CN102159093A - 在含有酚类化合物的组合物中降低收敛性 - Google Patents
在含有酚类化合物的组合物中降低收敛性 Download PDFInfo
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Abstract
本发明通常涉及口味的领域。特别涉及收敛性的降低。本发明的一个实施方案涉及至少一种磷脂用于制备含酚组合物以降低组合物的收敛性的用途。
Description
本发明通常涉及口味的领域。特别涉及收敛性的降低。本发明的一个实施方案涉及至少一种磷脂用于制备含酚类化合物的组合物以降低组合物的收敛性的用途。
出于本发明的目的,酚类化合物是含有至少一个与芳环结合的羟基的任意化合物。
作为本发明对象的酚类化合物可见于多种水果中,例如苹果、黑莓、越橘、葡萄、桃、梨、李、悬钩子和草莓。蔬菜例如甘蓝(cabbage)、芹菜、葱和欧芹也含有大量的酚类。酚类化合物还存在于咖啡、巧克力、茶和酒中。这类化合物包括单体的单环酚类化合物,例如没食子,和化合物例如黄烷醇、黄酮醇和花色素。还包括了含有不同倍数的上述单体分子的寡聚和多聚的化合物,和许多这类化合物的酰基化和/或糖基化的衍生物。
普遍已知的绿茶酚,儿茶素(catechin)是黄酮类化合物(黄烷-3-醇),其组成了新鲜茶叶的多达15%干重。未发酵的绿茶含有四种主要的儿茶素:表儿茶素(EC)、表儿茶素没食子酸酯(ECG,epicatechin gallate)、表没食子儿茶素(EGC)和表没食子儿茶素没食子酸酯(EGCG,epigallocatechin gallate)。表没食子儿茶素没食子酸酯(EGCG)是茶中最丰富的儿茶素。
因为它们的化学结构,植物酚能够消灭自由基和失活其它助氧化剂(pro-oxidant)。关于它们的抗氧化活性,许多健康好处已归因于天然酚类的膳食消耗(Shahidi,F.和Ho,C.T.(2005)ACS Symp.Ser.,909,1-8;Scalbert,A.等,(2005)Crit.Rev.Food Sci.Nutr.,45,287-306)。
多种流行病学的研究已解读了在茶消耗和人心血管疾病和癌症发生之间的关系。一些这类研究已经证实在红茶和绿茶的消费者中,显著的心血管疾病风险降低。此外,存在关于高剂量的绿茶对预防消化道癌症,特别是胃癌有好处的一些证据(Higdon,J.V.和Frei,B.(2003)Critical Reviewsin Food Science and Nutrition 43,89-143)。
酚类在中性至碱性pH下易于氧化,导致在存在氧气的条件下快速损失这类化合物。酚类在肠内主要的生理条件下减少的稳定性已被用于解释它们的低生物利用度(Manach,C.等,(2005)Review of97bioavailabilitystudies,Am.J.Clin.Nutr.,81,230S-242S)。
酚类是许多饮料和食品的收敛性的原因。收敛性描述为涩(puckering)、粗糙或干燥的口感,被认为是由酚类与碱性唾液的富含脯氨酸蛋白(PRP)相互作用引起的。普遍设想收敛性的分子起源是在酚结合后PRP的沉淀以及随后改变至口的粘膜层。虽然只有较高分子量的酚可以沉淀唾液蛋白,但黄烷-3-醇单体、黄烷-3-醇二体和三体,以及羟基苯甲酸表现出引发收敛性的感觉。这些较小的酚的收敛性可能源自与蛋白质形成不沉淀的复合物,或蛋白质与具有1,2-二羟基或1,2,3-三羟基的简单酚类的交联(Lesschaeve I.和Noble A.C.(2005)American Journal of ClinicalNutrition,81(增刊)330S-335S)。
收敛性的感觉对一些人是不愉快的,足以限制相关产品的消费者市场。例如,虽然绿茶可以提供明显的膳食好处,但许多人仍回避该饮料,因为它的收敛性。应对成分的收敛性的典型方法是增加整个食品的甜度。不幸的是,增加甜度只能部分的掩盖收敛性。此外,如果通过增加糖组分(例如蔗糖或类似的糖)来提高甜度,则卡路里的水平可不理想的增加。
因此,本发明的目标是提供在收敛的饮料和食品中降低收敛性,同时维持产品理想的感觉性质的方法。甚至更理想的获得比原始产品具有降低的收敛性和较少卡路里的食品。
本发明人惊讶的发现可以通过根据权利要求1的应用实现该目标。
因此,本发明的一个实施方案是至少一种磷脂用于制备含至少一种酚类化合物的组合物以降低组合物的收敛性的用途。
收敛性是科学领域明确定义的术语,是清楚的,因而必须与例如苦味区别开。
引用Isabelle Lesschaeve和Ann C Noble在Am J Clin Nutr 2005;81(增刊):330S-5S中发表的文章,其公开文本通过引用整合到本文中。收敛性感觉上描述为涩的、粗糙的或干燥的口感,而收敛剂则化学上定义为沉淀蛋白质的化合物。对于可溶于水的酚类,据报道需要在500至3000之间的分子量。与该定义一致的是,Adams和Harbertson(Am J Enol Vitic1999;50:247-52)开发了对单宁的测定。
收敛性通常在组合物与口接触时感觉到。因此,在一个实施方案中,本发明的组合物将与口接触。
这包括但不限于想要用于人或动物消费的产品。例如想要外部应用的化妆品制品或乳膏也可以直接或间接的与口接触。
优选的,含酚组合物选自食品、药物、营养食品、食品添加剂、饮料、宠物食品、口部化妆品和牙齿护理产品。
任何磷脂或磷脂的组合都可用于本发明的目的。特别是可以使用酸性或中性的。
在本发明的特别优选的实施方案中,磷脂是中性的,甚至更优选的选自中性磷脂,例如磷脂酰胆碱、磷脂酰乙醇胺及其溶解衍生物(lyso-derivatives)、鞘磷脂;酸性磷脂例如磷脂酰丝氨酸、磷脂酸、磷脂酰甘油、心磷脂、单酰甘油单磷酸(monoacylglycerol monophosphate)、单酰甘油二磷酸(monoacylglycerol diphosphate)、双磷脂酰-单磷脂酸(biphosphatidyl-monophosphatidic acid)、磷脂酰肌醇(phosphatidylinositol)、磷脂酰肌醇磷酸(phosphatidylinositol phosphates),或酸性溶血磷脂,例如溶血磷脂酰丝氨酸(lysophosphatidylserine)、溶血磷脂酸、溶血磷脂酰肌醇(lysophosphatidylinositol)、溶血磷脂酰甘油(lysophosphatidylglycerol)、双磷脂酰-溶血磷脂酸(bisphosphatidyl-lysophosphatidic acid);或其混合物。
在本发明的特别优选的实施方案中,只使用中性磷脂。其具有这样的优点,即这类磷脂允许甚至在复杂的食品系统中产生降低收敛性所需的结构,从而可用于广泛的产品。
导致收敛性的酚类化合物通常以植物、水果、动物产品和/或其提取物的形式存在。
优选的,酚类化合物以来自天然食物产品中的提取物的形式提供。
如上所述,酚类化合物可见于多种水果中,例如苹果、黑莓、越橘、葡萄、桃、梨、李、悬钩子和草莓;蔬菜例如甘蓝、芹菜、葱或欧芹。
此外,组合物可以包括柑橘类水果、浆果、葡萄、可可、核桃(walnut)、花生、石榴、巴拉圭茶、蔬菜、调料(seasoning)、调味料(flavoring material)、大豆;乳、水产品、坚果、发酵食品、可可、咖啡、巧克力;茶,特别是红茶、绿茶、发酵茶、半发酵茶、酒、啤酒、橄榄油、提取物或其部分。
根据本发明使用的典型酚类优选的选自羟基苯甲酸和类黄酮酚类,包括黄烷醇和黄酮醇,例如黄烷-3-醇单体,如儿茶素、表儿茶素、表没食子儿茶素、表儿茶素没食子酸酯和表没食子儿茶素没食子酸酯,及其寡聚物和多聚物,例如原花色素或缩合单宁。
任意量的磷脂可有效降低含酚化合物的产品的收敛性,特别是感觉到的收敛性。
磷脂的效率基本符合剂量响应曲线。
然而,在优选的实施方案中,组合物包括磷脂和酚类,其重量比例在1∶10至10∶1的范围,优选在1∶2至4∶1的范围。
在本发明的一个实施方案中,磷脂以在组合物的0.01-80重量份范围内的量用于含酚组合物中,优选以在组合物的0.05-5重量份范围内的量。
本发明人还发现,磷脂不但可以只用于降低含酚类化合物的组合物的收敛性,还可以可选的或额外的用于增加酚类的稳定性。
此外,可选的或额外的,它们可用于增加酚类化合物的生物利用度和/或改善含酚组合物的口味。
本领域技术人员可以理解,在不脱离所公开的本发明范围的条件下,他们可以自由的组合本文所述的本发明的所有特征。特别是所述用于本发明用途的特征可用于本发明的食品,反之亦然。
本发明的其他优点和特征根据下列实施例和附图是显而易见的。
图1显示卵磷脂对绿茶中的Egcg的结合。
实施例:
磷脂对儿茶素的口味和稳定性的影响
确定磷脂对绿茶儿茶素口味和稳定性的影响。此外,显示了磷脂和儿茶素之间的复合体的形成。
材料
绿茶提取物来自Choladi factory,India(批次52160450;2006年1月)。Soya卵磷脂(Phospholipon 80;批次60351;Phospholipid GmbH)是富含磷脂的产品,含约80%的磷脂酰胆碱。
绿茶样品的制备
通过在37℃搅拌混合物2h,将Soya卵磷脂分散在蒸馏水中,产生不同的浓度(0.05%;0.1%和0.2%)。在用Ultraturrax以全速预均质化样品前,将磷酸盐缓冲液添加到各个样品中,在pH 6.0产生20mM的终浓度。分散液用氮气冲洗(flush)5分钟,然后加入绿茶提取物至终浓度为0.2%。在温和搅拌15min后,用Microfluidizer处理器(Microfluidics,Newton,MA,USA)在250bar运行1次,来最终均质化混合物。遵循相同的流程制备绿茶对照,除了不添加任何卵磷脂。将均质化的分散体装入1lt玻璃瓶中,在蒸汽加热的水浴中灭菌(80℃30秒)。
绿茶样品的储存
灭菌的样品储存在室温下可达25天。通过储存测试,没有检测到任何嗜温微生物(mesophilic germ)或肠杆菌科(Enterobacteriaceae)的微生物污染。
儿茶素分析
在C-18柱上,通过UPLC分析新鲜的和储存的样品中的绿茶儿茶素,使用280nm的UV检测。为确定总儿茶素,用浓缩的醋酸处理样品,并用抗坏血酸、EDTA和乙腈稳定提取物。为确定游离的儿茶素,每个样品先使用Eppendorf(Dr Vaudaux AG,Binningen,CH)离心机5415在14,000x g旋转30min。然后如前所述处理所获得的上清液。计算(-)-表没食子儿茶素(Egc)、(-)-表没食子儿茶素-3-没食子酸酯(Egcg)和咖啡因的稳定性和与磷脂的结合。
感觉评估
评判小组
预先训练的进行收敛性评估的21名评判员(内部和外部的)参与感觉测试。
测试
根据0-10线性评分(0=无收敛性,10=强收敛性)为每种绿茶样品的收敛性强度打分。在过程开始,分别仅品尝绿茶(对照)示例最大收敛性(10分)。估计4种具有不同卵磷脂浓度(0-0.15%)的样品的各种的收敛性强度。样品以平衡的顺序单个存在。在每个样品之间遵守3分钟的停顿,品尝者可以漱口,以及通过咀嚼面包中和所述口味。
样品的情况介绍
样品在红光下置于1.5ml的深黑色Eppendorf管中,以掩饰由于分散的卵磷脂造成的外观差异。品尝者被指导将管的完整内容物放入口中,评估口味,然后吐掉。每种样品存在一式两份,使品尝者需要时能够重复任何品尝。
结果和讨论
游离和结合的绿茶儿茶素
分析含有递增浓度的卵磷脂(0.05;0.1;0.15%)的绿茶样品的游离和结合的儿茶素。没有没食子酸酯部分的绿茶儿茶素只表现出与卵磷脂非常微弱的结合。相反,发现具有没食子酸酯部分的绿茶儿茶素(Egcg和Ecg)与添加的卵磷脂相互作用,产生结合和游离的儿茶素级分。结合儿茶素没食子酸酯与游离的比例随添加到绿茶中的卵磷脂的量而增加(参见图1关于Egcg的结果)。
不希望被任何理论约束,本发明人目前假设Ecg和Egcg作为绿茶中“最亲脂”的儿茶素具有与磷脂(特别是卵磷脂)的一定亲和力,可以与其可逆的结合。
卵磷脂对绿茶收敛性的影响
通过感觉评估确定含卵磷脂的绿茶样品的收敛性(表1)。
关于四种样品的每一种的收敛性评分的统计学分析,以及卵磷脂浓度和对收敛性降低效果之间的关系,显示了收敛性随增加的卵磷脂浓度而明确的减少。然而,ANOVA(方差分析)显示,无法显著的区分不同的卵磷脂浓度(p=0.14)。
表1显示了以卵磷脂浓度的函数的所感觉到的绿茶中的收敛性的平均分数、标准偏差和置信区间。
已报道与其它的绿茶儿茶素相比,具有没食子酸酯部分的儿茶素(Egcg和Ecg)对收敛性具有更显著的影响(Hayashi,N.等,(2005)Biosc.Biotechnol.Biochem.,69,1306-1310)。目前报道的Egcg和Ecg与磷脂的结合应该限制了这类儿茶素与唾液蛋白质以及口中相应的受体的可能的相互作用。因而可以解释为何在含磷脂特别是卵磷脂的样品中发现降低的收敛性。
卵磷脂对绿茶稳定性的影响
分析用于收敛性品尝的同一绿茶样品在储存期间的稳定性。
基于这类绿茶儿茶素与磷脂的相互作用,也可以解释磷脂对儿茶素没食子酸酯抗氧化分解的保护作用(表2),特别是如果相互作用在保存期内持续。
表2:Egc和总Egcg在储存期间的稳定性
实际上,对含磷脂(例如卵磷脂)的绿茶样品在储存期间内的游离和结合儿茶素的分析揭示,结合Egcg的百分比不仅维持恒定,而且还随时间轻微增加(表3)。这一增加是由于游离形式的优先降解导致游离和结合Egcg之间的比例改变而导致的。
表3:Egcg和卵磷脂在储存期间的相互作用
卵磷脂对Egcg在绿茶样品的储存期间内的剂量依赖性稳定作用(表3)可以很好的支持这样的假说,即儿茶素通过与磷脂的相互作用受到保护。在其它的绿茶组分中,发现在选定的储存条件下,黄嘌呤生物碱咖啡因(xanthine alkaloide caffeine)是相当稳定的,不依赖与卵磷脂的任何相互作用。
考虑上述结果,可以得出这样的结论,即相同的机制对在储存期间保护这些儿茶素以及对在品尝此类绿茶制品的过程中感觉到的降低的收敛性负责,所述机制即没食子酸儿茶素与卵磷脂囊泡表面的结合。
Claims (13)
1.至少一种磷脂用于制备含至少一种酚类化合物的组合物以降低组合物的收敛性的用途。
2.权利要求1的用途,其中组合物将与口接触。
3.根据上述权利要求之一的用途,其中磷脂选自中性磷脂,例如磷脂酰胆碱、磷脂酰乙醇胺及其溶解衍生物、鞘磷脂;酸性磷脂例如磷脂酰丝氨酸、磷脂酸、磷脂酰甘油、心磷脂、单酰甘油单磷酸、单酰甘油二磷酸、双磷脂酰-单磷脂酸、磷脂酰肌醇、磷脂酰肌醇磷酸,或酸性溶血磷脂,例如溶血磷脂酰丝氨酸、溶血磷脂酸、溶血磷脂酰肌醇、溶血磷脂酰甘油、双磷脂酰-溶血磷脂酸;或其混合物。
4.根据上述权利要求之一的用途,其中组合物选自食品、药物、营养食品、食品添加剂、饮料、宠物食品、口部化妆品和牙齿护理产品。
5.根据上述权利要求之一的用途,其中组合物包括柑橘类水果、浆果、葡萄、可可、核桃、花生、石榴、巴拉圭茶、蔬菜、调料、调味料、大豆;乳、水产品、坚果、发酵食品、可可、咖啡、巧克力;茶,特别是红茶、绿茶、发酵茶、半发酵茶、酒、啤酒、橄榄油、提取物或其部分。
6.根据上述权利要求之一的用途,其中酚类化合物以来自天然食物产品的提取物的形式提供。
7.根据上述权利要求之一的用途,其中组合物包括磷脂和酚类,其重量比例在1∶10至10∶1的范围,优选在1∶2至4∶1的范围。
8.根据上述权利要求之一的用途,其中仅使用中性磷脂。
9.根据上述权利要求之一的用途,其中磷脂以在组合物的0.01-80重量份范围内的量用于含酚组合物中,优选以在组合物的0.05-5重量份范围内的量。
10.根据上述权利要求之一的用途,其中酚优选的选自羟基苯甲酸和类黄酮酚类,包括黄烷醇和黄酮醇,例如黄烷-3-醇单体,如儿茶素、表儿茶素、表没食子儿茶素、表儿茶素没食子酸酯和表没食子儿茶素没食子酸酯;及其寡聚物和多聚物,例如原花色素或缩合单宁。
11.根据上述权利要求之一的用途,以增加酚类的稳定性。
12.根据上述权利要求之一的用途,以改善酚类的生物利用度。
13.根据上述权利要求之一的用途,以改善含酚组合物的口味。
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