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Lantanida Journal

lantanida
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Published by Universitas Islam Negeri Ar-Raniry Banda Aceh

ISSN : 23563133 EISSN : 25489062 DOI : -

Core Subject : Science, Education, Engineering,

Chemical Engineering, Chemistry & Bioengineering Chemistry Education

Lantanida Journal is an, scientific journal open-access containing results research, literature reviews and recent news on science and technology in the areas of educational learning and learning development. This journal is formed from the initiative of Leaders Chemistry departmen, lecturers, staff, alumni and students of Chemistry Education Department UIN Ar-Raniry Banda Aceh.

Arjuna Subject : -

Articles 193 Documents

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UPAYA PENINGKATAN AKTIVITAS BELAJAR MAHASISWA PRODI PENDIDIKAN BIOLOGI MENGGUNAKAN PENDEKATAN CONTEXTUAL TEACHING AND LEARNING (CTL) PADA MATA KULIAH KIMIA DASAR Haris Munandar
Lantanida Journal Vol 6, No 1 (2018)
Publisher : UIN AR-RANIRY

General chemistry is a subject that being studied in almost every science course. The subject is closely related to the environment, so it will be very easy to learn when involve examples in everyday life. The Contextual Teaching and Learning (CTL) approach is an approach that links the learning materials with the real-world environment. This research was conducted by using a CTL approach in a general chemistry subject which is one of the compulsory subjects in Biology Education Program of Tarbiyah Faculty UIN Ar-Raniry. The aim of this study was to determine the increase of student learning activities after using the CTL approach to general chemistry lecturing activities. The design of this study used action classroom research. This study was conducted to the first semester students. The student amount was 31 students. The instrument used was an observation sheet of learning activity. The results was obtained that the activities of the student during the learning process in the first cycle reached 70% and increased to 90% in cycle II. This proves that the application of CTL approach can increase the learning studentâ€™s activity of Biology Education Studies in general chemistry courses.

PENENTUAN SUHU DAN WAKTU OPTIMUM PENYEDUHAN BATANG TEH HIJAU (Camelia Sinensis L.) TERHADAP KANDUNGAN ANTIOKSIDAN KAFEIN, TANIN DAN KATEKIN Nurul Mutmainnah; Sitti Chadijah; Muhammad Qaddafi
Lantanida Journal Vol 6, No 1 (2018)
Publisher : UIN AR-RANIRY

Tea is one of kind drink that most be preferred and consumed the tea community around the world, even most common of the community utilized tea as a healthy drink because it contains antioxidants. Antioxidants can protect cells from damage that caused by the unstable molecules. The determination of tea temperature and optimum time were aimed to know how the influence of the caffeine content of antioxidants, tannin and chatecine. In a flood expected to contain low caffeine levels with high polyphenols.The method in this research was an extraction method that analyzed by using UV-Vis a spectrophotometer. The results showed that the lowest caffeine level was at a temperature 70Â°C for 15 minutes of 0.51 %, the highest levels of tannin was at the brewing temperature 70Â°C for 5 minutes of 4.783 %, the highest cetacean levels were at the brewing temperature 85Â°C for 5 minutes of 1.14 %. So that, the optimum condition was obtained at the brewing temperature70Â°C for 5 minutes, which have antioxidant activity about 56.75%.

PENGARUH MODEL PEMBELAJARAN TWO STAY TWO STRAY TERHADAP HASIL BELAJAR SISWA PADA MATERI REAKSI OKSIDASI DAN REDUKSI DI SMA BINA BANGSA ACEH BESAR Teuku Badlisyah
Lantanida Journal Vol 6, No 1 (2018)
Publisher : UIN AR-RANIRY

In the learning process, most students have difficulties to understand the chemistry subject that delivered by the teacher. One thing that caused the difficulties of student learning was the minimum used of an appropriate learning model by the the teacher. This study was conducted to know the influence of Two Stay Two Stray learning model towards the improving of student learning result of Oxidation and Reduction Reaction Material, the student activity, and student response towards the study model of Two Stay Two Stray in SMA Bina Bangsa. The sample in this research was the students in class X of SMA Bina Bangsa. This research used the quantitative approach with a design research of Pre-Eksperimen. Data collection was done by multiple choice test, observation and student response questionnaire. The result showed that there was an increasing in student learning that taught by using learning model of Two Stay Two Stray at the test of normality with a significant level X2 count < X2 table or 1.467 < 11,1 states that the test has a normal distribution, whereas the t test with significance level of Tcount > Ttable or 8.251 > 2.13 that states there was an influence towards the students study research by using the Two Stay Two Stray model, while by n-Gain test the average students reaches the high criteria. The observation result of student activity has increased from 79.14% at the 1st meeting to become 88.33% at the 2nd meeting, the students also have a positive response towards the application of Two Stay Two Stray model study on Oxidation and Reduction Reaction material, with the student response percentage of â€œYesâ€ was 84% which means the students were interested with the Two Stay Two Stray model study.

PENGARUH SUHU DAN WAKTU EKSTRAKSI TERHADAP KAFEIN DALAM KOPI Irma Zarwinda; Dewi Sartika
Lantanida Journal Vol 6, No 2 (2018)
Publisher : UIN AR-RANIRY

This study was conducted to determine the effect of temperature and time on the acquisition of caffeine content in coffee by UV-Vis Spectrophotometry method. The study was conducted in the AKAFARMA Laboratory of YHB Banda Aceh and the Chemical Laboratory of FMIPA Unsyiah. The sample in this study is Arabica coffee powder produced by Solong Ulee Kareng which was intentionally taken. The results showed that based on temperature, the lowest caffeine content was found at 50 °C immersion temperature, which was 0.0275 mg/g and the highest level was at 100 °C soaking temperature, which was 0.181 mg/g. Whereas, based on the time when the highest caffeine content is found at 1 hour immersion at 50 °C was about 0.0675 mg/g, at 1 hour immersion at 70 °C was about 0.0862 mg/g, and at 1 hour immersion at 100 °C was about 0.181 mg/g. The temperature and extraction time have influenced on caffeine levels in Arabica coffee. The longer the time and the higher the extraction temperature, the more extracted caffeine could be found.

EVALUASI KINERJA PRAKTIKUM TITRASI ASAM BASA DENGAN TEKNIK SELF ASSESMENT MAHASISWA FKIP UNIMAL Hayatuz Zakiyah
Lantanida Journal Vol 6, No 2 (2018)
Publisher : UIN AR-RANIRY

The aim of this study was to determine the ability performance of FKIP Unimal chemical education students by the using of practicum performance appraisal with self assessment techniques as well as knowing the response of students related to practical performance assessment with self assessment techniques. Self assessment is an assessment of self competence. This study was motivated by the fact that the assessment carried out in practicum activities was still centered on the lecturer and only limited to knowledge that had not been assessed by performance and did not involve students as subjects but only objects of assessment. Type of this study is descriptive qualitative. This study was conducted to describe the findings of the use of performance assessment with self assessment techniques in chemical practicum. The study was carried out at the FKIP Unimal chemical education department for students who took 23 basic chemistry labs. The result was obtained from the instrument of performance appraisal sheets and questionnaire sheets for student responses. Data analysis on the ability of practicum performance and student response of self assessment was analyzed by using percentage techniques. Based on the results of the study showed that the ability of student practicum performance by the assessment of self assessment techniques consisted of very high was about 13.04%; high was about 47.83%; and sufficient was about 39.13%. The student responses to the using of performance appraisal with self assessment techniques showed the results that most students agreed and felt happy with the self-assessment. The conclusion of this study was the students were able to assess performance with self assessment techniques and provide a positive response related to the performance assessment with self assessment techniques.

UJI AKTIVITAS ANTIOKSIDAN DAUN BENALU KOPI (Loranthus Ferrugineus Roxb.) DENGAN METODE DPPH (1,1 – Difenil -2- Pikrilhidrazil) Muammar Yulian; Safrijal Safrijal
Lantanida Journal Vol 6, No 2 (2018)
Publisher : UIN AR-RANIRY

The study about antioxidant activity test of coffee parasite leaves (Loranthus ferrugineus Roxb.) by 1,1-diphenyl-2-pikrilhidrazyl (DPPH) method has been done. The aim of this study was to determine the content and activity of secondary metabolites, flavonoids and antioxidant, which found in the coffee parasite leaves. Dry powder of parasite coffee leaves (Loranthus ferrugineus Roxb.) as much as 0.5 kg were macerated by 2 L of ethanol solvent at room temperature for 4 x 24 hours, then mixed and filtered. Ethanol filtrate was evaporated at 30-40°C by using a rotary evaporator to obtain the crude extract of coffee parasite leaves. The results of the phytochemical screening showed positively that the extract was containing alkaloid, flavonoids, saponins, tannins and steroid compounds.The results of the antioxidant activity test by using DPPH method was obtained that the amount of antioxidant activity of the samples of ethanol extract had a very strong antioxidant activity against radical DPPH 0.05 mM, with IC50 values was obtained 6.063 ppm. Whereas, for comparison of ascorbic acid was about 3.127 ppm.

ANALYSIS OF CAFFEINE LEVELS IN KOPI KHOP BEVERAGE WITH SPECTROSCOPIC METHOD Sabarni Sabarni; Nurhayati Nurhayati
Lantanida Journal Vol 6, No 2 (2018)
Publisher : UIN AR-RANIRY

In addition of being dubbed as the city of "Serambi Mekah", Aceh is also famous as the city of "Thousand Coffee Shops". One of coffee dish that attracts consumers' is khop coffee (read: kopi khop) because it is served with a glass dish upside down. The khop coffee, a typical coffee drink from Meulaboh, West Aceh Regency, is served by reversing the glass that has been filled with coarse coffee powder on top of the pan. Therefore, it is deemed necessary to conduct a special study on the analysis of unique taste-determining compounds in khop coffee to elevate the local wisdom of the Acehnese to the scientific region. The aim of this study was to determine the concentration of caffeine compounds of khop coffee due to the modification of coffee powder diameter by using the thin layer chromatography (TLC) method and UV-Vis spectrophotometry. This study used four types of samples with diameter variations coffee, namely original, fine, medium, and coarse. The four samples were extracted with boiling hot water according to the same conditions when the bartender served it (90 °C) followed by liquid-liquid extraction using chloroform solvent. Dry extract was analyzed by using TLC followed by a UV-Vis spectrometer. The results showed that the concentrations of original, fine, medium, and coarse coffee were respectively 57.85%; 17.61%; 1.29%; and 0.83%.

IMPLEMENTASI METODE TUTOR SEBAYA DAPAT MENINGKATKAN AKTIVITAS DAN HASIL BELAJAR SISWA PADA PELAJARAN KIMIA MATERI TERMOKMIA DIKELAS XI IPA 1 SMA NEGERI 1 INDRAPURI SEMESTER GANJIL TAHUN PELAJARAN 2018/2019 Suryati Suryati
Lantanida Journal Vol 6, No 2 (2018)
Publisher : UIN AR-RANIRY

The aim of this study was to improve the learning outcomes and the student activity in the learning process of Chemistry in SMAN 1 Indrapuri of XI IPA 1 class. The solution to improve the student achievement was by the application of peer tutoring methods. This research was conducted in two cycles of 23 students. The technique of collecting data was conducted by the observation of teachers and collaborators. The KKM value of Chemistry lessons in this school is 65. Based on the results of the Cycle I was obtained around 65.21% passed the KKM with an average value of 61.3. The results of the cycle II showed the learning completeness as much as 100% with an average value of 72.4. This showed that the method of peer tutoring is successful in improving student learning outcomes. The student activity also increases with the presence of peer tutors. This showed that the use of peer tutors can improve student activity and student learning outcomes.

ANALISA HIDROKUINON DALAM KRIM DOKTER SECARA SPEKTROFOTOMETRI UV-VIS Azmalina Adriani; Rifa Safira
Lantanida Journal Vol 6, No 2 (2018)
Publisher : UIN AR-RANIRY

Cosmetics is products used to enhance the appearance of face. Various kinds of cosmetic products are increasingly emerging at this time. One kind of cosmetic is whitening cream. The whitening cream contains of an active substance used to tint black spots on the skin. The active substance which often used in cosmetics is hydroquinone. Hydroquinone is a class of hard drugs whose use must be based on a doctor's prescription. The use of hydroquinone is prohibited on cosmetic preparations that are sold freely, but may be used if under the supervision of a physician 2% (BPOM, 2007). The aim of this study was to determine the existence and level of hydroquinone in whitening cream. The results of the analysis showed that samples A, B, C, D, E, F, H and I were positive for hydroquinone with percentage of hydroquinone was about 0.000168%, 0.000319%, 0.000309%, 0.001188%, 0.00392%, 0.000058%, 0.000521%, 0.000899%, whereas the G sample was not detected.

MENINGKATKAN HASIL BELAJAR SISWA MELALUI METODE PEMBELAJARAN PROBLEM SOLVING PADA MATERI KONSEP MOL DI KELAS X-3 MAN RUKOH BANDA ACEH Rosniar Rosniar; Salawati Salawati
Lantanida Journal Vol 6, No 2 (2018)
Publisher : UIN AR-RANIRY

The aim of this study was to improve the learning achievement and activities of students through the implementation of the Problem Solving learning method in Mol Concept. This study was conducted by using two cycles of classroom action research. The subject of this research was 25 students of class X-2 MAN Rukoh Banda Aceh. The result of the implementation of learning Problem Solving method showed that there is improvement of student learning achievement from Cycle I to Cycle II. It could be seen from the results of research that showing about 64% of students had passed learning in Cycle I and about 88% in Cycle II. While the observation was conducted, the improvement of learning activities of students amounts 50%. Based the result of this study, it is can be concluded that the implementation of learning Problem Solving method can improve the learning achievement and activities of the student in Mol Concept.

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Contact Name
Adean Mayasri

Contact Email
deanmys@gmail.com

Phone
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Journal Mail Official
lantanidajournal@ar-raniry.ac.id

Editorial Address
-

Location
Kota banda aceh,

Aceh

INDONESIA