Indonesia Conference Directory

Corresponding Author
Santi Komaladini

Institutions
Indonesia Education University

Abstract
Deafness is a hearing barrier that causes people who experience it to have limited auditory feedback so that their vocabulary is limited. Deaf students at the junior level get Natural Sciences learning material about light refraction. This is used as a basis for developing their skills in communicating one event based on simple scientific observations. The vocabulary baseline of deaf students related to light refraction was measured, then used as a basis for developing their language of understanding through a simple experiment of refraction of light in a coffee solution with three types of coffee size (0.5 mm, 1 mm and 2 mm). During the experiment 5 deaf students with different IQ classifications (high, average, below average, and low) were asked to observe and write the light refraction process that occurred. The researcher observes and records all activities that occur. At the baseline session all students seemed amazed to observe the effects of the observed events. But they did not write or say anything during the experiment. In the intervention session students began to be stimulated with a number of scientific questions, the results of their ability to analyze the effects of light refraction, the ability to write reports, and their verbal abilities seemed to increase.

Keywords
Deafness, general intelligence level, light refraction, tyndall effects, coffee solution, analytical ability, writing ability, verbal ability.

Topic
Chemistry

Link: https://ifory.id/abstract/QnFcpduPmgrk

Corresponding Author
Ismarti Ismarti Ismarti

Institutions
(a) International Institute for Halal Research and Training (INHART), International Islamic University Malaysia, Jl. Gombak No. 10 Gombak, Kuala Lumpur, Malaysia
*ismarti78[at]gmail.com
(b) Physics Department, Universitas Gadjah Mada, Sekip Utara, Yogyakarta 55281, Indonesia
(c) Institute for Halal Industry and System, Sekip Utara Yogyakarta, 55281, Indonesia
(d) Fakultas Keguruan dan Ilmu Pendidikan, Universitas Riau Kepulauan, Jl. Batuaji No. 99 Batam, Kepulauan Riau, Indonesia

Abstract
Many ingredients derived from animal have been distributed widely in foods, pharmaceutical, and cosmetic formulations which may invites issues due to religious restrictions. Thus, the species-specific detection has become an important issue among Muslims, Jews, Hindus, Vegan, and vegetarian communities. Some methods such as spectroscopy, chromatography, and DNA based method have been applied for this purpose. However, these methods use sophisticated technology, therefore need high skill and cost for industrial practice. Research needs to encourage the development of simple and portable instrument. This paper highlights the potency of the Maillard reaction for species-specific detection of animal derivatives in food, especially for gelatine. Gelatine from different sources revealed different amino acids composition. It will produce various sensory of active compounds such as colour, odour, and taste when subjected to Maillard reaction, depends on reactant substances and conditions of reaction. The differences will be the key principle in species-specific detection of the sources of gelatine.

Keywords
Halal authentication, hydrolysate collagen, maillard products, sensory active compounds

Topic
Chemistry

Link: https://ifory.id/abstract/U8TM6nZYgQqw

Corresponding Author
Siti Maryam

Institutions
Universitas Pendidikan Ganesha

Abstract
Grape skin is a waste produced from the process of making wine derived from grapes. Currently the use of grape skins is still limited as a natural fertilizer, so that the presence of abundant waste. This study aims to determine the total levels of phenols and flavonoids in the skin of grapes from the waste of wine making. This research is an experimental study to determine the total content of phenols and flavonoids where this compound is an antioxidant. The power of antioxidants can be known by knowing IC50 from grape skins. The study was conducted by repeating three times from samples in the form of grape skin powder. Antioxidant activity can be determined by using the DPPH test. The results stated that the total phenol, flavonoid and IC50 levels of grape skins were 168.55 (mg / 100 gr); 61.10 (mg / 100 gr) and 1,065.19 ppm. The presence of total phenols, flavonoids and IC50 in grape skins is relatively high, so the use of grape skins from the process of making wine makes attention.

Keywords
grape skin, total phenol, flavonoid, antioxidant, IC50

Topic
Chemistry

Link: https://ifory.id/abstract/mpKQjkVwRrFD

Corresponding Author
Erdawati Bayazid

Institutions
1Depart of Chemistry, Universitas Negeri Jakarta, Jakarta
2Depart of Chemistry, Universitas Negeri Jakarta, Jakarta
3Depart of Mechanical Engineering, Universitas Negeri Jakarta

Abstract
This study aims to test ability the catalyst tubes to reduce exhaust emissions, save fuel and increase power and torque engine on vehicle. The catalyst cube named TK plus. TKplus catalyst tube filled with NiFe2O4.. NiFe2O4. created with sol gel method and calcined on temperature 6000C, characterized by XRD, FTIR, SEM EDX, BET test. Exhaust emission test results show motor vehicles equipped with TKplus can reduce CO2 emissions; between 36%-48%, and CO2 emissions fall between 7% -42%, decrease fuel consumption by 23% - 33% . Dyno test shows that in the presence of TKplus engine performance increased compared with engine without TKplus. At the revolving round of the engine at 5781 rpm or at a speed of 120 km / h, the power value increased by 5.8% and the torque value increased by 7.8% compared to the vehicles not equipped with the TKplus value.

Keywords
Nickel ferrite, catalyst tube (TKplus), exhaust emissions and dyno test

Topic
Chemistry

Link: https://ifory.id/abstract/wFKmHp76WXnq

Corresponding Author
Sri Hermawati

Institutions
Department of Chemical Education, UIN Sunan Gunung Djati Bandung, Jalan A. H. Nasution No. 105 Cibiru Bandung 0614 Indonesia
*e-mail: imeldahelsy[at]uinsgd.ac.id

Abstract
In the digital era it is now necessary to develop android-based learning media. Important buffer concept developed through android games because it includes abstract concepts, memorization and calculations. An Android-based game learning media has been developed on the buffer solution concept that contains questions about evaluating buffer material. The research method used is the stages of developing the ADDIE model (analysis, design, development, implementation, and evaluation). This research only reaches the development stage which produces an Android-based learning game product. The results of the validation carried out on 3 expert lecturers, namely material experts, media experts, and learning experts showed that the Android-based buffer solution learning game is valid with a calculated value of 0.78. The results of a limited trial analysis of 10 students as respondents showed a percentage of 94.2%. Based on the results of the validation and trial, the Android-based learning game was declared feasible to be used as a learning medium on the concept of buffer solution.

Keywords
android-based game, buffer solution

Topic
Chemistry

Link: https://ifory.id/abstract/UGpLfyNuzvQA

Corresponding Author
R.Y. Perry Burhan

Institutions
Institut Teknologi Sepuluh Nopember

Abstract
The sulfur content in diesel oil must be less than 0.5% by weight of diesel oil, because the high sulfur content will accelerate the occurrence of wear and tear on the engine cylinder walls. For this reason, desulfurization is carried out to reduce sulfur content in diesel oil. The process of desulphurisation of diesel oil causes a decrease in the lubricating power of diesel oil to the engine so that the addition of additives is needed. In this research, bioaditive substances in the form of 2-hydroxy propyl palmitate have been synthesized from the cooking oil industry fatty acids. The reaction begins with esterification of palmitic acid with BF3 / methanol to produce a methyl palmitate ester with a yield of 72.13%. Furthermore, methyl palmitate ester was esterified using propylene glycol and K2CO3 as a base to produce 2-hydroxy propyl palmitate which acts as a bioaditive with a yield of 52.90%. Structure identification is done by Gas Chromatography-Mass Spectroscopy (KG-SM) method.

Keywords
palmitic acid, methyl palmitate ester, 2-hydroxy propyl palmitate, esterification, GC-MS

Topic
Chemistry

Link: https://ifory.id/abstract/GreCfcW6Udm3

Corresponding Author
Muktiningsih Nurjayadi

Institutions
1 Department of Chemistry, Mathematics and Science Faculty, Universitas Negeri Jakarta 2Laboratory of Agro and Biomedical Industry Technology Development, Badan Pengkajian dan Penerapan Teknologi (BPPT)

Abstract
Typhoid fever is an endemic disease in Indonesia. Prevention of typhoid fever can be done by administering vaccines. It is known that one of the raw materials for vaccines is a recombinant protein. This study aims to obtain information on the optimum conditions for purification of Salmonella typhi Fim-C recombinant protein with Ni-NTA resin as vaccine raw material. The three main stages of the purification process in this study were binding, washing, and elution of S. typhi Fim-C recombinant proteins. The binding and washing variations of recombinant proteins were carried out twice, four times and six times, while the elution process was carried out at imidazole concentrations of 200 mM, 250 mM, and 300 mM. Purification with a binding process four and six times gave almost the same intensity of S. typhi Fim-C protein bands. Whereas protein was elution at an imidazole concentration of 300 mM showed higher band instability. The results of characterization using SDS-PAGE and analysis using software ImageJ gel analysis showed that the longer the incubation time and the repetition of the binding process, the more protein bound to the resin. Furthermore, the more washing processes are obtained the purer proteins. Based on the data obtained it can be concluded that the purification of the S. typhi Fim-C recombinant protein was optimum at a four-time binding process, six times washing and a 300 mM imidazole concentration. These results are expected to be the basis for recombinant protein refining on a pilot scale and industry scale in better vaccine preparation.

Keywords
Salmonella typhi, Protein purification, Recombinant Protein, Ni-NTA Resin

Topic
Chemistry

Link: https://ifory.id/abstract/xuHnTJyCe4Qz

Corresponding Author
Farid Perdana

Institutions
1. Program Studi Farmasi, Fakultas Matematika dan Ilmu Pengetahuan Alam Univesitas Garut Jl. Jati No. 42 B Tarogong Garut, Jawa Barat
*ardi[at]uniga.Ac.id

Abstract
Plant diversity in Indonesia is a very big asset especially volatile oil content derived from various types of crops in Indonesia. Essential oils or also called volatile oil or essential oil is the term used for volatile oil. Grass essential oil of vetiver (Vetiveria Zizanioides L.) Obtained by steam destilation. Gas chromatography mass spectroscopy (GC-MS) is a dynamic method for the separation and detection of comfound-volatile compounds in a mixture. The purpose of this study was to determine the quality of vetiver oil from Garut Regency from two different places using gas coromatography - mass spectroscopy (GC-MS). Based on the results of gas chromatography - mass spectroscopy, the essential oil of H. Suganda fragrant roots identified 65 components or compounds, with the most dominant compound being isokhusenic acid, while the essential oils of vetiver campoeng garoet identified 79 components or compounds, with the most dominant compounds (3E) -5-Isopropyliden-6-methyl-3,6,9-decatrien-2-one.

Keywords
Keywords: Vetiveria zizanioides L., fragrant root, essential oil.

Topic
Chemistry

Link: https://ifory.id/abstract/PbWYDL43V6uM