CN106071634A - 一种蓝莓汁稳定剂及提高蓝莓汁稳定性的方法 - Google Patents
一种蓝莓汁稳定剂及提高蓝莓汁稳定性的方法 Download PDFInfo
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Abstract
本发明提供了一种蓝莓汁稳定剂及其制备方法,属于果汁稳定剂技术领域,所述蓝莓汁稳定剂为乙酸乙酯萃取含有NaHCO3的绿茶浸提液得到的水相溶液或所述水相溶液经过干燥得到的绿茶水提物。所述稳定剂的制备方法包括用50~80℃的热水浸提碎绿茶,得到绿茶浸提液;在绿茶浸提液中加入NaHCO3;用乙酸乙酯萃取绿茶浸提液;取萃取后的水相溶液干燥等步骤。在蓝莓汁中添加上述蓝莓汁稳定剂后,蓝莓汁的稳定性显著提升;同时,也能够减少蓝莓汁中还原性物质的氧化和分解,增加了蓝莓汁的抗氧化能力。添加本发明的稳定剂制得的蓝莓汁具有花色苷稳定性高,抗氧化能力强,果汁呈红色,澄清透明,且营养价值高等特点。
Description
技术领域
本发明属于果汁稳定剂及提高果汁稳定性的领域,具体涉及一种蓝莓汁稳定剂及提高蓝莓汁稳定性方法。
背景技术
蓝莓又称越橘,杜鹃花科越橘属多年生落叶或常绿灌木,分布于亚寒带、温带及亚热带。蓝莓果实为浆果,果肉细腻,酸甜适度,既可以鲜食,也可以加工成果汁饮料、果酒饮品等。果胶酶是指能够分解果胶物质的多种酶的总称。目前,酶解技术在果汁加工中已得到广泛应用,采用酶解技术可以破坏植物细胞壁中果胶物质、纤维素和半纤维素,使细胞间的交联断裂,促进细胞中可溶性物质流出,从而大大提高了果汁出汁率。
蓝莓除含常规的营养成分外,还含有丰富的花青素。经研究发现,花青素具有保护和改善视力、治疗心血管疾病、预防肥胖、防止脑神经老化、预防癌症等功能。但是花青素的稳定性容易受多种因素影响,现有文献已经报道了花青素具有不稳定性。
Fan Gongjian等在“Composition and colour stability of anthocyaninsextracted from fermented purple sweet potato culture”一文中研究认为红薯中花青素在酸性条件下(pH 2~4)比微酸条件(pH 5~6)下更稳定。Daniela等研究认为,野生蓝莓中的花青素在25℃时稳定性最好,当温度超过60℃时稳定性较差。Kopjar等在“Influenceof sugars and chlorogenic acid addition on anthocyanin content,antioxidantactivity and color of blackberry juice during storage”一文中研究认为,在黑莓果汁中加入糖可以增加花青素的稳定性。Fischer等在“Thermal stability of anthocyanins and colourless phenolics in pomegranate(Punica granatum L)juicesand model solutions”一文中认为石榴汁中花青素的稳定性与果汁中的总酚含量、有机酸、糖有关。Augustine等在“Effect of combined preservation techniques on thestability and microbial quality and retention of anthocyanins in grape pomacestored at low temperature”中报道,苯甲酸钠可以增加葡萄皮中花青素的稳定性。石光等在《蓝莓花色苷稳定性研究》一文中报道花青素在光照,尤其是紫外光条件下不稳定。李颖畅等在“金属离子和食品添加剂对蓝莓花色苷稳定性的影响”一文中研究发现Ca2+、Cu2+对花色苷的稳定性无显著影响;Fe2+、Fe3+对花色苷具有破坏作用,使花色苷的稳定性下降。但是关于蓝莓果汁中花青素的稳定性研究还未见报道。
蓝莓汁中含有高含量的活性成分花色苷,花色苷在存放过程中不稳定,不仅可导致色泽的劣变,且其清除自由基等功能也会随着存放时间的延长逐渐下降,从而降低了蓝莓汁的营养价值,因此需要寻找一种简便且有效的方法提高蓝莓汁的稳定性。申请人在研究中发现,将茶叶水提物添加到蓝莓果汁中,可以显著提高蓝莓果汁的稳定性,本发明提供了一种全新的蓝莓汁稳定剂和提高蓝莓汁稳定性的方法。
发明内容
本发明提供了一种全新的蓝莓汁稳定剂,所述蓝莓汁稳定剂为乙酸乙酯萃取含有NaHCO3的绿茶浸提液得到的水相溶液或所述水相溶液经过干燥得到的绿茶水提物。
同时,本发明还提供了所述蓝莓汁稳定剂的制备方法,具体制备方法包括如下步骤:
①用50~80℃的热水浸提碎绿茶,得到绿茶浸提液。
②在绿茶浸提液中加入NaHCO3。
③用乙酸乙酯萃取绿茶浸提液。
④取萃取后的水相溶液,干燥得到所述蓝莓汁稳定剂。
进一步,所述NaHCO3的添加量为0.05~0.2%(m/v)。
进一步,所述用50~80℃的热水浸提经碎绿茶具体为:将碎绿茶按照料液比1:10~1:80(kg/L)于50~80℃热水中浸提15~150min。
进一步,所述萃取后的绿茶水相溶液的干燥方法具体为:将萃取后的水相溶液溶液进行减压干燥或喷雾干燥或冷冻干燥。
同时,本发明还提供一种提高蓝莓汁稳定性的方法,所述提高蓝莓汁稳定性的方法具体为在蓝莓汁中添加上述蓝莓汁稳定剂。
进一步,所述蓝莓汁稳定剂的添加量为0.01~0.3%(m/v)。
其中,所述蓝莓汁是将蓝莓果置于90-100℃的水中烫漂1-10min或利用水蒸气烫漂1-5min,并经过酶解及压榨过滤得到的蓝莓汁。
有益效果
本发明中在蓝莓汁中添加了绿茶水提物作为稳定剂,显著减少了蓝莓汁中花色苷的降解,更大程度上保留了果汁中的花色苷,同时,稳定剂加入后,显著的提高蓝莓全汁或蓝莓汁饮料的色泽,见图1,图1为添加稳定剂与不添加稳定剂的蓝莓汁存放20天后颜色对比图。其中,A为实施例组,添加了稳定剂,B为对照组,未添加稳定剂。本发明的稳定剂也能够减少蓝莓汁中还原性物质的氧化分解,增加了蓝莓汁的抗氧化能力,数据见实施例1。
由于本发明方案中绿茶水提物为混合物,成分复杂,其增强蓝莓汁稳定性的机理根据现有文献判断,可能是绿茶水提物与蓝莓汁花色苷分子间的络合机制所致,即花色苷和绿茶水提物形成π-π分子间络合,通过电荷的转移实现电荷的重排,从而通过疏水作用力结合在一起,保护了黄烊盐离子的存在,稳定了蓝莓汁花色苷和颜色。而常见的绿茶水浸提物中可能是含有其他破坏此分子络合稳定性的物质,所以没有显著的增强蓝莓汁稳定性的效果。
本发明制得蓝莓汁具有花色苷稳定性高,抗氧化能力强,色泽呈红色,澄清透明且营养价值高等特点。
附图说明
图1:实施例组与对照组的蓝莓汁存放20天后颜色对比图。
具体实施方式
下面结合具体实施例子进一步阐明本发明,应理解这些实施例仅用于说明本发明,而不用于限制本发明的范围,在阅读了本发明之后,本领域的技术人员对本发明各种等价形式的修改均落于本申请所附权利要求所规定的范围。
实施例1
一种提高蓝莓汁稳定性方法,具体步骤如下:
1.绿茶预处理:选取绿茶原料,经粉碎,得到碎绿茶。
2.浸提经碎绿茶:准确称取1kg绿茶粉加入10L温度为80℃的热水中浸提15min。
3.减压抽滤:浸提碎绿茶步骤完成后,固液分离,得到浸提后的绿茶渣和绿茶浸提液。
4.萃取绿茶浸提液:将绿茶浸提液加入0.05%(m/v)的NaHCO3,混合溶解后,加入乙酸乙酯充分混合萃取,分离得到水相和乙酸乙酯相,重复萃取2次,得到绿茶乙酸乙酯萃取液和萃取后的水相溶液。
5.干燥:将萃取后的水相溶液进行喷雾干燥,得到绿茶水提物,即本发明的蓝莓汁稳定剂。
6.蓝莓预处理:将解冻后的蓝莓果或鲜蓝莓果在温度96℃的水中烫漂5min;加入果胶酶酶解后压榨过滤得到蓝莓汁。
7.添加稳定剂:取上述绿茶水提物作为蓝莓汁的稳定剂,在蓝莓汁中添加0.07%(m/v)的绿茶水提物,平衡静置2~12h后,灌装密封,在85℃杀菌5min,冷却得到具有高稳定性的蓝莓汁。
申请人做了如下检测和对比实验:
对照组:按照本实施例步骤6,7的方法制备蓝莓汁,区别在于不添加步骤7中所述稳定剂,3组平行分别为对照组1,对照组2,对照组3。
实施例组:按照本实施例中提高蓝莓汁稳定性方法,加入0.07%(m/v)上述稳定剂。3组平行分别为实施例组1,实施例组2,实施例组3。
为考察本发明的蓝莓汁中有效成分的稳定性,申请人将实施例组和对照组置于40℃的条件下进行加速试验,贮藏20天后测定其花色苷保留率、DPPH抗氧化能力和FRAP抗氧化能力,其中,使用分光光度计比色法对对照组和实施例组的蓝莓汁的花色苷含量和抗氧化能力进行测定,使用Color Quest XE色差仪对对照组和实施例组的蓝莓汁进行颜色测定。花色苷含量按照pH示差法,花色苷保留率%=存放后蓝莓汁花色苷含量/存放前蓝莓汁花色苷含量;抗氧化能力采用DPPH自由基清除能力和FRAP法评定,其结果如下:
表1为对照组和实施例组花色苷保留率和抗氧化能力对比,保留率越大和抗氧化值越高则表明蓝莓汁的稳定性越好。表2为对照组和实施例组亮度L、饱和度C和色度角H°的对比,L*表示溶液的亮度,C表示饱和度,数值越大,颜色越饱满。H°表示色度角,0°表示红色,90°表示黄色。
表1添加稳定剂与不添加的花色苷保留率和抗氧化能力比较
表2添加稳定剂与不添加的色泽数据表
样品 | 对照组1 | 对照组2 | 对照组3 | 实施例组1 | 实施例组2 | 实施例组3 |
L | 13.16 | 13.22 | 13.24 | 12.59 | 12.6 | 12.59 |
C | 48.16 | 47.3 | 48.31 | 50.20 | 50.99 | 51.00 |
H° | 28.49 | 29.79 | 28.82 | 26.81 | 25.71 | 25.73 |
表1为本发明的实施例组与对照组的蓝莓汁稳定性数据表,图1为添加稳定剂(A:实施例组)与不添加稳定剂(B:对照组)的蓝莓汁色泽比较。由上表1可见,在40℃贮藏20d后,实施例组花色苷保留率和抗氧化能力均显著高于对照组。表2数据反映的是蓝莓汁的色泽稳定性,结合表2的数据和图1可以看出,与对照组相比,实施例组的蓝莓汁色泽深红且澄清,可以看出,实施例组蓝莓汁显著保留花色苷原有的深红明亮的特点,而对照组则颜色较淡,由此可见实施例组蓝莓汁的稳定性有很大的提升。
申请人又将本实施例步骤3得到的绿茶浸提液喷雾干燥,得到绿茶浸提物粉末,作为稳定剂添加到蓝莓汁中,按照上述方法做了对照实验,在40℃的条件下贮藏20天后,其抗氧化性和花色苷保留率如下表,由下表可知,只有经过乙酸乙酯萃取后剩余的水相具有提高蓝莓汁稳定性的作用,而没有经过萃取的绿茶浸提粉对蓝莓汁的稳定性提升不明显。
表3添加绿茶浸提粉花色苷保留率和抗氧化能力表
实施例2
一种提高蓝莓汁稳定性方法,具体步骤如下:
1.绿茶预处理:选取绿茶原料,经粉碎,过20目筛,得到碎绿茶。
2.浸提碎绿茶:准确称取1kg绿茶粉加入80L温度为50℃的热水中浸提150min。
3.固液分离:浸提碎绿茶步骤完成后,固液分离,得到浸提后的绿茶渣和绿茶浸提液。
4.萃取绿茶浸提液:将绿茶浸提液加入0.2%(m/v)的NaHCO3,混合溶解后,加入乙酸乙酯充分混合萃取,分离得到水相和乙酸乙酯相,重复萃取2次,得到绿茶乙酸乙酯萃取液和萃取后的水相溶液
5.干燥:将萃取后的水相溶液进行冷冻干燥,得到绿茶水提物,即本发明的蓝莓汁稳定剂。
6.蓝莓预处理:将解冻后的蓝莓果或鲜蓝莓果在温度90℃的水中烫漂10min;加入果胶酶酶解后压榨过滤得到蓝莓汁。
7.添加稳定剂:取上述绿茶水提物作为蓝莓汁的稳定剂,在蓝莓汁中添加0.01(m/v)的绿茶水提物,平衡静置2~12h后,灌装密封,在95℃杀菌1min,冷却得到具有高稳定性的蓝莓汁。
实施例3
一种提高蓝莓汁稳定性方法,具体步骤如下:
1.绿茶预处理:选取绿茶原料,经粉碎,得到碎绿茶。
2.浸提碎绿茶:准确称取1kg绿茶粉加入30L温度为70℃的热水中浸提90min。
3.固液分离:浸提碎绿茶的步骤完成后,固液分离,得到浸提后的绿茶渣和绿茶浸提液。
4.萃取绿茶浸提液:在绿茶浸提液中加入0.15%(m/v)的NaHCO3混合溶解后,再加入乙酸乙酯充分混合萃取,得到绿茶乙酸乙酯萃取液和萃取后的水相溶液。
5.干燥:将萃取后的水相溶液进行减压干燥,得到绿茶水提物,即本发明的蓝莓汁稳定剂。
6.蓝莓预处理:将解冻后的蓝莓果或鲜蓝莓果在标准大气压下用100℃的水蒸汽烫漂1min,并经过酶解压榨过滤步骤得到蓝莓汁。
7.添加稳定剂:取上述绿茶水提物作为蓝莓汁的稳定剂,在蓝莓汁中添加0.3%(m/v)的绿茶水提物,平衡静置2h后,灌装密封,在90℃杀菌1.5min,冷却后得到具有高稳定性的蓝莓汁。
其中,步骤4得到的萃取后的水相溶液与蓝莓汁混合后,一样可以达到提高蓝莓汁稳定性的效果,但可能会稀释蓝莓汁,对蓝莓汁的浓度造成影响。
Claims (8)
1.一种蓝莓汁稳定剂,其特征在于,所述蓝莓汁稳定剂为乙酸乙酯萃取含有NaHCO3的绿茶浸提液得到的水相溶液或所述水相溶液经过干燥得到的绿茶水提物。
2.一种权利要求1所述蓝莓汁稳定剂的制备方法,其特征在于,所述蓝莓汁稳定剂的制备方法包括:
用50~80℃的热水浸提碎绿茶,得到绿茶浸提液;在绿茶浸提液中加入NaHCO3;用乙酸乙酯萃取绿茶浸提液;取萃取后的水相溶液,干燥得到所述蓝莓汁稳定剂。
3.根据权利要求2所述的蓝莓汁稳定剂的制备方法,其特征在于:所述NaHCO3的添加量为0.05~0.2%(m/v)。
4.根据权利要求2所述的蓝莓汁稳定剂的制备方法,其特征在于:所述用50~80℃的热水浸提经碎绿茶具体为:将碎绿茶按照料液比1:10~1:80(kg/L)于50~80℃热水中浸提15~150min。
5.根据权利要求2所述的蓝莓汁稳定剂的制备方法,其特征在于:所述萃取后的绿茶水相溶液的干燥方法具体为:将萃取后的水相溶液进行减压干燥或喷雾干燥或冷冻干燥。
6.一种提高蓝莓汁稳定性的方法,其特征在于,在蓝莓汁中添加权利要求1所述的蓝莓汁稳定剂。
7.根据权利要求6所述的提高蓝莓汁稳定性的方法,其特征在于:所述蓝莓汁稳定剂的添加量为0.01~0.3%(m/v)。
8.根据权利要求6所述的提高蓝莓汁稳定性的方法,其特征在于:所述蓝莓汁是将蓝莓果置于90-100℃的水中烫漂1-10 min或利用水蒸气烫漂1-5 min,并经过酶解及压榨过滤得到的蓝莓汁。
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