, namely α> 0.05, while for the t-test α <0.05. From these results prove that problem-based learning can improve students' critical thinking skills in chemistry subject matter solution
The purpose of the study was to determine the content of secondary metabolites and the effectiveness of garlic (Allium sativum L.) ethanol extract from Timor island which has the potential to inhibit free radicals. The method used for testing secondary metabolites is phytochemical screening using color reagents. The effectiveness of free radical inhibitors from the ethanol extract of garlic (Allium sativum L.) from Timor island was carried out in two steps are: 1.) Determination of DPPH wavelength (λ) maximum and 2.) Measurement of antioxidant activity using the DPPH method. The results showed the ethanol extract of garlic (Allium sativum L.) from Timor Island contained secondary metabolites of flavonoids, phenols, and terpenoids. The ethanol extract of garlic (Allium sativum L.) from Timor Island also has strongest effectiveness in inhibiting free radicals, with the acquisition of IC50 values <50 ppm which is equal to 9,729 ppm
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