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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 8 Documents

Search results for , issue "Vol 6, No 2 (2018)" : 8 Documents clear

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.

EKSTRAK DAUN UBI JALAR UNGU SEBAGAI ANTIOKSIDAN UNTUK MEMPERLAMBAT KETENGIKAN (RANCIDITAS) PADA MINYAK KELAPA Dwi Putri Rejeki
Lantanida Journal Vol 6, No 2 (2018)
Publisher : UIN AR-RANIRY

The study of purple sweet potato leaf extract as an antioxidant to slow down rancidity in coconut oil has been conducted. The aim of this study was to prove the addition of purple sweet potato leaf extract to postpone the rancidity of coconut oil. The sample used in this study was coconut oil taken from the village of Tingkeum Lampeuneurut, Aceh Besar District, as much as 300 mL. The sample was divided into two Erlenmeyers with 150 ml in each and heated to 90°C of temperature. After that, the first Erlenmeyer was added by 30 ml of purple sweet potato leaf extract. Then, the second Erlenmeyer was chilled and left in open air for 5 days. The sample that was not added by purple sweet potato leaf extract was set as a control. Several parameters were tested in both samples, namely an iodine number, peroxide number, free fatty acid and saponification number. The results were obtained by the addition of purple sweet potato leaf extract and control oil respectively the iodine number 10.21 and 7.54 g I2/100 g samples, peroxide numbers 4.67 and 9.33 mg O2/g, free fatty acids 8.87 and 8.67%, acid numbers 24.2 and 23.5 mg KOH/g, saponification 230.49 and 234.09 mg KOH/g, esters 206.29 and 210.59 mg KOH/g. The peroxide number of oilwhich was added by the purple sweet potato leaf extract has been fulfilled the SNI for coconut oil while the control oil does not. Meanwhile the iodine numbers, acid numbers, saponification numbers, and free fatty acids in both oils do not fulfill the SNI. Based on this study was obtained that the purple sweet potato leaf extract can postpone the rancidity caused by oxidation by reducing the peroxide number. However, the purple sweet potato leaf extract was not able to inhibit the increasing of acid numbers or free fatty acids caused by hydrolysis reactions.

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Home Page

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Contact Name Adean Mayasri

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Contact Name
Adean Mayasri

Contact Email
deanmys@gmail.com

Phone
-

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

Editorial Address
-

Location
Kota banda aceh,

Aceh

INDONESIA