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All Journal Pasundan Food Technology Journal (PFTJ) Unnes Science Education Journal
Puspita Diana Arumawati
Universitas Negeri Semarang
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Education Engineering Industrial & Manufacturing Engineering

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PENGARUH PERBEDAAN KONSENTRASI Acetobacter xylinum TERHADAP KUALITAS NATA DE BANANA SKIN Nur Rohmah Tria Romadhoni; Puspita Diana Arumawati; Fadhiatul Mufrihah; Pramesti Dewi; Dewi Mustikanintyas
Pasundan Food Technology Journal (PFTJ) Vol 10 No 1 (2023): PASUNDAN FOOD TECHNOLOGY JOURNAL
Publisher : Department of Food Technology, Universitas Pasundan, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/pftj.v10i1.6782

Abstract

Penelitian ini bertujuan untuk menganalisis pengaruh perbedaan konsentrasi Acetobacter Xylinum terhadap kualitas Nata de Banana dari limbah kulit buah pisang raja. Peneliti menggunakan kulit pisang sebagai objek penelitian karena terdapat senyawa pendukung pertumbuhan (growth promoting factor) dan adanya kandungan karbohidrat yang akan meningkatkan pertumbuhan mikroba. Jenis penelitian yang digunakan yaitu penelitian Eksperimen dengan pendekatan Kualitatif. Variabel dalam penelitian ini meliputi variabel bebas dengan konsentrasi mikroba Acetobacter xylinumvariasi 10%, 20%, dan 30%. Variabel terikat pada penelitian ini meliputi berat, ketebalan, dan warna pada produk Nata de Banana Skin. Variabel terkendali pada penelitian adalah variabel yang diperlakukan dalam keadaan yang sama yaitu meliputi media ekstrak kulit pisang dan lama fermentasiselama 10 hari. Hasil analisis pada masing-masing parameter dengan dua kali ulangan: Nata yang memiliki berat paling tinggi pada konsentrasi Acetobacter xylinum 20% yaitu (5g; 6g) dan 30% (8g; 7g). Ketebalan paling tinggi pada konsentrasi Acetobacter xylinum sebanyak 30% yaitu 5 mm & 4 mm. Konsentrasi Acetobacter xylinum yang digunakan tidak berpengaruh terhadap perbedaan warna nata yang dihasilkan karena memiliki warna yang sama, yaitu cream. Tetapi terdapat perbedaan kecerahan pada masing-masing konsentrasi. semakin tinggi konsentrasi Acetobacter xylinum yang ditambahkan menghasilkan warna yang lebih menguning. Pada penelitian ini memberikan hasil terbaik pada konsentrasi 30%
Analysis of the Validity and Readability of E-Supplement Based on Problem Based Learning Assissted Augmented Reality to Improving Students’ Critical Thinking Skills Puspita Diana Arumawati; Ari Yuniastuti; Dyah Rini Indriyanti; Sri Sukaesih
Unnes Science Education Journal Vol. 14 No. 3 (2025): December 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/usej.v14i3.29105

Abstract

This study aims to analyze the validity and readability of Problem Based Learning (PBL)-based e-supplements assisted by Augmented Reality in improving students’ critical thinking skills. Learning by utilizing teaching materials in the form of e-supplements integrated with PBL and Augmented Reality learning models is expected to provide a significant contribution to improving students’ critical thinking skills, as well as providing new insights in developing effective digital teaching materials. This study usedthe research and development (R&D) method but only up to the small-scale trial stage. The subjects of this study were grade XI students of SMA N 6 Surakarta. The data instruments used in this study were media and material validation questionnaires and readability questionnaires. The product validity criteria are seen from the assessment of media and material expert validators, while the readability criteria are seen from the results of student response questionnaires. The results of the study showed that the validity of the product was declared very valid with an average of 94.5% for media experts and 93.7% for material experts. The readability value was considered very good with an average of 89.8%. Based on the research results obtained, it can be concluded that PBL-based e-supplement assisted by Augmented Reality is feasible and has the potential to improve students’ critical thinking skills.
Co-Authors Ari Yuniastuti Dewi Mustikanintyas Dyah Rini Indriyanti Fadhiatul Mufrihah Nur Rohmah Tria Romadhoni Pramesti Dewi Sri Sukaesih