Protein isolate from soy bean (Glycine soja L.) tempeh, mung bean (Phaseolus radiatus L.) tempeh and kidney bean (Phaseolus vulgaris L.) tempeh are natural source of folic acid with main role in brain smartness. 0.15 µm microfiltration (MF) membrane fitted in dead-end stirred microfiltration cell (SMFC) was able to separate protein isolate from three (3) kinds of tempeh at stirrer rotation speed 400 rpm, room temperature and pressure 40 psia for 30 minutes. The result of experimental work showed that SMFC had potential use in separation of protein isolate affected by kinds of bean and membrane performance on isolate composition in retentate and permeate. SMFC was able to retain better protein isolate in retentate than that passing across permeate. Retentate of protein isolate from soy bean tempeh, mung bean tempeh and kidney bean tempeh had subsequently compositions of folic acid 362.07, 254.07 and 506.07 µg/mL, total solids 5.56, 4.08 and 1.82 %, N-Amino 4.34, 3.36 and 0.56 mg/mL, and dissolved protein 0.79, 0.34 and 0.72 mg/mL. In this process condition, SMFC was able to increase folic acid in protein isolate retentate of soy tempeh of 0.59 times, mung bean tempeh of 1.1 times and kydney bean tempeh of 1.42 times before purification process in retentate. Based on both SMFC performance and efficiency, all the best purification optimization were obtained kidney beans tempeh. Identification of monomer of kidney bean tempeh protein isolate gave monomers of folic acid, glutamic acid and folic acid fractionation with molecular weight of 443.5797, 148.1643 and 221.2132 Da. and relative intensity of 1.28, 50.11 and 7.05 %, respectively.
Penelitian ini bertujuan untuk melakukan formulasi dalam pembuatan pasta fortifikan asam folat alami yang terdiri dari campuran tempe (kedelai dan kacang hijau), sayuran terfermentasi (brokoli dan bayam), dengan nikstamal jagung kuning dan jagung putih jenis gigi kuda guna mengetahui rasio terbaik campuran ketiga bahan tersebut terhadap konsentrasi asam folat dan identifikasi monomer-monomernya. Rangkaian proses fermentasi tempe dan sayuran masing-masing dilakukan menggunakan Rhizopus oligosporus strain C1 dan kultur Kombucha, serta nikstamalisasi jagung dilakukan dengan menggunakan Ca(OH) 2. Formulasi dilakukan dengan mengatur rasio campuran tempe plus sayuran terfermentasi dan nikstamal jagung pada rasio 1:1, 1:2, 1:3, 1:4, dan 1:5. Analisis dilakukan terhadap protein terlarut, total padatan, gula reduksi, total gula dan asam folat. Identifikasi asam folat dan asam glutamat dilakukan melalui LC-MS. Penelitian ini berhasil untuk menentukan rasio terbaik guna menghasilkan asam folat tertinggi serta berhasil mengidentifikasi monomer asam folat dan asam glutamat pasta fortifikan asam folat. Kesimpulannya, formulasi pasta fortifikan asam folat terbaik dapat dicapai pada kombinasi pasta campuran tempe plus sayuran terfermentasi dengan nikstamal jagung pada rasio 1:5.
Effect of Fermentation on Antioxidant Activities and Betacyanin Content of Functional Beverages from Dragon Fruit and BeetrootKombucha is a traditional beverage prepared by fermenting polyphenol-rich tea using a consortium of bacteria and yeast (SCOBY). Dragon fruit and beetroot contain a significantly high amount of polyphenols and betacyanin as antioxidants which are beneficial in reducing the risk of cardiovascular disease, cancer, and the body's natural degeneration related to the early-aging process. This study aims to determine changes in antioxidant activity and levels of betacyanin from fermented dragon fruit and beetroot as functional drinks during different fermentation times. The results showed that there was a correlation between fermentation time and antioxidant activity in its ability to counteract free radicals, ferric reducing antioxidant power (FRAP), and the levels of betacyanin produced. Longer fermentation time caused an increase in free radical inhibition and reduction of iron ions but reduced the levels of betacyanin. The optimum value of free radical inhibitory activity (DPPH) was obtained in the 12-day fermented dragon fruit drink with an inhibitory value of 80.76%, ability to reduce iron ions by 197.94 µg ascorbic acid mL-1, and betacyanin level of 0.055 mg L-1Keywords: antioxidants, dragon fruit, betacyanin, beetroot, functional beverages ABSTRAKKombucha merupakan minuman tradisional hasil olahan fermentasi teh yang kaya polifenol dengan konsorsium bakteri dan yeast (SCOBY). Buah naga dan umbi bit memiliki polifenol dan senyawa betasianin yang cukup tinggi sebagai antioksidan yang bermanfaat dalam menurunkan risiko penyakit kardiovaskular, penyakit kanker dan degenerasi alami tubuh terkait proses penuaan dini. Penelitian ini bertujuan untuk mengetahui perubahan aktivitas antioksidan dan kadar betasianin dari fermentasi buah naga maupun umbi bit sebagai minuman fungsional selama waktu fermentasi yang berbeda. Hasil penelitian menunjukkan bahwa adanya korelasi antara waktu fermentasi terhadap aktivitas antioksidan dalam kemampuannya menangkal radikal bebas, kemampuan mereduksi ion besi (FRAP), dan kadar betasianin yang dihasilkan. Semakin lama waktu fermentasi menyebabkan peningkatan penghambatan radikal bebas dan reduksi ion besi, namun menurunkan kadar betasianin. Nilai aktivitas penghambatan radikal bebas (DPPH) optimum diperoleh dari minuman fermentasi buah naga selama waktu fermentasi 12 hari dengan nilai penghambatan sebesar 80,76%, kemampuannya dalam mereduksi ion besi sebesar 197,94 µg asam askorbat mL–1, dan kadar betasianin sebesar 0,055 mg L–1
Protein isolate produced through fermentation of soy beans (Glycine soja L.), mung beans (Phaseolus radiatus L.) and kidney beans (Phaseolus vulgaris L.) using fungi of Rhizopus sp. (mixture) or Rhizopus oligosporus C1 (single) are natural source of folic acid for formulation of smart foods. The objective of this experimental activity was to know potential use of fermented beans (tempeh) as protein isolate as a result of pulverizing process and filtration through 100 mesh sieve and characteristic of its monomer, particularly glutamic acid as a part of folic acid via LC-MS. Protein isolate extract was generated via pulverizing mixture between soy tempeh, mung bean tempeh and kidney bean tempeh, and water with ratio of 1 : 1, 1 : 2, 1 : 3, 1 : 4 and 1 : 5, respectively followed by filtration through 100 mesh sieve. The result of experimental activity displayed that interaction of all treatments affected on composition of tempeh extraction result as protein isolate. Identification using LC-MS showed that difference in relative intensity for 3 kinds of tempeh on presence of glutamic acid. Protein isolates from soy tempeh, mung bean tempeh and kidney bean tempeh produced domination of glutamic acid monomer indicated subsequently at chromatogram with T 4.1, T 5.7 and T 7.1; T 4.0 and T 3.9.
ABSTRAKIsolat protein yang diperoleh melalui fermentasi kacang kedele (Glycine soja L.), kacang hijau (Phaseolus radiatus L.) dan kacang merah (Phaseolus vulgaris L.) menggunakan kapang Rhizopus sp (campuran) atau Rhizopus oligosporus C1 (tunggal) adalah sumber asam folat alami untuk formulasi pangan pintar. Penelitian ini bertujuan untuk mengetahui potensi kacang-kacangan terfermentasi (tempe) sebagai isolat protein melalui proses pelumatan dan filtrasi lolos 100 mesh serta karateristik monomernya terutama asam glutamat sebagai bagian dari asam folat melalui LCMS. Ekstraksi isolat protein dilakukan melalui pelumatan dan filtrasi lolos 100 mesh pada tempe kedele, tempe kacang hijau dan tempe kacang merah pada rasio tempe dan air 1:1, 1:2, 1:3, 1:4 dan 1:5. Hasil penelitian menunjukkan bahwa interaksi seluruh perlakuan berpengaruh terhadap komposisi hasil ekstraksi tempe sebagai isolat protein. Idensifikasi melalui LCMS memperlihatkan bahwa isolat protein tempe kedele, tempe kacang hijau dan tempe kacang merah menghasilkan dominasi monomer asam glutamat yang ditunjukkan berturut-turut pada kromatogram dengan T4.1, T 5.7 dan T7.1 ; T 4.0 dan T 3.9.Kata-kata kunci : tempe, isolat protein, asam folat, asam glutamat, pelumatan.
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