The standard practice is to give a large amount of water (EW) for each treatment. 3 g( 0.2 g) sample? Is sh gel weighed and placed between two layers? Filter paper Put the sample in a 50 ml centrifuge tube at the bottom, and centrifuge 65438 0000 grams 65438 05 minutes at 65438 05℃. Rez, look! Pez- lyrical tone,&; Voltammetry' zquez, 2003). Immediately after centrifugation, and then? Weigh the Sh gel sample, and the EW plan is: extrudable water (%)=(Wi-Wf)/Wi* 100, where Wi is the initial gel weight and Wf is? The weight of nal gel.

2.7.TBA test

Methods Based on Gomez, Girba, nascimento and Forma. (2003)TBA(2 thiobarbituric acid) solution Prepare to weigh 0.3g of TBA, and transfer 90ml of distilled water in a100ml beaker. Soak the beaker in water for one hour (80°C) until it is completely decomposed. Then transfer the solution to 100 ml capacity? In order to obtain a solution of 0.02 1 M TBA, ask and use the volume of distilled water. The chopped sample (50g) was mixed with 6ml butylated hydroxytoluene (BHT, 1 g/L) to avoid natural oxidation. Does the divisibility of homogenized sample (10 g) shift to unity? According to ...

Add 2.5 ml of 4 N HCl and 97.5 ml of water to the falling silicone resin defoamer. Then this sample is distilled. Collect the first 50 ml of distillate. Distillation and delivery in triplicate. Then, 5ml of distillate and 0.6 ml of BHT (1g/L) were added to 0.02 1 M TBA solution, and 5ml of distillate was put into a test tube with a screw cap and heated in a water bath (90°C) for 40 minutes to make it pink. The test tube was then cooled and the optical density was measured. The 532 nm quality control on the spectrophotometer (Spectrum -cn 722E, China) contains 5 ml of distilled water, 5 ml of TBA solution and 0.6 ml of BHT. TBA value is expressed as milligrams of malondialdehyde (MDA) per kilogram of sample. Focus (attention)

MDA plans to use 1, 1, 3,3 tetraethoxy propane (TEP) as the standard compound in the standard curve.