2024年1月,南京財經(jīng)大學(xué)食品科學(xué)與工程學(xué)院湯曉智、汪振炯在期刊INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES(Q1,IF: 8.2)發(fā)表題為“Preparation and characterization of starch/PBAT film containing hydroxypropyl-β-cyclodextrin/ethyl lauroyl arginate/cinnamon essential oil microcapsules and its application in the preservation of strawberry”的研究性論文。

本研究主要目的是通過添加HPCD/LAE/CEO/MD微膠囊制備抗菌淀粉/PBAT薄膜,并評價其對草莓的保鮮效果。用羥丙基-β-環(huán)糊精/月桂酰精氨酸乙酯鹽酸鹽(HPCD/LAE)包合物穩(wěn)定肉桂精油(CEO)納米乳液,然后與麥芽糊精(MD)溶液混合。將混合物噴霧干燥成HPCD/LAE/CEO/MD微膠囊,通過擠壓吹膜法制備了含有HPCD/LAE/CEO/MD微膠囊的淀粉/PBAT膜。對微膠囊和膜的結(jié)構(gòu)、性能和抗菌活性進(jìn)行了表征,并探究了含有HPCD/LAE/CEO/MD微膠囊的淀粉/PBAT膜對草莓保鮮的效果。該研究可為可降解淀粉抗菌膜的相關(guān)研究提供技術(shù)參考。
研究亮點(diǎn)
1.采用HPCD/LAE包合物穩(wěn)定肉桂精油納米乳液。
2.將納米乳液噴霧干燥成微膠囊,并加入淀粉/PBAT膜中。
3.微膠囊的添加顯著提高了膜的力學(xué)性能和抗菌性能。
4.含有微膠囊的膜有效地延長了草莓的保質(zhì)期。
研究結(jié)論
當(dāng)配方為4% HPCD/LAE-3%CEO-9%MD (HL-3C-MD)時,微膠囊粒徑最小(3.3 μm),CEO包封率最高(84.51%),抗菌效果最佳。微膠囊(HL-3C-MD)可以填充在淀粉/PBAT膜基質(zhì)的界面空隙中,增加了膜結(jié)構(gòu)的致密性,提升了薄膜的機(jī)械性能,在保持較好斷裂伸長率(243.92%)的同時,還提升了膜的阻水、阻氧性能,同時表現(xiàn)出優(yōu)良的抗菌活性。HL-3C-MD-SP的包裝有效降低了草莓在儲存期間的失重率(49.03%)、腐爛率(40.59%),保持較好的硬度和可溶性固形物含量,對霉菌(2.936 log CFU/g)和細(xì)菌(2.474 log CFU/g)都有很好的抑制效果,提升了草莓品質(zhì),延長了草莓的貨架期。
圖文賞析

Fig. 1. Schematic illustration for the preservation of strawberry with starch/PBAT films containing HPCD/LAE/CEO/MD microcapsules. A: The preparation of the HPCD/LAE complex; B: The preparation of HPCD/LAE/CEO/MD nanoemulsions; C: The preparation of HPCD/LAE/CEO/MD microcapsules and the starch/PBAT films containing microcapsules.

Fig. 2. A: SEM images (a: HL-3C-MD; b: HL-3C2M-MD; c: HL-3C4M-MD; d: HL-5C2M-MD); B: Fluorescent images of microcapsules (a: HL-3C-MD; b: HL-3C2M-MD; c: HL-3C4M-MD; d: HL-5C2M-MD).

Fig. 3. A: Particle size of microcapsules; B: Encapsulation efficiency of microcapsules; C: TG curves of microcapsules; D: Antimicrobial diameter of microcapsules (S. aureus).

Fig. 4. SEM images of films (a: SP film; b: HL-3C-MD-SP film).

Fig. 5. A: Thickness of films; B: Water vapor permeability (WVP); C: Elongation at break (EAB); D: Oxygen permeability (OP); Antibacterial growth curve of films against E. coli (E) and S. aureus (F). Different lowercase letters indicate significant differences (p < 0.05).

Fig. 6. Appearance of strawberries.

Fig. 7. A: Weight loss; B: Decay index; C: Firmness; D: TSS of strawberries during storage; Total number of colonies (E) and molds (F) of strawberries during storage. Different lowercase letters indicate significant differences (p < 0.05).
原文鏈接:http://doi.org/10.1016/j.ijbiomac.2024.129204