Physicochemical properties of products and waste of black seed produced by cold press method

Abstract

Black seed or black cumin has the scientific name Nigella sativa (NS) is an herbal plant that is widely used to treat various diseases. The extraction of oil from NS seeds produces a byproduct called NS waste. This study aims to evaluate the physicochemical properties of products and NS waste produced by the cold press method. Analysis of physical properties was carried out using a completely randomized design (CRD) with 3 treatments and 5 replications. The thymoquinone test was carried out using high-performance liquid chromatography (HPLC). The moisture content of seed and NS waste were 6.21 and 7.91%, respectively. The crude protein content in NS seeds and waste reached 19.34 and 27.78% and crude fat contents were 23.99 and 16.93%. The TQ content in NS seeds, oil, and waste were 1680, 2701, and 350 ppm, respectively. Other active compounds in NS seeds are saponins, tannins, flavonoids, triterpenoids, and glycosides. Extraction rate of NS using cold press method is 34.46% and produces NS oil products and waste with the desired physicochemical properties, so the product can be used as material for the pharmaceutical purposes.