CN114573884A - 一种天然可食用果蔬保鲜包装膜的制备方法及应用 - Google Patents
一种天然可食用果蔬保鲜包装膜的制备方法及应用 Download PDFInfo
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Abstract
本发明公开了一种天然可食用果蔬保鲜包装膜的制备方法及应用,包括:将有机酸和氯化胆碱的低共熔溶剂按超声辅助提取苹果渣粉、茶渣粉或姜黄粉,离心收集提取液,得到富含多酚的CNDES提取物;将富含多酚的CNDES提取物与壳聚糖的乙酸溶液,于40~60℃下搅拌2~4h,制得成膜液;将成膜液倒入模具中流延成膜,静置,干燥,得到富含多酚的CNDES壳聚糖保鲜膜,即为天然可食用果蔬保鲜包装膜。本发明天然可食用果蔬保鲜包装膜这种保鲜膜能延长果蔬的贮存时间,成本较低且安全环保。此外,以CNDES负载天然多酚提取物的壳聚糖基保鲜膜,具有较好的机械性能。
Description
技术领域
本发明涉及食品保鲜领域,具体涉及一种天然可食用果蔬保鲜包装膜的制备方法及应用。
背景技术
果蔬在贮藏和加工过程中因褐变、微生物污染引起的损伤量很高,在很大程度上限制了果蔬加工与应用,因此,研究果蔬的保鲜技术具有十分重要的意义。
食品包装材料以其使用方便、成本低等优点在果蔬的保鲜方面得到广泛应用。近年来,市面上大量包装材料多使用高分子聚合物如聚氯乙烯、聚丙烯、聚苯乙烯等制成,这些材料在自然界中不仅难以降解,而且造成白色污染,导致大量资源浪费。利用可再生资源制备保鲜膜已成为一种新的趋势。多糖作为可降解的生物聚合物,正受到人们关注,特别是壳聚糖。壳聚糖来源广泛,同时利用壳聚糖制成的保鲜膜既可以用作可食用的生物降解材料,又能够实现虾壳废料的再利用,加之出色的成膜能力和抗菌性能,使其成为一种理想的食品包装材料。
目前用壳聚糖基材料制备复合膜用于果蔬保鲜的方法有很多种,包括层叠、负载纳米粒子等。专利CN 110746658B公开了一种壳聚糖/曲酸/氯代曲酸复合抑菌保鲜膜,所述复合抑菌保鲜膜包括两层叠设置复合膜,分别为壳聚糖与曲酸复合膜述、壳聚糖与氯代曲酸复合膜,该保鲜膜具有良好的成膜性和机械性能,有较低的水蒸气透过系数和良好的抑菌活性,但其不能有效抑制由鲜切果蔬中的酚酶类物质引起的褐变,且制备工艺较复杂。专利CN110558376A公开了一种壳聚糖-Zn复合物纳米粒子保鲜膜及其制备方法和用途。保鲜膜包括将制备的纳晶纤维素、淀粉溶液和甘油混合,混合得到的成膜液通过常规方法制成保鲜膜。该保鲜膜可用于食品包装和水果保鲜,起到杀菌作用。
然而,壳聚糖基复合膜制备过程中常需要加入大量塑化剂以改善其机械性能,常见的包括甘油、乙二醇等。这些塑化剂的添加会降低壳聚糖本身的有益特性,比如抗菌活性。胆碱类天然低共熔溶剂(CNDES)主要由氢键供体(常为有机酸)和氢键配体氯化胆碱组成,其中氯化胆碱,是一种胆碱衍生物,价格低廉,其加工及储运性能稳定,是理想的营养强化剂。而有机酸比如柠檬酸、抗坏血酸是常见的食品保鲜剂。研究表明,CNDES不仅能作为很好的提取溶剂,能够有效的提取果渣、茶渣中的多酚的活性成分;而且由于氢键的作用能够提高这些活性成分的储藏稳定性;更为重要的是CNDES被证实在壳聚糖基膜的制备过程中能起到很好的塑化剂作用,而膜基材又能使活性成分达到缓释的效果。因此,将富含多酚提取物的CNDES应用于壳聚糖膜的制备,不仅能赋予或增强其抗氧化、抗菌的活性,达到保鲜效果,而且也可能部分甚至完全替代常见塑化剂的添加,改善其机械性能。
发明内容
本发明的目的在于克服上述不足之处,提供一种天然可食用果蔬保鲜包装膜的制备方法及应用,这种保鲜膜能延长果蔬的贮存时间,成本较低且安全环保。此外,以CNDES负载天然多酚提取物的壳聚糖基保鲜膜,具有较好的机械性能。
下面对本发明的技术方案进行具体说明:
本发明提供了一种应用于鲜切果蔬的改性壳聚糖薄膜及其制备方法,包括:
(1)将有机酸和氯化胆碱混合,置于50℃~70℃水浴锅中搅拌10~40min,至熔融状态后磁力搅拌,制得有机酸和氯化胆碱的低共熔溶剂(CNDES);
(2)将步骤(1)获得的有机酸和氯化胆碱的低共熔溶剂(CNDES)(水分含量为10~50%CNDES)按超声辅助提取苹果渣粉、茶渣粉或姜黄粉,离心收集提取液,得到富含多酚的CNDES提取物;
(3)制备壳聚糖的乙酸溶液;
(4)将步骤(2)中得到的富含多酚的CNDES提取物与步骤(3)中壳聚糖的乙酸溶液,于40~60℃下搅拌2~4h,制得成膜液;
(5)步骤(4)得到的成膜液倒入模具中流延成膜,静置,室温干燥,得到富含多酚的CNDES壳聚糖保鲜膜。
作为优选,步骤(1)中,所述的有机酸为抗坏血酸、丙二酸、酒石酸或柠檬酸。所述的有机酸和氯化胆碱的摩尔比为1~2:1~2。置于55℃~65℃水浴锅中搅拌10~30min。至熔融状态后磁力搅拌1~2h。
氯化胆碱的氢键配体有机酸选取抗坏血酸,且抗坏血酸与氯化胆碱按摩尔比为1:2的比例混合,置于60℃水浴锅中搅拌20min,至熔融状态后磁力搅拌1.5h。
作为优选,步骤(2)中,辅助提取的条件为:固液比1:10~20(g:mL)、温度40-60℃,超声功率为300w~600w,时间为30~90min。
所述的苹果渣粉、茶渣粉或姜黄粉的颗粒大小为100~400目(优选200目)。
将CNDES的水分含量25%、固液比1:15、提取温度50℃,超声(450w)辅助提取茶渣粉(200目)60min,离心收集提取液。
作为优选,步骤(3)中,所述的壳聚糖的乙酸溶液的制备包括:
将壳聚糖溶于含质量百分数0.5~2%(优选为1%)的乙酸水溶液,于40~60℃下搅拌1~2h,制备质量百分数1~2%壳聚糖的乙酸溶液;
进一步优选,50℃下搅拌2h,制备2%的壳聚糖乙酸溶液。
作为优选,步骤(4)中,所述的富含多酚的CNDES提取物与壳聚糖的乙酸溶液的质量比为1:1~2。
按照质量比为1:1,将步骤(2)中得到的富含多酚的CNDES提取物与步骤(2)中得到的壳聚糖的乙酸溶液混合,50℃下搅拌2h。
作为优选,步骤(5)中,所述涂布过程中控制涂膜液的用量,优选涂膜液用量为10mL,使得所得改性壳聚糖复合膜的厚度为10~30μm。
本发明以壳聚糖为主要成膜材料,以负载多酚的天然胆碱类低共熔溶剂为塑化剂、抗氧化和抗菌剂,对壳聚糖进行改性,以流延法制备保鲜膜,使得以壳聚糖为基材制备的保鲜膜能有效延缓果蔬的酶促褐变,延长保质期,在食品包装中具有较好的应用前景。
与现有技术相比,本发明具有如下优点:
(1)本发明制备一种绿色可降解果蔬保鲜包装膜,优点在于用天然胆碱类低共熔溶剂(CNDES)作为多酚(比如苹果多酚、茶多酚或姜黄素)的提取剂和稳定剂,从果渣、茶渣或姜黄中提取后,无需溶剂的蒸发,将多酚提取物与CNDES作为一个整体对壳聚糖膜进行改性,能同时起到塑化剂、抗氧化和抗菌剂的作用,不仅能防止常见塑化剂添加引起的壳聚糖膜本身抗菌等功能活性的下降,而且能显著改善壳聚糖薄膜的机械特性,同时壳聚糖薄膜对多酚化合物能起到保护和缓释的效果,对鲜切果蔬能起到良好的保鲜作用。
(2)本发明通过富含多酚提取物的CNDES与壳聚糖复配制成保鲜膜,不仅能通过抑制鲜切果蔬的酶促褐变、微生物的生长,维持贮存品质,而且作为一种安全环保的可降解包装,不会对环境造成污染,同时充分利用了果蔬、茶叶加工的副产物,提高其附加值。
具体实施方式
下面结合具体实施例对本发明进行进一步描述,但本发明的保护范围并不仅限于此:
实施例1:
(1)将抗坏血酸与氯化胆碱按摩尔比为1:2的比例混合,置于60℃水浴锅中搅拌20min,至熔融状态后磁力搅拌1.5h。
(2)将水分含量25%的CNDES用于提取茶渣粉(200目)中的茶多酚,提取条件:超声450w、固液比1:15、提取温度50℃,时间60min,离心收集提取液。
(3)按照质量比为1:1,将步骤(2)中得到的富含茶多酚的CNDES提取物与2%壳聚糖的乙酸溶液混合,50℃下搅拌2h,得到涂膜液。
(4)将上述壳聚糖涂膜液在模具中流延成膜,静置,室温25℃干燥,得到富含茶多酚的CNDES改性的壳聚糖保鲜膜。
实施例2:
(1)将抗坏血酸与氯化胆碱按摩尔比为1:2的比例混合,置于60℃水浴锅中搅拌20min,至熔融状态后磁力搅拌1.5h。
(2)将水分含量25%的CNDES用于提取苹果渣粉(200目)中的苹果多酚,提取条件:超声450w、固液比1:15、提取温度50℃,时间60min,离心收集提取液。
(3)按照质量比为1:1,将步骤(2)中得到的富含苹果多酚的CNDES提取物与2%壳聚糖的乙酸溶液混合,50℃下搅拌2h,得到涂膜液。
(4)将上述壳聚糖涂膜液在模具中流延成膜,静置,室温25℃干燥,得到富含苹果多酚的CNDES改性的壳聚糖保鲜膜。
实施例3:
(1)将抗坏血酸与氯化胆碱按摩尔比为1:2的比例混合,置于60℃水浴锅中搅拌20min,至熔融状态后磁力搅拌1.5h。
(2)将水分含量25%的CNDES用于提取姜黄粉(200目)中的姜黄素,提取条件:超声450w、固液比1:15、提取温度50℃,时间60min,离心收集提取液。
(3)按照质量比为1:1,将步骤(2)中得到的富含姜黄素的CNDES提取物与2%壳聚糖的乙酸溶液混合,50℃下搅拌2h,得到涂膜液。
(4)将上述壳聚糖涂膜液在模具中流延成膜,静置,室温25℃干燥,得到富含姜黄素的CNDES改性的壳聚糖保鲜膜。
实施例4:
(1)将柠檬酸与氯化胆碱按摩尔比为1:1的比例混合,置于60℃水浴锅中搅拌20min,至熔融状态后磁力搅拌1.5h。
(2)将水分含量25%的CNDES用于提取姜黄粉(200目)中的姜黄素,提取条件:超声450w、固液比1:15、提取温度50℃,时间60min,离心收集提取液。
(3)按照质量比为1:1,将步骤(2)中得到的富含姜黄素的CNDES提取物与2%壳聚糖的乙酸溶液混合,50℃下搅拌2h,得到涂膜液。
(4)将上述壳聚糖涂膜液在模具中流延成膜,静置,室温25℃干燥,得到富含姜黄素的CNDES改性的壳聚糖保鲜膜。
实施例5:
(1)将柠檬酸与氯化胆碱按摩尔比为1:1的比例混合,置于60℃水浴锅中搅拌20min,至熔融状态后磁力搅拌1.5h。
(2)将水分含量25%的CNDES用于提取苹果渣粉(200目)中的苹果多酚,提取条件:超声450w、固液比1:15、提取温度50℃,时间60min,离心收集提取液。
(3)按照质量比为1:1,将步骤(2)中得到的富含苹果多酚的CNDES提取物与2%壳聚糖的乙酸溶液混合,50℃下搅拌2h,得到涂膜液。
(4)将上述壳聚糖涂膜液在模具中流延成膜,静置,室温25℃干燥,得到富含苹果多酚的CNDES改性的壳聚糖保鲜膜。
实施例6:
(1)将柠檬酸与氯化胆碱按摩尔比为1:2的比例混合,置于60℃水浴锅中搅拌20min,至熔融状态后磁力搅拌1.5h。
(2)将水分含量25%的CNDES用于提取姜黄粉(200目)中的姜黄素,提取条件:超声450w、固液比1:15、提取温度50℃,时间60min,离心收集提取液。
(3)按照质量比为1:1,将步骤(2)中得到的富含姜黄素的CNDES提取物与2%壳聚糖的乙酸溶液混合,50℃下搅拌2h,得到涂膜液。
(4)将上述壳聚糖涂膜液在模具中流延成膜,静置,室温25℃干燥,得到富含姜黄素的CNDES改性的壳聚糖保鲜膜。
实施例7:
(1)将酒石酸与氯化胆碱按摩尔比为1:2的比例混合,置于60℃水浴锅中搅拌20min,至熔融状态后磁力搅拌1.5h。
(2)将水分含量25%的CNDES用于提取姜黄粉(200目)中的姜黄素,提取条件:超声450w、固液比1:15、提取温度50℃,时间60min,离心收集提取液。
(3)按照质量比为1:1,将步骤(2)中得到的富含姜黄素的CNDES提取物与2%壳聚糖的乙酸溶液混合,50℃下搅拌2h,得到涂膜液。
(4)将上述壳聚糖涂膜液在模具中流延成膜,静置,室温25℃干燥,得到富含姜黄素的CNDES改性的壳聚糖保鲜膜。
实施例8:
(1)将酒石酸与氯化胆碱按摩尔比为1:2的比例混合,置于60℃水浴锅中搅拌20min,至熔融状态后磁力搅拌1.5h。
(2)将水分含量25%的CNDES用于提取苹果渣粉(200目)中的苹果多酚,提取条件:超声450w、固液比1:15、提取温度50℃,时间60min,离心收集提取液。
(3)按照质量比为1:1,将步骤(2)中得到的富含苹果多酚的CNDES提取物与2%壳聚糖的乙酸溶液混合,50℃下搅拌2h,得到涂膜液。
(4)将上述壳聚糖涂膜液在模具中流延成膜,静置,室温25℃干燥,得到富含苹果多酚的CNDES改性的壳聚糖保鲜膜。
实施例9:
(1)将酒石酸与氯化胆碱按摩尔比为1:2的比例混合,置于60℃水浴锅中搅拌20min,至熔融状态后磁力搅拌1.5h。
(2)将水分含量25%的CNDES用于提取姜黄粉(200目)中的姜黄素,提取条件:超声450w、固液比1:15、提取温度50℃,时间60min,离心收集提取液。
(3)按照质量比为1:1,将步骤(2)中得到的富含姜黄素的CNDES提取物与2%壳聚糖的乙酸溶液混合,50℃下搅拌2h,得到涂膜液。
(4)将上述壳聚糖涂膜液在模具中流延成膜,静置,室温25℃干燥,得到富含姜黄素的CNDES改性的壳聚糖保鲜膜。
Claims (10)
1.一种天然可食用果蔬保鲜包装膜的制备方法,其特征在于,包括以下步骤:
(1)将有机酸和氯化胆碱混合,置于50℃~70℃水浴锅中搅拌10~40min,至熔融状态后磁力搅拌,制得有机酸和氯化胆碱的低共熔溶剂;
(2)将步骤(1)获得的有机酸和氯化胆碱的低共熔溶剂按超声辅助提取苹果渣粉、茶渣粉或姜黄粉,离心收集提取液,得到富含多酚的CNDES提取物;
(3)制备壳聚糖的乙酸溶液;
(4)将步骤(2)中得到的富含多酚的CNDES提取物与步骤(3)中壳聚糖的乙酸溶液,于40~60℃下搅拌2~4h,制得成膜液;
(5)步骤(4)得到的成膜液倒入模具中流延成膜,静置,干燥,得到富含多酚的CNDES壳聚糖保鲜膜,即为天然可食用果蔬保鲜包装膜。
2.根据权利要求1所述的天然可食用果蔬保鲜包装膜的制备方法,其特征在于,步骤(1)中,所述的有机酸为抗坏血酸、丙二酸、酒石酸或柠檬酸。
3.根据权利要求1所述的天然可食用果蔬保鲜包装膜的制备方法,其特征在于,步骤(1)中,所述的有机酸和氯化胆碱的摩尔比为1~2:1~2。
4.根据权利要求1所述的天然可食用果蔬保鲜包装膜的制备方法,其特征在于,步骤(1)中,置于55℃~65℃水浴锅中搅拌10~30min,至熔融状态后磁力搅拌1~2h。
5.根据权利要求1所述的天然可食用果蔬保鲜包装膜的制备方法,其特征在于,步骤(2)中,辅助提取的条件为:固液比1:10~20、温度40-60℃,超声功率为300w~600w,时间为30~90min。
6.根据权利要求1所述的天然可食用果蔬保鲜包装膜的制备方法,其特征在于,步骤(2)中,所述的苹果渣粉、茶渣粉或姜黄粉的颗粒大小为100~400目。
7.根据权利要求1所述的天然可食用果蔬保鲜包装膜的制备方法,其特征在于,步骤(3)中,所述的壳聚糖的乙酸溶液的制备包括:
将壳聚糖溶于含质量百分数0.5~2%的乙酸水溶液,于40~60℃下搅拌1~2h,制备质量百分数1~2%壳聚糖的乙酸溶液。
8.根据权利要求1所述的天然可食用果蔬保鲜包装膜的制备方法,其特征在于,步骤(4)中,所述的富含多酚的CNDES提取物与壳聚糖的乙酸溶液的质量比为1:1~2。
9.根据权利要求1所述的天然可食用果蔬保鲜包装膜的制备方法,其特征在于,步骤(5)中,所述的富含多酚的CNDES壳聚糖保鲜膜的厚度为10~30μm。
10.根据权利要求1~9任一项所述的制备方法制备的天然可食用果蔬保鲜包装膜在果蔬保鲜中的应用。
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