CN116158535B - 一种桑叶蛋白-桑葚花青素复合乳液及其制备方法 - Google Patents
一种桑叶蛋白-桑葚花青素复合乳液及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种桑叶蛋白‑桑葚花青素复合乳液及其制备方法,涉及食品加工技术领域。具体包括以下步骤:(1)制备桑叶蛋白;(2)制备桑叶多糖;(3)制备桑葚花青素提取物;(4)均质制备乳液。本发明利用属于同一植物体系来源的桑叶蛋白、桑叶多糖和桑葚花青素制备乳液,提高了整个乳液体系的稳定性。
Description
技术领域
本发明涉及食品加工技术领域,更具体的说是涉及一种桑叶蛋白-桑葚花青素复合乳液及其制备方法。
背景技术
花青素是一种小分子活性物质,主要包括矢车菊素、飞燕草素、芍药花色素、牵牛花色素等。花青素具有抗氧化、抑菌、抗肿瘤、抗炎等多种功能。但是,花青素在加工和储存过程中对环境条件(如温度、pH、光、水、氧气、金属离子等)的稳定性较低,使其在食品中的应用面临着巨大的挑战。
乳液是食品体系中最复杂也是最重要的体系之一,蛋白质作为乳化剂时常被利用,已有研究表明花青素具有较强的蛋白亲和性,在大豆分离蛋白中添加花青素可以有效提高复合乳液氧化稳定性。花青素和蛋白质结合形成复合物,不仅能提高花青素的稳定性,而且能增强蛋白质的抗氧化能力及其他功能特性。但是通过简单的混合方式很难制备稳定的复合体系。多糖作为乳化稳定剂也常被用来改善体系流变性,多糖对体系的结构及稳定性同样具有重要作用。
桑叶是一种药食两用资源,桑叶中的蛋白质含量高,部分品种桑叶蛋白质含量可以占到干基重量的20%-30%。桑叶蛋白质的氨基酸种类齐全,必需氨基酸含量较高,是一种极具开发价值的可食用植物蛋白原料。近几年对于桑叶蛋白的研究主要是集中在其提取工艺上,关于桑叶蛋白在食品体系中的应用尚未见报道。桑叶蛋白具有较好的起泡性、乳化性和乳化稳定性,具备成为食品级乳化剂的潜力。但是,在提取工艺中的热处理、酶处理等过程,易引起桑叶蛋白理化性质改变,使其开发利用受到一定程度的限制。
桑叶多糖是从桑叶中提取得到的一种活性物质,具有降血糖、降血脂、抗氧化、抗衰老、增强免疫等多种药理作用,在保健品、医药等行业有较高的开发利用价值。目前关于桑叶多糖在稳定食品体系中的应用也鲜见报道。
发明内容
有鉴于此,本发明提供了一种
为了实现上述目的,本发明采用如下技术方案:
一种桑叶蛋白-花青素复合乳液的制备方法,具体包括以下步骤:
(1)先将桑叶进行真空冷冻干燥,粉碎,过40目筛,得到桑叶粉;向桑叶粉中加入0.1mol/L的NaOH溶液,超声提取,第一次离心,收集上清液;调节上清液pH为4.8,待蛋白质产生絮状沉淀后,4℃静置,第二次离心,收集沉淀,上清液备用;用95%乙醇洗涤沉淀,用PBS复溶后在蒸馏水中透析1d,真空冷冻干燥,即得桑叶蛋白;
(2)收集步骤(1)中第二次离心的上清液,调节pH至中性,真空浓缩,加入无水乙醇,4℃静置,使沉淀析出,离心收集沉淀;用蒸馏水溶解沉淀,缓慢滴加到经处理的DEAE-52纤维素层析柱上,用NaCL溶液进行梯度洗脱,收集多糖含量最高的组分,装载到葡聚糖凝胶SephadexG-100柱上,用蒸馏水洗脱,根据峰值收集合并洗脱液,真空冷冻干燥,即得桑叶多糖;
(3)将新鲜桑葚用高速匀浆机打浆,加入酸化乙醇,超声提取,共重复提取2次,合并提取液;将提取液旋蒸除去乙醇,经布氏漏斗抽滤后,上样至装填有AB-8大孔树脂的层析柱,吸附完成后,用蒸馏水和乙酸乙酯洗脱除去杂质,然后用60%酸性乙醇洗脱花青素,收集洗脱液,再次减压浓缩除去有机溶剂,真空冷冻干燥,得到桑葚花青素提取物;
(4)取桑叶蛋白溶解于磷酸盐缓冲液中,热处理后磁力搅拌2h,随后调节pH至7.0,并加入桑葚花青素,室温下磁力搅拌1h,再加入大豆油和桑叶多糖,搅拌1h,最后均质制备乳液。
进一步的,所述步骤(1)中,桑叶与NaOH溶液料液比为g:mL=1:30-50;超声功率300W,提取温度40℃,提取时间20-60min。
进一步的,所述步骤(1)中,桑叶与NaOH溶液料液比优选为g:mL=1:40;超声提取时间优选为45min。
采用上述进一步技术方案的有益效果在于,桑叶蛋白提取率高,蛋白质结构稳定。
进一步的,所述步骤(2)中,真空浓缩的体积为初始体积的1/10-20。
进一步的,所述步骤(2)中,梯度洗脱中NaCL溶液的梯度浓度为0mol/L、0.1mol/L、0.3mol/L、0.5mol/L;
所述多糖含量最高的组分为以0.3mol/L NaCL溶液洗脱的洗脱液。
采用上述进一步技术方案的有益效果在于,获得纯度较高且分子量较小的桑叶多糖。
进一步的,所述步骤(3)中,酸化乙醇为含有0.1%柠檬酸的乙醇溶液;
桑葚浆与酸化乙醇料液比为g:mL=1:2-5,优选为1:3;超声功率300W,提取温度40℃,提取时间20-60min,优选为30min。
进一步的,所述步骤(3)中,桑葚浆与酸化乙醇料液比优选为g:mL=1:3;超声提取时间优选为30min。
采用上述进一步技术方案的有益效果在于,充分提取桑葚花青素。
进一步的,所述步骤(3)中,大孔树脂洗脱所用的蒸馏水体积为层析柱柱体积的1倍,乙酸乙酯体积为层析柱柱体积的1倍,60%酸化乙醇体积为层析柱柱体积的5倍。
采用上述进一步技术方案的有益效果在于,获得高纯度的桑葚花青素。
进一步的,所述步骤(4)中,所述磷酸盐缓冲液的浓度为0.02mol/L;桑叶蛋白的质量浓度为30mg/mL,桑叶蛋白溶液与大豆油的体积比为5:1,桑叶蛋白与花青素的质量比为40:1,桑叶蛋白与桑叶多糖的质量比为5:1;所述的热处理为在80℃条件下水浴10min,均质速度为12000r/min,时间为3min。
采用上述进一步技术方案的有益效果在于,按适度配比添加桑叶多糖,提高桑叶蛋白-花青素复合乳液的稳定性。
本发明还提供上述制备方法得到的桑叶蛋白-花青素复合乳液。
经由上述的技术方案可知,与现有技术相比,本发明的有益效果如下:
1、本发明利用属于同一植物体系来源的桑叶蛋白、桑叶多糖和桑葚花青素制备乳液,提高了整个乳液体系的稳定性。
2、本发明联合提取桑叶蛋白和桑叶多糖,提高了桑树资源的综合利用率。
3、本发明制备的乳液能够提高花青素的热稳定性。
具体实施方式
下面将对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
实施例1
一种桑叶蛋白-桑葚花青素复合乳液的制备方法,具体包括以下步骤:
(1)先将桑叶进行真空冷冻干燥,粉碎,过40目筛,得到桑叶粉。称取桑叶粉20g,加入NaOH溶液(0.1mol/L)800mL,超声45min,超声功率300W,温度40℃,第一次离心,收集上清液,调节上清液pH为4.8,待蛋白质产生絮状沉淀后,4℃静置,第二次离心,收集沉淀用95%乙醇洗涤沉淀,用PBS复溶后在蒸馏水中透析1d,真空冷冻干燥,即得桑叶蛋白。
(2)收集步骤(1)中第二次离心的上清液,调节pH至中性,真空浓缩至100mL,加入无水乙醇,4℃静置,使沉淀析出。离心收集沉淀,用蒸馏水溶解,缓慢滴加到经处理的DEAE-52纤维素层析柱上,用梯度(0、0.1、0.3、0.5mol/L)NaCL溶液进行洗脱,流速为5mL/min,5mL收集一管,采用苯酚-硫酸法测定多糖含量,根据峰值收集以0.3mol/L NaCL溶液洗脱的多糖含量高的洗脱液,装载到葡聚糖凝胶SephadexG-100柱上,以5mL/min流速洗脱,收集洗脱液,每管5mL,用蒸馏水洗脱,根据峰值收集合并洗脱液,真空冷冻干燥,即得桑叶多糖。
(3)新鲜桑葚用高速匀浆机打浆,取桑葚浆200g,加入酸化乙醇600mL,共重复超声提取2次,超声功率300W,提取温度40℃,每次提取30min。合并提取液,旋蒸除去乙醇,经布氏漏斗抽滤后,上样至装填有AB-8大孔树脂的层析柱(直径为2.6cm、高度为60cm),吸附完成后,依次用300mL和300mL乙酸乙酯洗脱除去杂质,然后用1.5L酸性乙醇(60%)洗脱花青素,收集洗脱液,再次减压浓缩除去有机溶剂,真空冷冻干燥,得到桑葚花青素提取物。
(4)取桑叶蛋白1.5g溶解于50mL磷酸盐缓冲液(0.02mol/L)中,在80℃条件下水浴10min,磁力搅拌2h,加入37.5mg桑葚花青素,室温下磁力搅拌1h,再加入大豆油10mL和桑叶多糖0.3g,搅拌1h,然后12000r/min均质3min,得到乳液。
实施例2
一种桑叶蛋白-桑葚花青素复合乳液的制备方法,具体包括以下步骤:
(1)先将桑叶进行真空冷冻干燥,粉碎,过40目筛,得到桑叶粉。称取桑叶粉20g,加入NaOH溶液(0.1mol/L)600mL,超声20min,超声功率300W,温度40℃,第一次离心,收集上清液,调节上清液pH为4.8,待蛋白质产生絮状沉淀后,4℃静置,第二次离心,收集沉淀用95%乙醇洗涤沉淀,用PBS复溶后在蒸馏水中透析1d,真空冷冻干燥,即得桑叶蛋白。
(2)收集步骤(1)中第二次离心的上清液,调节pH至中性,真空浓缩至100mL,加入无水乙醇,4℃静置,使沉淀析出。离心收集沉淀,用蒸馏水溶解,缓慢滴加到经处理的DEAE-52纤维素层析柱上,用梯度(0、0.1、0.3、0.5mol/L)NaCL溶液进行洗脱,流速为5mL/min,5mL收集一管,采用苯酚-硫酸法测定多糖含量,根据峰值收集以0.3mol/L NaCL溶液洗脱的多糖含量高的洗脱液,装载到葡聚糖凝胶SephadexG-100柱上,以5mL/min流速洗脱,收集洗脱液,每管5mL,用蒸馏水洗脱,根据峰值收集合并洗脱液,真空冷冻干燥,即得桑叶多糖。
(3)新鲜桑葚用高速匀浆机打浆,取桑葚浆200g,加入酸化乙醇400mL,共重复超声提取2次,超声功率300W,提取温度40℃,每次提取20min。合并提取液,旋蒸除去乙醇,经布氏漏斗抽滤后,上样至装填有AB-8大孔树脂的层析柱(直径为2.6cm、高度为60cm),吸附完成后,依次用300mL和300mL乙酸乙酯洗脱除去杂质,然后用1.5L酸性乙醇(60%)洗脱花青素,收集洗脱液,再次减压浓缩除去有机溶剂,真空冷冻干燥,得到桑葚花青素提取物。
(4)取桑叶蛋白1.5g溶解于50mL磷酸盐缓冲液(0.02mol/L)中,在80℃条件下水浴10min,磁力搅拌2h,加入37.5mg桑葚花青素,室温下磁力搅拌1h,再加入大豆油10mL和桑叶多糖0.3g,搅拌1h,然后12000r/min均质3min,得到乳液。
实施例3
一种桑叶蛋白-桑葚花青素复合乳液的制备方法,具体包括以下步骤:
(1)先将桑叶进行真空冷冻干燥,粉碎,过40目筛,得到桑叶粉。称取桑叶粉20g,加入NaOH溶液(0.1mol/L)1000mL,超声60min,超声功率300W,温度40℃,第一次离心,收集上清液,调节上清液pH为4.8,待蛋白质产生絮状沉淀后,4℃静置,第二次离心,收集沉淀用95%乙醇洗涤沉淀,用PBS复溶后在蒸馏水中透析1d,真空冷冻干燥,即得桑叶蛋白。
(2)收集步骤(1)中第二次离心的上清液,调节pH至中性,真空浓缩至100mL,加入无水乙醇,4℃静置,使沉淀析出。离心收集沉淀,用蒸馏水溶解,缓慢滴加到经处理的DEAE-52纤维素层析柱上,用梯度(0、0.1、0.3、0.5mol/L)NaCL溶液进行洗脱,流速为5mL/min,5mL收集一管,采用苯酚-硫酸法测定多糖含量,根据峰值收集以0.3mol/L NaCL溶液洗脱的多糖含量高的洗脱液,装载到葡聚糖凝胶SephadexG-100柱上,以5mL/min流速洗脱,收集洗脱液,每管5mL,用蒸馏水洗脱,根据峰值收集合并洗脱液,真空冷冻干燥,即得桑叶多糖。
(3)新鲜桑葚用高速匀浆机打浆,取桑葚浆200g,加入酸化乙醇1000mL,共重复超声提取2次,超声功率300W,提取温度40℃,每次提取60min。合并提取液,旋蒸除去乙醇,经布氏漏斗抽滤后,上样至装填有AB-8大孔树脂的层析柱(直径为2.6cm、高度为60cm),吸附完成后,依次用300mL和300mL乙酸乙酯洗脱除去杂质,然后用1.5L酸性乙醇(60%)洗脱花青素,收集洗脱液,再次减压浓缩除去有机溶剂,真空冷冻干燥,得到桑葚花青素提取物。
(4)取桑叶蛋白1.5g溶解于50mL磷酸盐缓冲液(0.02mol/L)中,在80℃条件下水浴10min,磁力搅拌2h,加入37.5mg桑葚花青素,室温下磁力搅拌1h,再加入大豆油10mL和桑叶多糖0.3g,搅拌1h,然后12000r/min均质3min,得到乳液。
对比例1
步骤(2)不制备桑叶多糖,步骤(4)不添加桑叶多糖,其它步骤同实施例1。
对比例2
将步骤(4)桑叶蛋白替换为市售的大豆蛋白,其它步骤同实施例1。
对比例3
步骤(2)不制备桑叶多糖,步骤(4)不添加桑叶多糖,将步骤(4)桑叶蛋白替换为市售的大豆蛋白,其它步骤同实施例1。
性能测试
测定实施例1和对比例1-3乳液的稳定性指标和桑葚花青素热稳定性,具体步骤如下:
(1)ζ-电位测定:用磷酸缓冲液(10mmol/L,pH=7)将样品稀释100倍。采用Zeta电位仪对乳状液ζ-电位进行测定,测量温度为25℃,平衡时间为2min,每个样品测定3次,取平均值。
(2)乳化活性及乳化稳定性测定:用SDS溶液(0.1%)将乳液样品稀释100倍,用紫外分光光度计测量初始状态的吸光值和放置10min后的吸光值,在500nm处比色,按公式计算乳化活性指数(m2/g)和乳化稳定性指数(min)。
(3)花青素热稳定性:将添加0.05mol/L的有机酸的桑果汁乳液(桑葚原汁含量50%,乳液样品含量50%)分别置于80℃恒温水浴7h,每隔1h测定最大吸光度,绘制-ln(ct/c0)-时间曲线,计算花青素热降解半衰期t1/2。
测定结果如表1所示:
表1实施例1和对比例1-3乳液的稳定性指标和桑葚花青素热稳定性
项目 | 实施例1 | 对比例1 | 对比例2 | 对比例3 |
ζ-电位 | -36.67 | -31.10 | -34.00 | -30.33 |
乳化活性指数(m2/g) | 74.14 | 63.43 | 74.26 | 65.52 |
乳化稳定性指数(min) | 91.25 | 80.12 | 84.15 | 75.25 |
热降解半衰期t1/2(h) | 3.44 | 2.92 | 3.28 | 2.87 |
由上表可知,实施例1制备的乳液乳化稳定性和花青素热稳定性最好,乳化活性指数和对比例2相近。即本申请将桑叶蛋白、桑叶多糖和桑葚花青素制备乳液,有效提高了整个乳液体系的稳定性,同时有效提高了桑葚花青素热稳定性。
对所公开的实施例的上述说明,使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的,本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下,在其它实施例中实现。因此,本发明将不会被限制于本文所示的这些实施例,而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。
Claims (10)
1.一种桑叶蛋白-花青素复合乳液的制备方法,其特征在于,具体包括以下步骤:
(1)先将桑叶进行真空冷冻干燥,粉碎,过40目筛,得到桑叶粉;向桑叶粉中加入0.1mol/L的NaOH溶液,超声提取,第一次离心,收集上清液;调节上清液pH为4.8,待蛋白质产生絮状沉淀后,4℃静置,第二次离心,收集沉淀,上清液备用;用95%乙醇洗涤沉淀,用PBS复溶后在蒸馏水中透析1d,真空冷冻干燥,即得桑叶蛋白;
(2)收集步骤(1)中第二次离心的上清液,调节pH至中性,真空浓缩,加入无水乙醇,4℃静置,使沉淀析出,离心收集沉淀;用蒸馏水溶解沉淀,缓慢滴加到经处理的DEAE-52纤维素层析柱上,用NaCL溶液进行梯度洗脱,收集多糖含量最高的组分,装载到葡聚糖凝胶SephadexG-100柱上,用蒸馏水洗脱,根据峰值收集合并洗脱液,真空冷冻干燥,即得桑叶多糖;
(3)将新鲜桑葚用高速匀浆机打浆,加入酸化乙醇,超声提取,共重复提取2次,合并提取液;将提取液旋蒸除去乙醇,经布氏漏斗抽滤后,上样至装填有AB-8大孔树脂的层析柱,吸附完成后,用蒸馏水和乙酸乙酯洗脱除去杂质,然后用60%酸性乙醇洗脱花青素,收集洗脱液,再次减压浓缩除去有机溶剂,真空冷冻干燥,得到桑葚花青素提取物;
(4)取桑叶蛋白溶解于磷酸盐缓冲液中,热处理后磁力搅拌2h,随后调节pH至7.0,并加入桑葚花青素提取物,室温下磁力搅拌1h,再加入大豆油和桑叶多糖,搅拌1h,最后均质制备乳液。
2.根据权利要求1所述一种桑叶蛋白-花青素复合乳液的制备方法,其特征在于,所述步骤(1)中,桑叶与NaOH溶液料液比为g:mL=1:30-50;超声功率300W,提取温度40℃,提取时间20-60min。
3.根据权利要求2所述一种桑叶蛋白-花青素复合乳液的制备方法,其特征在于,所述步骤(1)中,桑叶与NaOH溶液料液比为g:mL=1:40;超声提取时间为45min。
4.根据权利要求1所述一种桑叶蛋白-花青素复合乳液的制备方法,其特征在于,所述步骤(2)中,真空浓缩的体积为初始体积的1/10-20。
5.根据权利要求4所述一种桑叶蛋白-花青素复合乳液的制备方法,其特征在于,所述步骤(2)中,梯度洗脱中NaCL溶液的梯度浓度为0mol/L、0.1mol/L、0.3mol/L、0.5mol/L;
所述多糖含量最高的组分为以0.3mol/L NaCL溶液洗脱的洗脱液。
6.根据权利要求1所述一种桑叶蛋白-花青素复合乳液的制备方法,其特征在于,所述步骤(3)中,酸化乙醇为含有0.1%柠檬酸的乙醇溶液;
桑葚浆与酸化乙醇料液比为g:mL=1:2-5;超声功率300W,提取温度40℃,提取时间20-60min。
7.根据权利要求6所述一种桑叶蛋白-花青素复合乳液的制备方法,其特征在于,所述步骤(3)中,桑葚浆与酸化乙醇料液比为g:mL=1:3;超声提取时间为30min。
8.根据权利要求7所述一种桑叶蛋白-花青素复合乳液的制备方法,其特征在于,所述步骤(3)中,大孔树脂洗脱所用的蒸馏水体积为层析柱柱体积的1倍,乙酸乙酯体积为层析柱柱体积的1倍,60%酸化乙醇体积为层析柱柱体积的5倍。
9.根据权利要求1所述一种桑叶蛋白-花青素复合乳液的制备方法,其特征在于,所述步骤(4)中,所述磷酸盐缓冲液的浓度为0.02 mol/L;桑叶蛋白的质量浓度为30mg/mL,桑叶蛋白溶液与大豆油的体积比为5:1,桑叶蛋白与花青素的质量比为40:1,桑叶蛋白与桑叶多糖的质量比为5:1;所述的热处理为在80℃条件下水浴10min,均质速度为12000r/min,时间为3min。
10.权利要求1所述一种桑叶蛋白-花青素复合乳液的制备方法制备的桑叶蛋白-花青素复合乳液。
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