การเกิดโคเอเซอร์เวตระหว่างเจลาตินและโพลีแซคคาไรด์ (กัมอะราบิก, กัมจากกากข้าวโพด และคาร์บอกซีเมทิลเซลลูโลส) ที่พีเอชต่าง ๆ
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Abstract
Abstract
Formation of coacervates gelatin (GE) and polysaccharides (gum arabic, GA; corn fiber gum, CFG; carboxymethyl cellulose, CMC) was studied. The mixtures of GE : GA (ratio 2 : 1), GE : CFG (ratio 1 : 1) and GE : CMC (ratio 1 : 1) at pH 2-7 was prepared. The formation of coacervates was investigated by measurements of turbidity at 600 nm and zeta-potential. The particle size distribution of coacervates at the highest turbidity value was also analyzed. The results showed that at high pH the turbidity of the mixtures were very low. As the pH decreased the turbidity was increased until it reached a maximum turbidity, after that decreased again to very low value and became transparent at pH 2. The pH that gave maximum coacervates was depended on types of mixture. The maximum coacervates occurred at pH 4.3, 4.4 and 3.1 for GE : GA, GE : CFG and GE : CMC, respectively and coacervates occurred at these pH were found to have zeta-potential value close to zero. GE : CFG showed the small size of coacervates (mean size 8.02 µm) of narrow size distribution. GE : GA gave the largest size of coacervates (mean size 69.15 µm) with a wide range of particle size. GE : CMC showed a wider range of particle size with a larger size than GE : CFG but smaller than GE : GA (mean size 32.88 µm).
Keywords: coacervate; gelatin; gum arabic; corn fiber gum; carboxymethyl cellulose
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References
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