Salah satu cara yang digunakan di Indonesia dalam menanggulangi berlimpahnya jumlah sampah plastik di lingkungan perairan adalah dengan menggantikan kantong plastik berbahan polimer polietilen (PE) dengan plastik oxodegradable yang disebut oxium. Penelitian ini dilakukan dengan tujuan untuk melihat pengaruh mikroplastik polietilen jenis HDPE (High Density Polyethylene) dengan plastic oxodegradable oxium. Penelitian dilakukan dengan menggunakan mikroalga Tetraselmis chuii sebagai mikroorganisme yang akan mendapat perlakuan mikroplastik dengan konsentrasi yang berbeda. Dari Hasil pengukuran optical density untuk menentukan laju pertumbuhan mikroalga Tetraselmis Chuii menunjukkan bahwa laju pertumbuhan Tetraselmis  dengan perlakuan mikroplastik polietilen mengalami penurunan yang signifikan dibandingkan dengan mikroplastik oxium. Konsentrasi mikroplastik ikut berperan dalam menentukan laju pertumbuhan Tetraselmis chuii di mana pada perlakuan mikroplastik oxium terjadi penurunan hingga 37,66% pada konsentrasi mikroplastik 300mg/500mL dan 81,70% pada perlakuan mikroplastik polietilen dengan konsentrasi 200mg/500mL. Mikroplastik polietilen dan oxium memberikan dampak negatif pada organisme tingkat rendah disebabkan oleh kemampuannya dalam melepas bahan aditif yang bersifat toksik sehingga diperlukan solusi yang lebih baik untuk menggantikan fungsi plastik dengan bahan yang lebih ramah bagi lingkungan hidup.  ABSTRACTOne of the methods used in Indonesia in tackling the abundance of plastic waste in the aquatic environment is to replace plastic bags made of polyethylene (PE) polymer with oxodegradable plastic called oxium. This research was conducted with the aim of examining the effect of HDPE (High Density Polyethylene) microplastic polyethylene with oxodegradable oxium plastic. The research was conducted using the microalgae Tetraselmis chuii as microorganisms that will receive microplastic treatment with different concentrations. From the results of optical density measurements to determine the growth rate of Tetraselmis chuii microalgae, it was shown that the growth rate of Tetraselmis with polyethylene microplastics treatment decreased significantly compared to oxium microplastics. The concentration of microplastics played a role in determining the growth rate of Tetraselmis chuii where in the oxium microplastic treatment there was a decrease of up to 37.66% at the microplastic concentration of 300mg/500mL and 81.70% at the polyethylene microplastic treatment with a concentration of 200mg/500mL. Polyethylene and oxyum microplastics have a negative impact on low-level organisms due to their ability to release toxic additives so that better solutions are needed to replace the function of plastics with materials that are more environmentally friendly.

Preparation of PVA-Collagen nanofiber plaster production begin by repairing the skin of catfish, then collagen is extracted with distilled water. Extracted collagen need to be frozen dry so that collagen can be obtained in the form of sheets, powder, or crystals. The next step is the production of PVA-Collagen nanofiber, a 10% solution of polyvinyl alcohol (PVA) is mixed with a previously prepared extracted collagen and stirred until it forms a homogeneous mixture. Next, PVA-Collagen nanofiber is formed by the electrospinning method. The results of characterization using FTIR found three main groups in six variations: amide group A; amide I; and amide II. Amide A has a wave number in the range 3300-3440 cm-1, amide I is in the range 1625-1690 cm-1, and amide II is in the range of 1480-1575 cm-1. Characterization was carried out to determine the surface morphology of the observation in the sample using Photomicrograph (200 µm) with magnification 10x, produced fiber diameter formed in variations of PVA-Collagen 1% 116-120 µm while in the variation of PVA-Collagen 1% + Chitosan 10 drops in diameter 41-50 µm.