Oxygen content, test medium

Initially, tests were performed to verily the best supplementary carbon source for lipase production, using the conditions described by Penha et al. [19]. The experiments were carried out in Erlenmeyer flasks (250 ml), and the fermentation medium consisted of 100 g of powdered wheat bran (60% moisture adjusted adding a 0.91% (m/v) ammonium sulfate solution, pFl=7.0) and 2% mim of vegetable oil (castor, soybean, olive, com, and palm oils). The medium was mixed and sterilized at 1.0 atm for 15 min, and afterwards, inoculated with 10 spores/g substrate. All flasks were closed and incubated in a biochemical oxygen demand (BOD) environment, keeping the moisture and ventilation conditions constant, at 32 C for 96 h. Then, the samples were analyzed to determine the glycosamine content and the lipase activity. 

Nitrile rubber containing the antioxidant specified in Fig. 3 exhibits improved oxygen absorption resistance both before and after methanol extraction (Fig. 4). This property has been confirmed in final product application testing where the non-volatility and non-extractability of the stabilizer guarantees a long-term antioxidant effect.A range of antioxidant-bound NBR polymers has now been commercialized and a comparison of the typical physical property differences of the medium-low acrylonitrile content polymer when compared with a conventional NBR is shown in Table 5. 

Chemical oxygen demand. The amount of ojygen equivalent of the organic matter required to complete chemical oxidation in an acidic medium. The COD test is used to measure the organic content of wastewater and natural water. 

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