改性壳寡糖中羧基含量对其吸湿保湿和抗氧化性能的影响

doi:10.3969/j.issn.1001-1803.2020.10.006

Abstract

Abstract:

Modified chitooligomer （MC） was prepared by oxidation of chitooligomer （COS） using laccase/TEMPO/O₂ system （TEMPO dosage was controlled at 1%, 2%, 4% and 8%）. The carboxyl content and water existing forms in products were analyzed by conductometric titration and low-field nuclear magnetic resonance （LF-NMR）, and the moisture absorption-retention activity and anti-oxidant activity were detected. The results show that the carboxyl content in MC increases with the TEMPO usage, and the carboxyl content in MC-8 is as high as 2.82%. With the increase of carboxyl content, the amount of bound water in MC increases at first and then decreases, and the moisture absorption-retention capacity shows the same trend. The moisture absorption rate of MC-2 in saturated ammonium sulfate and saturated potassium carbonate solution for 60 h is up to 63.14% and 20.26%, respectively. The moisture retention rate for 24 h is 4.71%. The increase of carboxyl content is beneficial to improve the anti-oxidant activity of the product, and the ABTS radical scavenging rate of MC-8 at the mass concentration of 0.5 g/L is 85.47%. The study indicates that MC has potential application value in the field of cosmetics.

Key words: modified chitooligomer, carboxyl content, intramolecular water existing forms, moisture absorption-retention activity, anti-oxidant activity

CLC Number:

O636.1

PAN Yu-fan,ZHANG Fang-dong,BU Xin,PEI Ji-cheng. Effects of carboxyl content in modified chitooligomer on moisture absorption-retention and anti-oxidant activities[J].China Surfactant Detergent & Cosmetics, 2020, 50(10): 687-692.

Figures/Tables 7

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References 22

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样品	R_h/%
样品	0 h	2 h	4 h	6 h	8 h	10 h	12 h	24 h
COS	100	20.12	5.36	0.90	0.40	0.30	0.25	0
MC-1	100	64.24	48.12	32.75	20.14	10.84	6.04	2.12
MC-2	100	68.84	51.28	35.17	23.15	13.06	10.43	4.71
MC-4	100	66.75	49.06	33.84	22.07	12.45	8.29	3.64
MC-8	100	65.41	48.28	32.87	21.26	11.33	7.18	2.86
HA	100	67.12	49.87	34.32	22.44	12.76	9.13	4.00

Effects of carboxyl content in modified chitooligomer on moisture absorption-retention and anti-oxidant activities

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