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All Journal Equilibrium Journal of Chemical Engineering
Dwi Ardiana Setyawardhani
Scopus ID: 57000480300, Universitas Sebelas Maret
Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Materials Science & Nanotechnology

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Modification of Sago Starch Through Lintnerization and Its Impact on Biodegradable Straw Properties Dwi Ardiana Setyawardhani; Sinta Kristiana Putri; Putri Fadilla Nisa; Fikriyyah Nur Hidayati; Hananda Christy Sutoyo
Equilibrium Journal of Chemical Engineering Vol 10, No 1 (2026): Volume 10, No 1 July 2026 (First Online)
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v10i1.104868

Abstract

The increasing environmental burden caused by plastic waste necessitates the exploration of sustainable alternatives such as starch-based biodegradable products. Sago starch, a renewable polysaccharide offers potential for such applications. However, its inherent limitations such as poor thermal stability and water resistance restrict its use in biodegradable product. This study investigates the effect of lintnerization, a mild acid hydrolysis process on the physicochemical properties of sago starch and evaluates its performance in biodegradable straw production. Sago starch was modified through a 120-hour lintnerization process using 2.2 N HCl, followed by washing and drying to obtain crystalline starch. The resulting starch was characterized by XRD and SEM, and its application in straws was assessed via yield, organoleptic tests, tensile strength, water resistance, and biodegradability. The yield of crystalline starch reached 99.89%, with organoleptic scores indicating good visual and textural quality. XRD analysis revealed an increase in crystallinity from 33.32% to 49.98%, while SEM confirmed significant granule degradation. Incorporating crystalline starch improved straw water resistance up to 83.65% and tensile strength up to 7.05 MPa fulfilling industry standards. However, the biodegradability test results were unreliable due to uncontrolled external factors. These findings demonstrate that lintnerization enhances starch performance for biodegradable applications.
Solid-Liquid Equilibrium Study of Binary System Saturated Fatty Acid in Short Chain Alcohols Dwi Ardiana Setyawardhani; Difa Aulia Majid; Rudang Suryoadhi Suryatmoko Plawi
Equilibrium Journal of Chemical Engineering Vol 8, No 1 (2024): Volume 8, No 1 July 2024
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v8i1.80577

Abstract

Unsaturated fatty acids are potential to be used for preventing degenerative diseases and developing brain function in babies. Separation of unsaturated fatty acids from saturated fatty acids efficiently achieved by urea complexation fractionation method. It is considered to be the simplest, most efficient, and lowest cost method. This study aimed to optimize urea complexation for increasing PUFA concentrations by determining solid-liquid equilibrium data of saturated fatty acids in short chain alcohols. In this study, there were two types of short chain alcohol, methanol and ethanol, in various concentrations (99,7%; 95%; 88%; 76% w/w) towards the solubility of saturated fatty acids, palmitic and stearic acid (PA and SA). PA and SA dissolved in various concentrations of methanol and ethanol to get homogeneous solutions. When solid SFA disappeared by heating the solution, or first formed by cooling the solution, the temperature was determined as the solid-liquid equilibrium temperature. The results showed that the best composition of solvent within high solubility level is ethanol 95% and methanol 99,7% over palmitic acid because it can dissolve at room temperature and below 0.01 mole fraction.Keywords:Alcohol, Fatty Acid, Solid-Liquid Equilibrium, Solubility
Co-Authors Aditya Surya Pratama Difa Aulia Majid Fasha El Sauzsa Fikriyyah Nur Hidayati Firda Dwita Putri Hananda Christy Sutoyo Putri Fadilla Nisa Rudang Suryoadhi Suryatmoko Plawi Sinta Kristiana Putri