There is a certain spontaneous adsorption behavior between polyphenols and plant cell wall materials, and this adsorption behavior has a positive impact on the bioavailability and processing utilization of polyphenols. This research attempted to combine natural antioxidant polyphenols with ginkgo husk nanocellulose, aiming to explore the adsorption behavior and kinetics of different types of polyphenols by cellulose and to prepare a cellulose/phenol composite particle with antioxidant function. In this experiment, the pore properties of ginkgo shell nanocellulose were characterized by nitrogen adsorption apparatus, and the adsorption behavior of catechins, tea polyphenols, EGCG, gallic acid and ferulic acid on the nanocellulose of the ginkgo shell was studied. The first- and second-order kinetic models were used to fit the adsorption curves, the Weber-Morris interparticle diffusion model was used to describe the adsorption process, the surface chemical structure of cellulose before and after adsorption of polyphenols was analyzed by XPS, and the anti-oxidation ability of the composite particles was investigated based on the DPPH/ABTS+ free radical scavenging ability. The experimental results showed that the specific surface area and pore volume of nanocellulose particles were 246.71 m2/g and 0.35 cm3/g, respectively. The five selected polyphenols could all be adsorbed on cellulose spontaneously, which showing a fast-slow-balanced adsorption process. Among them, the adsorption capacity of ginkgo husk cellulose for catechins was the largest, which reaching 3.7 mg/g cellulose. Taking catechins as an example, the effects of ionic strength, pH and temperature on the adsorption were further investigated. Neutral pH and high ionic strength were beneficial to the adsorption of polyphenols by cellulose, however, temperature changes had no significant effect on the adsorption. After cellulose adsorbs catechins, the chemical structure of its surface changes. The catechin-adsorbed nanocellulose particles exhibit a certain antioxidant capacity, which provides more possibilities for the application of cellulose.
WU Jingjing
,
NI Yang
,
LI Yan
,
CHAO Erpeng
,
GONG Yuhong
,
LI Jinwei
,
FAN Liuping
. Adsorption behavior and kinetics of different kinds of polyphenols by ginkgo husk cellulose[J]. Food and Fermentation Industries, 2022
, 48(11)
: 121
-128
.
DOI: 10.13995/j.cnki.11-1802/ts.028304
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