Effect of honeysuckle leaf extract on the physicochemical properties of carboxymethyl konjac glucomannan/konjac glucomannan/gelatin composite edible film

Meng Wang; Yun-Cheng Li; Fan-Bing Meng; Qiao Wang; Zheng-Wu Wang; Da-Yu Liu

doi:10.1016/j.fochx.2023.100675

Effect of honeysuckle leaf extract on the physicochemical properties of carboxymethyl konjac glucomannan/konjac glucomannan/gelatin composite edible film

Food Chem X. 2023 Apr 8:18:100675. doi: 10.1016/j.fochx.2023.100675. eCollection 2023 Jun 30.

Authors

Meng Wang¹, Yun-Cheng Li^{1

2}, Fan-Bing Meng^{1

2}, Qiao Wang³, Zheng-Wu Wang², Da-Yu Liu¹

Affiliations

¹ College of Food and Biological Engineering, Chengdu University, Chengdu 610106, PR China.
² Shanghai Jiao Tong University Sichuan Research Institute, Chengdu 610218, PR China.
³ Sichuan Institute of Food Inspection, Chengdu 610097, PR China.

Abstract

Honeysuckle leaves are rich in bioactive ingredients, but often considered as agro-wastes. In this study, honeysuckle leaf extract (HLE) was added to the carboxymethyl konjac glucomannan/konjac glucomannan/gelatin composite edible film (CMKH). Compared to films without HLE addition (CMK), the water vapor barrier properties of CMKH slightly decreased, but the transmittance of the CMKH films in UV region (200-400 nm) as low as zero. The elongation at break of CMKH film was 1.39 ∼ 1.5 fold higher than those of CMK films. The DPPH and ABTS scavenging activity of CMKH-Ⅱ was 85.75% and 90.93%, respectively, which is similar to the equivalent content of Vc. The inhibition rate of CMKH-Ⅰ and CMKH-Ⅱ against Escherichia coli and Listeria monocytogenes were close to 90%, and the inhibition rate against Staphylococcus aureus were up to 96%. The results emphasized that the composite film containing 25% (v/v) HLE has potential application value in food preservation.

Keywords: Bioactive edible film; Carboxymethyl konjac glucomannan; Gelatin; Honeysuckle leaf extract.