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All Journal BIOMA Jurnal Ilmiah Teknik Kimia Jurnal Inovasi Teknik Kimia Journal of Chemical Process and Material Technology
Lucia Hermawati Rahayu
Politeknik Katolik Mangunwijaya
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Engineering Materials Science & Nanotechnology

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PEMBUATAN BENANG OPERASI DARI ECENG GONDOK Sari Purnavita; Lucia Hermawati Rahayu; Sri Sutanti
Bioma : Jurnal Ilmiah Biologi Vol 7, No 2 (2018): Bioma
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/bioma.v7i2.2854

Abstract

Operating thread needs in Indonesia to increase, but until now to supply the needs of operating threads absorbed (can be integrated with the body) still depends on imported products that are expensive. To reduce Indonesia's dependence on biomaterials imports in the field of biomedicine, it can be done through the engineering of operating yarn production absorbed from Indonesia's natural resources. Poly Lactic Acid (PLA) is a polymer that is widely applied as a biomaterial in biomedical fields such as operating threads. In this research, absorbable suture was made from poly lactic acid poly polymer blend from water hyacinth with natural glucomannan polymer of iles-iles. The aim of the study was to study: 1) the effect of polymerization reaction time on PLA yields and 2) the effect of poly lactic acid-glucomannan composition on the mechanical properties of operating threads. Making PLA using the ring opening polymerization method and making yarn using the wet spinning method. The independent variables at the manufacturing stage of the PLA polymer are reaction time = 60, 90, 120, and 150 minutes, while for the variable at the stage of operation yarn making is the ratio between the PLA period: glucomannan = (1: 3); (1: 2); ( 1: 1); (2: 1); (3: 1). The results showed that: 1) reaction time had a very significant effect on yield PLA and 2) different composition of poly lactic acid - glucomannan gave different tensile strength and tensile elongation values. Keywords: water hyacinth, poly lactic acid, glucomannan, operating thread
MODIFICATION OF LINDUR STARCH (Bruguiera Gymnorrhiza L.) BY OXIDATION USING SODIUM HYPOCLORITE AND FERRO SULPHATE CATALYST Lucia Hermawati Rahayu; Sri Sutanti; Mumpuni Asih Pratiwi; Rahelia Cahyaningtyas
Journal of Chemical Process and Material Technology Vol 1, No 2 (2022)
Publisher : Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (496.681 KB) | DOI: 10.36499/jcpmt.v1i2.6669

Abstract

Lindur fruit (Bruguiera gymnorrhiza L.) is widely available in Indonesia and has a high carbohydrate content, so it has the potential to be developed as a new source of energy and starch. So far, the use of lindur fruit is still limited to substitute rice and snacks. Therefore, it is necessary to make efforts to increase the utilization of lindur fruit by processing it into lindur starch and its derivatives (modified starch). The properties of lindur starch need to be improved in order to have wider uses in the food and non-food industries. The purpose of this study was to modify lindur starch by oxidation using NaOCl with ferrous sulfate as a catalyst. In this study, the effect of sodium hypochlorite concentration (2%, 4%, 6%, and 8%) and ferrous sulfate concentration (0%, 0.1%, 0.2%, and 0.3%) on the physicochemical characteristics of starch was studied. the resulting oxidized leachate and determined the optimal conditions. The results showed that all the variables studied affected the oxidation reaction of lindur starch. Oxidation at 4% NaOCl concentration and 0.2% ferrous sulfate concentration was able to produce the best values for carboxyl content, solubility, and swelling.
Karakterisasi Bioplastik Berbahan Kombinasi Pati Jagung dan Tepung Jagung dengan Perekat Poli Vinil Alkohol (PVA) dan Pemlastis Gliserol Sri Sutanti; Mumpuni Asih Pratiwi; Lucia Hermawati; Lucia Hermawati Rahayu; Handika Gilang Ramadhan
Jurnal Ilmiah Teknik Kimia Vol 6, No 2 (2022): JURNAL ILMIAH TEKNIK KIMIA
Publisher : Program Studi Teknik Kimia, Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/jitk.v6i2.20912

Abstract

The much-needed packaging materials are still dominated by synthetic plastics which are difficult to decompose and produce dioxin gas, thus polluting the environment and dangerous for humans. The solution is to use bioplastics. The study aims to determine the characteristics of bioplastics in the ratio (%)  of corn starch to corn flour: 100:0; 80:20; 60:40; 40:60; 20:80; and 0:100. The study used RAL, and descriptive analysis. Starch suspension with a ratio of 1:20 as much as 100g/run was heated at a temperature of 70-80oC for 30 minutes while stirring added with 10% PVA solution and 1 mL of glycerol heated and stirred for 10 minutes, degassed for 10 minutes, molded and dried at 50-60oC for 24 hours. The resulted bioplastics were then characterized for their water resistance, film thickness, degradation, tensile strength, elongation at break, and morphology. The results showed that the addition of corn flour increased water resistance, film thickness, degradation time, tensile strength, and elongation at break. The best results in this study were obtained at a ratio of 0:100.
Edible Coating Berbasis Pati Ubi Jalar dengan Modifikasi Karagenan dan Sorbitol untuk Memperpanjang umur simpan Tomat Ceri Lucia Hermawati Rahayu; Herman Yoseph Sriyana; Riska Kurniasari; Retno Ambarwati Sigit Lestari
Jurnal Inovasi Teknik Kimia Vol 8, No 3 (2023)
Publisher : Fakultas Teknik Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31942/inteka.v8i3.10105

Abstract

Tomat ceri kaya dengan kandungan gizi yang bermanfaat untuk kesehatan dan mempunyai nilai ekonomi cukup tinggi. Namun, buah ini mudah rusak (perishable) dan tidak tahan lama pada suhu ruang sehingga perlu penanganan pasca panen yang tepat. Salah satu caranya adalah dengan penyalutan menggunakan edible coating dari pati ubi jalar yang dimodifikasi karagenan dan sorbitol. Tujuan penelitian adalah mendapatkan konsentrasi (jumlah) karagenan dan sorbitol yang terbaik pada pembuatan edible coating dan mengetahui pengaruh penerapan edible coating terhadap mutu tomat ceri. Penelitian ini menggunakan bahan baku berupa pati ubi jalar dengan variasi penambahan karagenan (0 g; 0,1g; 0,2g; 0,3g; 0,4g) dan plasticizer sorbitol (0 ml, 2ml, 4ml, 6ml). Kualitas dan karakterisasi tomat ceri tersalut yang diuji dan dievaluasi meliputi susut bobot, kadar vitamin C, dan kontaminasi jamur. Berdasarkan hasil penelitian diperoleh bahwa semakin besar penambahan karagenan dan sorbitol, maka penurunan susut bobot dan kadar vitamin C pada tomat ceri tersalut edible coating semakin kecil, sedangkan semakin besar penambahan karagenan maka semakin kecil kemungkinan tomat ceri tersalut edible coating terkontaminasi mikroorganisme (jamur). Formula edible coating terbaik yaitu pada penambahan karagenan 0,4 g dan sorbitol 2 ml, yang memberikan kadar vitamin C tertinggi, susut bobot terendah, dan belum terkontaminasi jamur hingga hari kesepuluh.
Karakterisasi Kertas Bungkus Berlapis Bioplastik Berbasis Bahan Alam yang Aman dan Ramah Lingkungan Endah Tri Utami Handhayani; Sri Sutanti; Lucia Hermawati Rahayu; Antonio Asmaranda Putra Kusuma; Jonathan Agung Wicaksono; Elsa Selin Orxellina
Jurnal Inovasi Teknik Kimia Vol 9, No 3 (2024)
Publisher : Fakultas Teknik Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31942/inteka.v9i3.11467

Abstract

Bahan baku pembuatan kertas yaitu selulosa. Pada penelitian ini digunakan ampas tebu karena mengandung selulosa 37%. Pembuatan kertas bungkus berlapis bioplastik menggunakan metode soda dengan bahan-bahan aditif pati aren, tepung porang, gliserol, NaOH, dan PVA. Tujuan penelitian ini untuk mempelajari pengaruh penambahan gliserol (1%, 2%, 3%, 4%, dan 5%) terhadap karakteristik kertas, meliputi gramatur, ketebalan, ketahanan air, morfologi, dan tensile strength. Pembuatan kertas diawali pembuatan pulp dari serbuk ampas tebu ditambah larutan NaOH 3% (rasio 1:3) dan dipanaskan dalam autoklaf pada suhu 120°C selama 60 menit. Pulp dikeringkan dalam oven pada suhu 60°C selama 3 jam. Kemudian pati aren 5% dan tepung porang 1% ditambah aquadest dan dipanaskan pada suhu 70°C, diaduk selama 10 menit hingga membentuk gel, kemudian ditambah PVA dan aquadest, diaduk selama 5 menit. Adonan kemudian ditambah pulp ampas tebu 5% dan gliserol (1%, 2%, 3%, 4%, dan 5%), dipanaskan dan diaduk selama 10 menit. Selanjutnya degassing 10 menit. Adonan kertas dicetak dalam nampan plastik dan dikeringkan dalam oven pada suhu 60°C sampai kering. Kertas diuji gramatur, ketebalan, ketahanan air, morfologi, dan tensile strength. Hasil penelitian menunjukkan penambahan gliserol berdampak pada penurunan kualitas kertas terutama ketahanan air dan tensile strength, sehingga harus dibatasi 1 % - 2%.  
Co-Authors Antonio Asmaranda Putra Kusuma Elsa Selin Orxellina Endah Tri Utami Handhayani Handika Gilang Ramadhan Herman Yoseph Sriyana Jonathan Agung Wicaksono Lucia Hermawati Mumpuni Asih Pratiwi Rahelia Cahyaningtyas Retno Ambarwati Sigit Lestari Riska Kurniasari Sari Purnavita Sri Sutanti