2.1.8.2. Absorbency Under Load (AUL) - BADA

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Results showed the effect of ethanol on the swelling properties of EDTAD-AP and IZP superabsorbent hydrogels were more preferable than isopropanol and acetone respectively, because of the extent of swelling capacity of hydrogels which treated with isopropanol and acetone were lower than hydrogel that treated with ethanol. The effect of pH in buffer solutions (pH 3-12) on swelling capacity of the AP and IZP superabsorbent was also investigated. This study provided evidence to introduce isoelectric points in both AP and IZP superabsorbent hydrogels. The isoelectric point is importance in protein purification because it is the pH at which solubility is frequently minimal and mobility in an electrofocusing system is zero to form folded protein. The isoelectric points in the anionic proteins which have anionic hydrophilic groups in their structures demonstrate at certain alkaline pH contain uniform equilibrium charge distribution on their surface. According to results and schematic diagrams of the AP superabsorbent (Fig.23), the isoelectric points with maximum of swelling is around pH=9 and for IZP superabsorbent is around pH=8 (Fig.34). In this form the modified protein hydrogel surrounded by water due to minimum repulsion compare to high concentration of charged particles in acidic or basic conditions. As follow, the swelling kinetics AP and IZP superabsorbent were surveyed in deionized water. Water uptake of AP and IZP superabsorbent hydrogels increased during first hour quickly and reached a maximum water uptake level of 296 g water / g dry gel after 24 h for AP superabsorbent hydrogel, this amount was 87 g water / g dry gel after 24 h for IZP superabsorbent hydrogel. Among the reasons, the initial quick rate might be due to penetrate water into the hydrogels networks by charged groups. The decrease in the swelling rate of hydrogels after the first hour indicates to repulsion of hydrophilic groups inside the hydrogels network and difference in osmotic pressure between the internal of the hydrogels and the external solution until the equilibrium swelling is reached. To this end, the infrared spectroscopy (FT-IR) was carried out to approve the chemical structure of the unmodified and EDTAD-modified AP and IZP superabsorbent hydrogels. 43
This section consists of two parts: The experiment results of the AP-superabsorbent hydrogel are presented in first part and the second part are about experiment results of IZP-superabsorbent hydrogel. Figure 18. Schematic reactions of protein with EDTAD and GLA 44
Page 2 and 3:
BIOSUPERABSORBENT FROM PROTEINS Sar
Page 4 and 5: ACKNOWLEDGMENTS We would like to ap
Page 6 and 7: CONTENTS ACKNOWLEDGMENTS ………
Page 8 and 9: 3.4.Ⅰ. Kinetic of Swelling……
Page 10 and 11: 22- Effect of Glutaraldehyde concen
Page 12 and 13: 1 INTRODUCTION Superabsorbent hydro
Page 14 and 15: 1.1. Definition of Superabsorbency
Page 16 and 17: 1.3.1. Protein Structure Protein fo
Page 18 and 19: 2- Side chains of polar residues wi
Page 20 and 21: 1.3.3. Ovalbumin , Good Source for
Page 22 and 23: One of the paper preparation proces
Page 24 and 25: ……………………………
Page 26 and 27: 1.5. The Thermodynamic of Protein F
Page 28 and 29: In order to chemical modification o
Page 30 and 31: The swollen crosslinked polymer may
Page 32 and 33: 1.7.1.3. Crosslinking by UV-Irradia
Page 34 and 35: 1.7.2.1. Non-specific Crosslinking
Page 36 and 37: 1.8. Determination the Degree of cr
Page 38 and 39: These preparations contain consider
Page 40 and 41: MATERIALS AND METHODS 2.1. Method o
Page 42 and 43: ased on the solubility of the prote
Page 44 and 45: 2.1.2.2. Determination of Zygomycet
Page 46 and 47: 2.1.3. Modification of proteins Alb
Page 48 and 49: The first step was weighted a 30 mg
Page 50 and 51: 2.1.8.1. Centrifuge Retention Capac
Page 52 and 53: Figure 17. Schematic of device used
Page 56 and 57: Preparation of protein solution (1%
Page 58 and 59: PART Ⅰ ALBUMIN SUPERABSORBENT HYD
Page 60 and 61: 3.3.Ⅰ. Effect of Buffer solution
Page 62 and 63: Swelling (g/g) 300 200 100 0 1 0.01
Page 64 and 65: Swelling (g /g ) 350 300 250 200 15
Page 66 and 67: 3.8.Ⅰ. Effect of Temperature Prot
Page 68 and 69: In this rearrangement the R─ grou
Page 70 and 71: Calculations As a result by solving
Page 72 and 73: In the present work, increasing the
Page 74 and 75: In detail, Figure 36 shows the comp
Page 76 and 77: Sample Table 5. Comparison of swell
Page 78 and 79: The IZP-hydrogel compared with unmo
Page 80 and 81: According to our results, the swell
Page 82 and 83: REFERENCES 1- Fredric L.Buchholz &
Page 84 and 85: 32- Alexander,. J, Colloid chemistr
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2.1.8.2. Absorbency Under Load (AUL) - BADA

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