Nello studio più recente, quello di cui ho tradotto l'abstract e che costituisce il corpo dell'articolo, lo ottengono (per l'esattezza) dalle ceneri (ash) della crusca di riso.
RBM was obtained from the carbonized chaff of rice bran (Japonica, Oryza sativa). Briefly, a 200-g aliquot of rice bran ash was added to 1 L distilled water and stirred at 400 rpm at 100°C for 24 h. And, the mixture was filtered through 10-µm filter paper, centrifuged at 22g for 30 min at 25°C to remove any remaining particulates to obtain the supernatant of 800 ml. Next the supernatant was concentrated to 10-folds and then sterilized by filtration through a 0.2-µm syringe filter to obtain the final RBM extract of 80 ml
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Rice bran ash, the end-product of rice bran incineration, is rich in silicon (Si, 65 wt%), but also contains other minerals, such as potassium (K), phosphorous (P), carbon (C), K2O, CaO, Na2O, MgO, Al2O3, ZnO, MnO2, and Fe2O3, as well as soluble silicic acids [11].
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