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Analisis Kadar Kalium (K) Pada Daun Sirih Merah (Piper crocatum Ruiz & Pav) Menggunakan Metode Spektrofotometri Andi Kurnianingsih; Supriadi Supriadi
Media Eksakta Vol 18 No 1 (2022)
Publisher : Universitas Tadulako

Red betel is a vines that can grow in the tropics. This plant is known to the public as an ornamental plant and one of the traditional medicines to cure several types of diseases. This study aims to determine the level of potassium (K) contained in red betel leaf (Piper crocatum Ruiz & Pav). Potassium contents determined using an atomic absorption spectrophotometer (AAS). The results showed that the water content of red betel leaf was 84,6%, the ash content was 2,27% and the biomass content was 13,13%. While the average level of potassium in red betel leaf is 494,175 mg/100g.

Phytochemical Screening and Antioxidant Activity Test of Red Onion (Allium ascolinicum L.) Extract Variety of Palu Valley Rimah Juwita; Daud K. Walanda; Supriadi Supriadi
Jurnal Akademika Kimia Vol. 9 No. 2 (2020)
Publisher : Universitas Tadulako

The red onion of Palu valley variety is a plant that is widely found in Palu area and regarded as a leading commodity in Central Sulawesi. The purpose of this study was to examine the secondary metabolite compounds contained in red onion (Allium ascolinicum L.) of Palu valley variety and its antioxidant activity. Antioxidant activity test in this study used DPPH (1,1-Diphenyl-2-Pikrilhidrazil) as a source of free radical, and vitamin C as the comparison. The antioxidant activity of red onion extract was analyzed using a UV-Vis spectrophotometer. The red onion tuber powder was extracted by maceration using ethanol solvent. Qualitative test of onion powder showed positive results on alkaloids, flavonoids, and tannin compounds. The samples and vitamin C were tested for antioxidant activity in various extract concentrations of 10, 30, 50, 70, and 90 ppm. The results showed that red onion extract of Palu valley variety presented an IC50 value of 38.548 ppm, and vitamin C presented an IC50 value of 22.646 ppm. Based on these values, the red onion (Allium ascolinicum L.) extract is categorized as a very strong class of antioxidant which can be used as a source of natural antioxidant.

The Effect of Giving Extract of Lannea Coromandelica (Lannea coromandelica (Houttuyn) Merrill) Leaf to Decrease the Blood Sugar Level of Mice (Mus musculus) Moh. Husaini; Supriadi Supriadi; Minarni R. Jura
Jurnal Akademika Kimia Vol. 8 No. 4 (2019)
Publisher : Universitas Tadulako

The Indian ash tree leaf (Lannea coromandelica (Houttuyn) Merrill) contains natural ingredients that can reduce blood glucose levels. This study aimed to determine the concentration of the Indian ash tree leaf extract which is the most effective to reduce blood sugar levels of mice. The leaf sample of the Indian ash tree plant was obtained from Talise sub-district, Mantikulore district, Palu, Central Sulawesi. The preparation of the extract was conducted by the maceration method. The animal testing used were 20 male mice that were induced by EDTA (ethylene diamine tetraacetic acid). Mice were divided into 5 groups as random with different treatments. Treatments I, II, and III were given an extract of 10, 20, and 40%, respectively, treatment IV was given Na-CMC as a negative control (-), and treatment V was given glibenclamide suspension as a positive control (+). The data obtained were analyzed by statistical analysis of variance analysis (ANOVA) and were continued by the Duncan test. The results showed that the Indian ash tree leaf extract can reduce the blood sugar levels of mice. The mean decreased blood glucose level at treatment I was 40.00 mg/dL, treatment II was 47.75 mg/dL, treatment III was 54.75 mg/dL, treatment IV was 1.75 mg/dL, and treatment V was 49.00 mg/dL. The conclusion of this research was that the Indian ash tree leaf extract could reduce the blood sugar level of mice with an effective concentration of 20% with α = 0.05.

Sparkol Videoscribe Usage on Colloid Material as a Media for Chemistry Education Reni Septiani; Supriadi Supriadi; Ijirana Ijirana
Jurnal Akademika Kimia Vol. 9 No. 1 (2020)
Publisher : Universitas Tadulako

This research method was research and development (R & D), which purposed to obtain the sparkol videoscribe designs of colloidal material and the validity of designs that were reviewed by experts as theoretical experts. The object of this study was sparkol videoscribe. Data collection was divided into two, namely media design data and media validity that were designed by using assessment sheets from 5 experts, 3 people were the learning media experts and 2 people were the chemical material experts. Data were analyzed descriptively to determine the justification of the validity of the research object. The results of the data analysis obtained that sparkol videoscribe design of material colloid had characteristics, namely images, moving hand animation, music, explanation of material in the form of sound and the composition of sentences incorporated in whiteboard animation. The designs were declared valid with a very good category according to experts and can be used as a chemistry education media with a score of 3.7 based on the total score of the instructional media experts and 3.45 based on the total score of the chemical material experts.

Implementation of Advance Organizer Learning Model Based on Numbered Heads Together (NHT) to Improve Learning Outcomes of Students in 11th Grade Science on Buffer at SMAN 2 Balaesang Reskiani Reskiani; Supriadi Supriadi
Jurnal Akademika Kimia Vol. 9 No. 3 (2020)
Publisher : Universitas Tadulako

The topic of buffer has connections between concepts and some prerequisite materials that students should understand to be able to facilitate this material. The lack of mastery on the material will lower the learning outcomes. This study aimed to improve students’ learning outcomes on buffer through the implementation of advance organizer learning model based on numbered heads together (NHT). This study was one group pretest-posttest design. The sample of this study was students of 11th grade Science at SMAN 2 Balaesang consisting of class XI Science 1 as the experiment class 1 with 33 students and class XI Science 2 as the experiment class 2 with 32 students. The effectiveness of the implementation of advance organizer learning model NHT-based can be seen from the average N-gain value of the experimental classes. The average N-gain value of experimental class 1 was 0.69 included in the medium category. While the average N-gain value of experimental class 2 was 0.71 included in the high category. Data analysis showed that the average value of students learning scores was greater than 65, where for the experimental class 1 was 76.36 and the experimental class 2 was 76.71. The advance organizer learning model NHT-based improved learning outcomes of students in 11th grade Science on buffer at SMAN 2 Balaesang.

Flower Extracts of Cage Plants (Canavalia virosa) as an Indicator of Acid Base Andi M. Rendi; Supriadi Supriadi; Suherman Suherman
Jurnal Akademika Kimia Vol. 9 No. 4 (2020)
Publisher : Universitas Tadulako

Cage plants (Canavalia virosa) are classified as nuts. This study aims to prove the flowers of the cage plants as acid-base indicators and determine the type of acid-base titration that is suitable for indicators of cage plants. The flowers of the cage plants were macerated with ethanol. Extras were tested as indicators in acid-base solutions, buffer solutions, and compared with phenolphthalein and methyl orange for acid-base titration, namely: strong acid with a strong base, a weak acid with a strong base, and weak base with strong acid. The results obtained in this study, namely: flower extracts of cage plants in strong red acid, in weak acid pink, in strong green bases, and weak bases in light green. In a buffer solution of pH 1 to pH 11, the flower extract of the cage plants gives 4 color groups, namely: a buffer solution with pH 1 colored red, pH 3 colored pink, pH 5 to pH 9 being light green, and pH 11 being dark blue. Cage plant flower extract can be used as an indicator of acid-base, cage plant flower extract can be used on strong-base strong acid titration, strong weak-acid base, and weak-strong base acid titration.

Analysis of Student’s Creative Thinking Ability on Colloid Material Siti Arma; Supriadi Supriadi
Jurnal Akademika Kimia Vol. 11 No. 1 (2022)
Publisher : Universitas Tadulako

This study aimed to describe students' creative thinking skills in Colloid material in class XI SMA Negeri 7 Palu. The type of this research was descriptive quantitative. The research sample consisted of 30 students. The data collected were in the form of test results for the ability to think creatively, which were obtained through giving essay questions as many as five items that expert validators had validated. The results of every item were on average 74.4% of fluency, while flexibility, elaboration, and originality, respectively, were 75.83%, 53.76%, 61.66%, and 47.5%. Based on the analysis of the four indicators above, it can be found that the students' creative thinking ability on colloid material in class XI SMA Negeri 7 Palu was in the medium category. Students need to be accustomed to working on questions that can require them to think creatively during learning to develop their ability in creative thinking and connect theory with everyday life.

The Ability of Chemistry Problem Solving of Senior High School Students in Palu Sulawesi Tengah Ijirana Ijirana; Sitti Aminah; Supriadi Supriadi; Detris Poba
Jurnal Akademika Kimia Vol. 10 No. 2 (2021)
Publisher : Universitas Tadulako

The research is purposed to describe the problem-solving ability of the Senior High School XI grader students in Palu city. The measurement of the problem-solving ability could be determined by solving the exercises of Hydrocarbon and Thermochemistry topics using the Polya’s sequences; consisting of understanding the problem, devising, doing the plan, and evaluating. The ability of students’ problem solving is classified well in every sequence in case of the number of high category students is 60%. The samples are 240 of 507 XI grade students learning chemistry in SMAN 3 and SMA Madani Terpadu in Palu City. The data of problem-solving is determined by providing a test in the form of a validated assay. The result shows the average of XI graders in Palu City only capable of solving the problem without understanding, devising, and evaluating while solving hydrocarbon topics. The ability is not even possessed by students in Thermochemistry. It implies that senior high school students in Palu could not represent the problem in the form of figure, symbol, statement, and mathematics statement or have not been able to devise the problem solving and correlate the obtained result with the related theory or concept. Therefore, the students should be trained to solve the problem in learning by application the problem-solving sequences.

Analysis of Calcium (Ca) Levels in Milkfish’s (Chanos chanos) Bone Using Atomic Absorption Spectrophotometry (AAS) Lia K. Dewi; Supriadi Supriadi; Siti Aminah
Jurnal Akademika Kimia Vol. 10 No. 1 (2021)
Publisher : Universitas Tadulako

Milkfish (Chanos chanos) is famous for Indonesian and has high economic value. Milkfish bone can be processed into flour. A milkfish bone sample was obtained from the Sioyong Market in Dampelas, Donggala. The purpose of this study was to determine the calcium (Ca) levels in milkfish bone using atomic absorption spectrophotometry (AAS). The sample preparation method used dry destruction with sample ignition. The results showed that the average calcium levels in the flesh and head bones of milkfish aged two months were 0.052 ± 0.0007% and 0.132 ± 0.0056%, while those at aged five months milkfish were 0.197 ± 0.0014% and 0.138 ± 0 0007%, respectively. This study concludes that the older the age of milkfish is, the higher the calcium levels in the bones.

Analysis of Flavonoid Levels in Tin (Ficus carica Linn) Fruit Rahmasita Rahmasita; Siti Nuryanti; Supriadi Supriadi
Jurnal Akademika Kimia Vol. 10 No. 1 (2021)
Publisher : Universitas Tadulako

Tin fruit is an essential source of bioactive components such as phenol, benzaldehyde, and flavonoids due to the antioxidant properties. Analysis of flavonoid levels on Tin (Ficus carica Linn) fruit was carried out using Uv-Vis spectrophotometry. This study aimed to determine the total flavonoid levels found in Tin (Ficus carica Linn) fruit with a variety of samples of raw, half-ripe, and riped. Extraction of chemical content in Tin (Ficus carica Linn) was carried out by maceration method with ethanol 70%. Total flavonoid levels of the extracts sample were determined through absorption measurements at a wavelength of 520 nm and 700 nm. The results showed that total flavonoid levels in raw, half-ripe, and ripe fruits are 5.778 × 103, 3.056 × 103, and 3.707 × 103 mg/L, respectively, or equivalent to 17334 × 103, 9.168 × 103, and 11.121 × 103 mg/100g, respectively.

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