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All Journal JURNAL REKAYASA DAN MANAJEMEN AGROINDUSTRI

Bambang Admadi Hasojuwono

Dosen Program Studi Teknologi Industri Pertanian, Fakultas Teknologi Pertanian, Unud

Author-ID : 2929514

Agriculture, Biological Sciences & Forestry

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Karakteristik Biokomposit Foam Maizena dan Glukomanan pada Perlakuan Konsentrasi Campuran Sorbitol dan TDI-80 Ignatia Karolina Sarito; Bambang Admadi Hasojuwono; Ni Putu Suwariani
JURNAL REKAYASA DAN MANAJEMEN AGROINDUSTRI Vol 9 No 4 (2021): Desember
Publisher : Department of Agroindustrial Technology, Faculty of Agricultural Technology, Udayana University

This study aims to know the effect of the concentration of a mixture of sorbitol and TDI-80 on the characteristics of cornstarch and glucomannan foam biocomposite and to determine the concentration of a mixture of sorbitol and TDI-80 which produces the best characteristics of cornstarch and glucomannan foam biocomposite. This study used a completely randomized design (CRD) with 5 treatments with 4 repetitions so that there were 20 experimental units with variations in the mixture of sorbitol and TDI-80 (5%, 10%, 15%, 20% and R5 = 25%) with a ratio of 1:1. The data obtained were analyzed for diversity (ANOVA) and continued with the Tukey test using Minitab 17 software. The variables observed were hardness, bouncing spring, breaking stress, elongation at break, tear resistance, constant compression and biodegradation. The results showed that the concentration of the mixture of sorbitol and TDI-80 had an effect on mass density, hardness, bouncing spring and constant compression, breaking stress, elongation at break and tear resistance. The best cornstarch and glucomannan foam biocomposite was obtained in the treatment with a mixture of sorbitol and TDI-80 concentration of 25% with a hardness value of 5.15 kg, a constant compressive value of 3.15%, a mass density of 0.12 g/mL, and a rebound spring of 22.91. %, breaking stress 0.05 N/mm2, elongation at break 4.52%, tear resistance 0.04 N/cm3 and biodegradation rate within 8 days days. Keywords: biocomposite foam, cornstarch, glucomannan, concentration of sorbitol and TDI-80.

Pengaruh Persentase Ampas Kopi Robusta (Coffea canephora) dan Suhu Pemanasan terhadap Karakteristik Body Scrub Thisia Anggraeni Pribadi; Bambang Admadi Hasojuwono; Ni Putu Suwariani
JURNAL REKAYASA DAN MANAJEMEN AGROINDUSTRI Vol 9 No 4 (2021): Desember
Publisher : Department of Agroindustrial Technology, Faculty of Agricultural Technology, Udayana University

Body scrub is one of the cosmetic products used for skin care. Body scrubs have coarse granules that function to remove dead skin cells and clean the skin optimally, which is called abrasive or sanding. This study aims to determine the effect of the percentage og coffee grounds and heating temperature and their interaction on the characteristics of the body scrub and to determine the percentage of coffee grounds and the right heating temperature so as to produce a body scrub with the best characteristics. This study used a factorial randomized block design with two factors. The first factor is the percentage of coffee grounds with 3 levels, namely 4, 6 and 8%, while the second factor is the heating temperature with 3 levels, namely 65, 70 and 75?C. The results showed that the percentage of coffee grounds had an effect on ph, viscosity, spreadability, adhesion, total phenolic compounds and overall body scrub acceptance. The heating temperature affects the viscosity, spreadability, adhesion, total phenolic compounds and overall acceptance of the body scrub but the heating temperature has no effect on the ph of the body scrub. The interaction between the percentage of coffee grounds and the heating temperature had no effect on ph, viscosity, spreadability, adhesion, total phenolic compounds and overall acceptance of the body scrub. The percentage of 4% coffee grounds and a heating temperature of 65?C is the best treatment of body scrub with characteristics of ph 5.93, viscosity of 7600 cp, dispersion of 5.6 cm, adhesion of 5.78 seconds, separation ratio = 1, total phenolic compounds 1.52 mg GAE/g and overall acceptance was 4.95 (regular to moderate). Keywords : body scrub, coffee ground, heating temperature

Pengaruh Konsentrasi Asam Stearat dan Lama Pengadukan Proses Gelatinisasi terhadap Karakteristik Komposit Bioplastik Maizena-Glukomanan Reksi Julnigo Haloho; Bambang Admadi Hasojuwono; Ni Putu Suwariani
JURNAL REKAYASA DAN MANAJEMEN AGROINDUSTRI Vol 9 No 4 (2021): Desember
Publisher : Department of Agroindustrial Technology, Faculty of Agricultural Technology, Udayana University

This study aims to determine the effect of stearic acid concentration and the stirring time and also the interaction of both on the characteristic of the cornstarch-glucomannan bioplastic composite and also to determine the cornstarch-glucomannan bioplastic composite on the concentration of stearic acid and stirring time produce the best characteristic. The research used a factorial randomized block design. The first factor is the concentration of stearic acid consisting of 4 levels that is 0.1%; 0.2%; 0.3%; 0.4% (w/w). The second factor is stirring time consisting of 4 levels that are 3, 4, 5, 6 minutes. The observed variable on this study were tensile strength, elongation at break, modulus young, swelling, water vapour transmission rate (WVTR), biodegradation, and functional group profile. The data were analyzed of variant and continued with Duncan Multiple Range Test (DMRT). The result of this study indicate that the concentration of stearic acid and stirring time of gelatinization process has a very significant effect on the tensile strength, modulus young, swelling, water vapour transmission rate (WVTR), biodegradation, but the concentration of stearic acid had no significant effect on elongation at break. The interaction between treatments has a very significant effect on elongation at break. Concentration stearic acid 0.4% and stirring time 6 minutes treatment resulted in the best bioplastic composite with a tensile strength 22.17 MPa, elongation at break 8.55%, modulus young 260.87 MPa, swelling 81.58%, water vapour transmission rate 0.638 g/m2.hour and biodegradability 7 days. The composite of cornstarch-glucomannan and stearic acid consists of hydroxyl (O-H), carboxyl (C-O), carbonyl (C=O), and hydrocarbon (CH2)n. Keywords : bioplastic, cornstarch, glucomannan, stearic acid, stirring time

Karakteristik Komposit Bioplastik Maizena dan Glukomanan pada Perlakuan Jenis dan Konsentrasi Bahan Pengisi Anissa Fitri Nur Aini; Bambang Admadi Hasojuwono; Lutfi Suhendra
JURNAL REKAYASA DAN MANAJEMEN AGROINDUSTRI Vol 9 No 4 (2021): Desember
Publisher : Department of Agroindustrial Technology, Faculty of Agricultural Technology, Udayana University

This study aims to know the effect of the type and concentration of filler on the characteristics of cornstarch and glucomannan bioplastic composites, and determine the type and concentration of fillers that can produce bioplastic composites that meet the Indonesian National Standard (SNI) and International Standard. This study used a randomized block design with two factors. Factor I is a type of filler consisting of ZnO, CaCO3, clay, nanocellulose. Factor II is the concentration of filler which consists of 4 levels, namely 0%; 5%; 10%; 15%. This experiment resulted in 16 treatment combinations and were grouped into 2 groups so that 32 experimental units were obtained. The data were analyzed for diversity and continued with the Tukey test using Minitab17 software. The results showed that the type and concentration of filler had a very significant effect on tensile strength, elongation, modulus young, swelling, biodegradation and had a significant effect on WVTR. The interaction has a very significant effect on tensile strength, modulus young, swelling, WVTR and has a significant effect on elongation and biodegradation. Cornstarch and glucomannan bioplastic composites that meet the Indonesian National Standard (SNI) and International Standard on tensile strength and biodegradation variables using nanocellulose fillers with concentrations of 10% and 15% which have tensile strength characteristics of 15,23 and 16,93 MPa, elongation at break of 11,47 and 10,76 %, modulus young of 132,81 and 158,61 MPa, swelling of 68,93 and 69,58 %, WVTR 1,18 and 1,24 g/m2.hr, biodegradation rate for a long time 7 days. Maizene and glucomannan bioplastic composites contain hydrocarbon functional groups -(CH2)n, carboxyl (C-O), alkene (C=C), alkyne (C?C), hydroxyl carboxylic acid (O-H), hydroxyl alcohol (O-H), carbonyl (C=O) and aromatic compounds (C-H). Keywords: bioplastic composite, cornstarch, glucomannan, ZnO, CaCO3, clay, nanocellulose

Co-Authors Anissa Fitri Nur Aini Ignatia Karolina Sarito Lutfi Suhendra Ni Putu Suwariani Reksi Julnigo Haloho Thisia Anggraeni Pribadi

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