Article Per Year (5 Year)
p-Index From 2020 - 2025
0.23
P-Index
This Author published in this journals
All Journal Jurnal Riset Kimia JURNAL GALUNG TROPIKA
D Darwis
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Chemistry

Published : 3 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 3 Documents
Search

 1 
STUDI KINETIKA DEHIDRASI RISINOLEAT DARI MINYAK JARAK Sitorus, M; Ibrahim, S; Nurdin, H; Darwis, D
Jurnal Riset Kimia Vol 3, No 2 (2010): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v3i2.42

Abstract

 ABSTRACT Dehydration of ricinoleic of castor oil into mixed of linoleic acid (LA) and conjugated linoleic acid (CLA) named DCO (dehydrated Castor Oil) was conducted by using P2O5 at temperature 125°C and 175°C were held time variety at 1, 2, 3 and 4 hour. Dehydration was maintained under reduced pressure 50 to 70 mmHg, gentle bubbling with Nitrogen , magnetically stirred between 800 to 1000 rpm and 0.1 g Zn powder as antipolymerization agent. The concentration changes of the ricinoleic and DCO followed by contrentation GC. The elucidation of ricinoleic, LA and CLA were analyzed by GC-MS. The result showed that reaction was first order with rate constant (k) was 1.0 × 10-2 h-1 at 125°C and 0.9631 h-1 at 175°C and energy of activation (Ea) was 191.152 kJmol-1and Keywords: Dehydration, Kinetic, Ricinoleic, LA and CLA. 
STUDI KINETIKA DEHIDRASI RISINOLEAT DARI MINYAK JARAK M Sitorus; S Ibrahim; H Nurdin; D Darwis
Jurnal Riset Kimia Vol. 3 No. 2 (2010): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v3i2.42

Abstract

 ABSTRACT Dehydration of ricinoleic of castor oil into mixed of linoleic acid (LA) and conjugated linoleic acid (CLA) named DCO (dehydrated Castor Oil) was conducted by using P2O5 at temperature 125°C and 175°C were held time variety at 1, 2, 3 and 4 hour. Dehydration was maintained under reduced pressure 50 to 70 mmHg, gentle bubbling with Nitrogen , magnetically stirred between 800 to 1000 rpm and 0.1 g Zn powder as antipolymerization agent. The concentration changes of the ricinoleic and DCO followed by contrentation GC. The elucidation of ricinoleic, LA and CLA were analyzed by GC-MS. The result showed that reaction was first order with rate constant (k) was 1.0 × 10-2 h-1 at 125°C and 0.9631 h-1 at 175°C and energy of activation (Ea) was 191.152 kJmol-1and Keywords: Dehydration, Kinetic, Ricinoleic, LA and CLA. 
Efektivitas Penggunaan Herbal Terhadap Performa Produksi Ayam Ras Petelur: Efektivitas Penggunaan Herbal terhadap Performa Produksi Ayam Ras Petelur Suryani, Lili; Darwis, D; Nurcaya, N
Jurnal Galung Tropika Vol 12 No 1 (2023)
Publisher : Fakultas Pertanian, Peternakan dan Perikanan Universitas Muhammadiyah Parepare

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31850/jgt.v12i1.1055

Abstract

Demand for poultry products continues to increase. The quality of livestock commodities is obtained by providing good feed (good feeding practices). Feed is the most significant component of production costs, namely 60-70%. Utilizing the potential of local feed ingredients can reduce feed costs and improve livestock health. Herbal administration improves livestock performance through bioactive substances. Herbs used as feed ingredients are turmeric, ginger, and indigoferas leaf meal. Herbal plants function as natural antibiotics, antivirals, and antimicrobials. This study aims to determine the effectiveness of using herbs in feed on production performance. The research location was in Mappesangka Village, Ponre District, Bone Regency, from April to December 2022. The study used a Completely Randomized Design (CRD) with 4 treatments and 5 replications. The treatment consisted of basal feed (control), basal feed 97% + herbs 3%, basal feed 96% + herbs 4%, and basal feed 95% + herbs 5%. Each experimental unit consisted of 4 chickens. The strain used was the Novogen strain aged 32 weeks as many as 80 individuals, reared for 28 days. The variables observed were feed consumption, conversion, hen day production, and egg weight. The data obtained were tabulated, then statistical analysis was carried out with ANOVA and Duncan's test. The results showed that the use of herbs had a significant (P<0.05) effect on Hen Day Production (HDP). The results showed that using as much as 3% of herbs could improve laying hens' production performance.
Co-Authors H Nurdin Lili Suryani M Sitorus Nurcaya, N S Ibrahim