Currently the evaluation of watermelon ripeness is performed manually by tapping the surface of fruit or by visually evaluating from its appearance. However, these evaluations are subjective and inconsistent, therefore, it is necessary to develop and use a reliable instrument for this purpose. This study aimed to develop a ripening detector apparatus based on acoustic impulse response and to be used for evaluating the ripeness stage of watermelon. In this study, five different maturity ages of watermelon, namely 39, 43, 47, 51, and 55 days after planting were evaluated. The acoustic responses were recorded using Audacity 2.3.1. The dominant frequencies and magnitude were then analyzed using Matlab R2014b. The acoustic parameters were related to fruit weight and soluble solid contents to distinguish the different maturity stages. The results showed that the dominant frequencies and the magnitudes were clearly related to the fruit weight and soluble solid contents. As the frequencies and the magnitudes decreased the fruit weight and soluble solids contents consistently increased during maturity period. Therefore, this finding confirmed that the developed ripening detector was reliable to evaluate and distinguish the different ripeness stage of watermelon.
Penelitian ini bertujuan untuk mengidentifikasi mutu tepung sagu “Dwitrap†kemasan 1 kg dengan memberikan perlakuan perendaman dengan variasi jenis air: air yang berasal dari Kampung Tambat; air sumur; air mineral; dan air galon pada lama waktu perendaman 12 jam dan 24 jam untuk mencapai mutu tepung sagu sesuai SNI 01-3729-2008. Hasil yang diperoleh menunjukkan bahwa tepung sagu yang diberi perlakuan memiliki mutu yang sesuai SNI 01-3729-2008 ditinjau dari parameter kadar air (KA) yang bernilai sekitar 13%. Nilai pH yang berkisar 6-7 juga menunjukkan bahwa tepung sagu yang dihasilkan tidak mengandung asam organik yang berlebih sehingga dapat mengakibatkan sagu memiliki rasa asam. Kandungan serat kasar dan kehalusan tepung lolos ayakan 100 mesh yang diperoleh tidak belum dengan standar mutu SNI sehingga perlu dilakukan perbaikan dalam proses pengolahan sagu misalnya dengan mesin pengayak agar serat dari batang sagu tidak terikut dan menurunkan mutu tepung sagu. Hasil yang diperoleh menunjukkan adanya pengaruh perendaman terhadap peningkatan mutu tepung sagu “Dwitrapâ€.
Buah pisang dewaka merupakan buah yang tumbuh melimpah di Kabupaten Merauke. Namun, belum banyak dimanfaatkan karena rasa sedikit masam yang di milikinya saat matang. Padahal, kandungan gula sederhana pada daging buah pisang berpotensi untuk dapat digunakan dalam pembuatan bioetanol. Buah pisang akan mengalami perubahan pati menjadi gula sederhana (glukosa) selama tahap pematangan. Salah satu indikator penentuan kematangan buah adalah dengan melihat indeks warna kematangan kulit buah. Dalam pembuatan bioetanol proses fermentasi akan menghasilkan cairan yang selanjutnya dimurnikan menjadi etanol melalui proses destilasi dan limbah padat. Penelitian ini bertujuan untuk mengetahui pengaruh dari indeks warna kematangan buah pisang dewaka dan lama waktu fermentasi terhadap cairan hasil fermentasi dan limbah padat yang diperoleh dari fermentasi substrat buah pisang dewaka dengan indeks warna kematangan 3, 5, dan 7 pada lama waktu fermentasi 24, 30, dan 36 jam. Hasil yang diperoleh menunjukkan bahwa kombinasi terbaik diperoleh dari indeks warna kematangan 7 pada lama waktu fermentasi 24 jam dengan hasil cairan hasil fermentasi sebanyak 1,45 liter dan limbah padat sebanyak 0,35 kg.
Non-climacteric agricultural products are the commodity that cannot mature after being harvested so it is necessary to determine the right harvesting time to obtain the best quality. Generally, farmer will determinate the maturity of those commodity using a sound response from fruit tapping in addition to seeing the visual appearance. However, this is subjective so it is necessary to develop a more reliable and practical method. In this study a knocker maturity detection tool had been build and was used to evaluate three types of non-climacteric commodity, namely seedless watermelon aged 51, 54, 57, 60 DAP, eggplants aged 42, 44, 46, 48 DAP and cucumbers aged 27, 28, 29, 30 DAP. The knocking sound was recorded using Audacity 2.3.1 and then analyzed the frequency and magnitude parameters using Matlab R2014b. The results obtained were related to the physicochemical parameters of the samples. The results showed that the constructed knocker was able to distinguish the level of fruit maturity. In addition, it was also known that the right time for harvesting watermelon was 89 Hz or 50 dB, eggplant 157 Hz or 54 dB, and cucumber was 218 Hz or 52 dB.
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