Jurnal Natural

ANALYSIS OF BISPHENOL-A (BPA) LEVELS IN POLYCARBONATE (PC) GALLON BOTTLES MIGRATED TO ETHANOL SIMULANT BY HPLC IN MANOKWARI REGENCY

2025-12-19T07:26:56+00:00

Polycarbonate (PC) gallon containers are known to contain Bisphenol-A (BPA), a compound that may migrate into the water and pose health risks, particularly when exposed to high temperatures. This study aims to analyze the migration levels of BPA from No. 7 PC gallon containers into a 20% ethanol simulant solution, reflecting the conditions of products circulated in Manokwari Regency. Samples were incubated at 60°C for two different durations: 2 hours and 10 days. The analysis was performed using High-Performance Liquid Chromatography (HPLC) with a fluorescence detector. The results indicated that incubation time affected BPA migration levels. No BPA migration was detected after 2 hours of incubation; however, after 10 days, BPA was detected at concentrations ranging from 0.007 to 0.017 ppm. Furthermore, an analysis of 18 No. 7 PC gallon samples available in the Manokwari market showed that all samples contained BPA, with concentrations ranging from 0.005 to 0.185 ppm. All detected BPA levels remained below the maximum limit set by the Indonesian National Agency of Drug and Food Control (BPOM Regulation No. 20 of 2019), which is 0.6 ppm.

AKTIVITAS ANTIOKSIDAN EKSTRAK HEKSANA, ETIL ASETAT DAN METANOL BIJI KELOR (Moringan oleifera Lamk.) ASAL KABUPATEN MANOKWARI

2026-01-15T06:44:16+00:00

ABSTRACT: Antioxidant activity testing of hexane, ethyl acetate (EtOAc), and methanol (MeOH) extracts of M. oleifera seeds was carried out using the DPPH method. The extraction method employed was Soxhlet extraction, which is a type of continuous extraction using an organic solvent at a specific temperature and solvent volume. The yields of each extract were 26.76%, 9.86%, and 39.02%, respectively. The antioxidant activity of the seed extracts was determined based on their IC₅₀ values. Vitamin C was used as a positive control, with an IC₅₀ value of 42.78 ppm. The antioxidant activities of the hexane, EtOAc, and MeOH extracts were 406.09, 399.03, and 135.83 ppm, respectively. The highest antioxidant activity was observed in the MeOH extract, which falls into the category of moderate antioxidant activity.

Keywords: Antioxidant, Moringa oleifera seeds, DPPH, hexane extract, ethyl acetate extract, methanol extract

UJI PERFORMA MODUL PELTIER TIPE TEC1-12715 SEBAGAI SISTEM PENDINGIN PADA COOLBOX

2026-02-02T06:20:07+00:00

A Peltier module is a type of Thermoelectric Cooler (TEC) utilized in this study as the cooling system for a coolbox. The objective of this research is to analyze the cooling rate, the lowest achievable temperature, and the performance of the Peltier module by varying the number of modules and the cooling load. The experiment was conducted using variations in the number of Peltier modules (one and two) and variations in the cooling load an empty coolbox and a coolbox containing 1 liter of water. The results indicate that using two Peltier modules accelerates the cooling process and achieves a lower minimum temperature. The lowest temperatures recorded for the empty coolbox were 21⁰C for one module and 19.8⁰C for two modules. For the coolbox containing 1 liter of water, the lowest temperatures achieved were 22.9⁰C for one module and 22.6⁰C for two modules. An increase in the number of modules leads to a greater amount of heat extracted. The heat extracted by one Peltier module in the empty coolbox was 2882.4 J and 3270.1 J for two Peltier modules. In the coolbox containing 1 liter of water, the heat extracted was 22608.55 J for one module and 27418.9 J for two modules. This study also determined the Coefficient of Performance (COP) of the Peltier module system. The COP for the empty coolbox was 4.38% for one module and 3.66% for two modules. Conversely, the COP for the coolbox with 1 liter of water was 2.75% for one module and 2.31% for two modules. The highest COP recorded was 4.38% for one module and 3.66% for two modules, both occurring when the coolbox was empty coolbox (no load).

Perancangan Sistem Pengukuran Suhu dan Kelembapan Ruang Laboratorium Komputer Menggunakan Sensor DHT22 Berbasis Arduino Uno

2026-02-12T16:02:24+00:00

Penelitian ini bertujuan untuk merancang dan mengimplementasikan sistem pengukuran suhu dan kelembapan udara menggunakan sensor DHT22 berbasis mikrokontroler Arduino Uno. Berdasarkan alat pengukuran suhu menggunakan sensor DHT22 berbasis Arduino Uno, data hasil pengukuran suhu dan kelembapan ditampilkan pada layar LCD 16x2. Hasil pengujian menunjukkan bahwa sistem mampu membaca suhu dan kelembapan dengan rata-rata deviasi 0,3°C dan 9,76 % RH dibandingkan alat ukur standar HC520, sehingga layak digunakan untuk aplikasi monitoring suhu ruangan laboratorium berskala kecil, namun untuk pengukuran kelembapan masih perlu dilakukan kalibrasi agar dapat sesuai dengan alat ukur standar.