STUDY OF INFLUENCE OF GROWING MEDIUM AND AGE ON THE COMPOSITION OF COMPOUND’S CINCAU LEAVES (PREMNA OBLONGIFOLIA MERR.) USING DIFFUSE REFLECTANCE INFRARED SPECTROSCOPY (DRIS) TECHNIQUE

• Main Author: Andari, Melina
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/34769
• Institution: Institut Teknologi Bandung

Green grass jelly (Premna oblongifolia Merr.) is one of the plants which used by Indonesian’s people as the manufacturing material content of beverages and also as medicines. Grass jelly is usually used as gel. Grass jelly plant has many advantages, so it need to be cultivated. This research studies the factors which influence the quality of grass jelly leaves, such as age, growing medium, nutrient, and also will be determinated the composition of compound in grass jelly leaves using Diffuse Reflectance Infrared Spectroscopy (DRIS) technique. The result shows IR spectra of composition of compound in grass jelly leaves which is expected to represent it’s quality. So that, grass jelly leaves can be used optimally, but still efficient. Before analysis, grass jelly is planted in 3 different medium: Lembang soil, raw rice husk, and a mixture of Lembang soil : raw rice husks (1:1, V/V). Provision of nutrients carried out by using a solution of NPK once a week. Based on the research, it is known that age affects on IR spectra of compounds which is contained in grass jelly leaves. To determine the best grass jelly leaves quality, well done characterization includes determination of moisture content, ash, minerals, fat, and carbohydrate. Determination of water content and ash carried out by gravimetric method, fat content by soxhlet extraction method, minerals by atomic absorption spectroscopy method (AAS) and atomic emission spectroscopy (AES), and carbohydrate by Anthrone method. Generally, for all types of growing medium, the young leaves have higher water content than the old one. In contrast, ash content in the young leaves is lower than the old one. The young leaves have higher fat content than the old one, except for leaves which grown in the soil. The old leaves have higher carbohydrate content than the young one, except for leaves which grown in mixed medium Lembang soil : raw rice husk (1:1, V/V).