CN109566811A - 一种青钱柳脱苦工艺 - Google Patents
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Abstract
本发明公开了一种青钱柳脱苦工艺,包括下列步骤:(1)青钱柳洗净;(2)酸解;(3)酶处理;(4)微生物处理。青钱柳是我国独有的天然养生食物,但它本身具有一定的腥味,很多人对此比较排斥,影响了青钱柳的深加工利用。本发明提供的青钱柳脱苦工艺,通过感官评定,可以去除大部分苦的味道,并且不破坏青钱柳的整体形态,为青钱柳的深加工利用提供基础。
Description
技术领域
本发明涉及一种青钱柳脱苦工艺。
背景技术
青钱柳,(拉丁文名:Cyclocaryapaliurus.)别名:摇钱树、麻柳,青钱李、山麻柳、山化树。胡桃科、青钱柳属植物,我国南方多省均有发现,多以零星分布。青钱柳乃冰川四纪幸存下来的珍稀树种,仅存于中国。青钱柳被誉为植物界的大熊猫,医学界的第三棵树。人们知道,医学界的第一棵树——柳树,产生了阿司匹林,消炎杀菌、抗血栓,揭开了人类健康史的第一次变革。现代研究证实青钱柳叶具有降血糖、降血压、降血脂作用、增强机体免疫功能等作用。其主要活性成分是黄酮类和多糖类化合物。青钱柳中含有丰富的黄酮类物质,黄铜类化合物具有心血管系统活性、抗菌及抗病毒活性、抗肿瘤活性、抗氧化自由基活性、抗炎镇痛活性、保肝活性等多种生物活性。青钱柳叶含有大量的黄酮类化合物,具有降血糖、降血压、降血脂、增强肌体免疫力、抗氧化、防衰老等功能。
青钱柳目前的用途比较广,主要可以用来制茶,或其他保健功能性食品,但是它本身具有一定的苦味,限制了它的深加工利用。
发明内容
本发明要解决的技术问题是提供一种青钱柳脱苦的工艺,可以去除大部分苦的味道,并且不破坏青钱柳的整体形态。
本发明提供青钱柳脱苦工艺,包括下列步骤:
(1)青钱柳洗净,放入30-40℃的纯净水中浸泡3-5h。本步骤的主要作用是将青钱柳初步软化,利用下一步的酸化处理。
(2)酸化处理:在浸泡水中加入醋酸(或者苹果酸、柠檬酸),调节pH为3.5-5,浸泡2-3h。通过大量实验发现,先用可食用酸处理后的青钱柳,可以利于苦味成分的消除,优选用醋酸,价格低,处理效果好,也可以选用苹果酸、柠檬酸等。醋酸的加入量依照浸泡水的pH确定,最佳的pH为3.5-5。
(3)酶处理:在浸泡水加入可食胶,纯净水和可食胶胶的重量比为:100:3-10,然后加入β-甘露聚糖酶、纤维二糖酶充分混合,每克可食胶对应的酶量是β-甘露聚糖酶50-120U,纤维二糖酶30-150U;酶解温度为30-35℃,时间为2-3h。根据现有文献的报道,可以选择用酶处理来消除某些食品中的苦味,例如潘利华在《β-葡萄糖苷酶对胡柚汁脱苦效果的研究》一文中,介绍了可以用β-葡萄糖苷酶的脱苦效果。但是不同食品的差别太大,本发明通过大量研究得出,可以用β-甘露聚糖酶、纤维二糖酶的结合来初步处理,可以起到很好的脱苦效果。
(4)微生物处理:将步骤3中的浸泡液升温到50-65℃,维持1-3h,冷却至42-45℃,接种双歧杆菌发酵;发酵温度25-30℃,发酵15-40h。
发酵完成后,将溶液和青钱柳分离,青钱柳可以烘干保存,进行下一步的利用,本发明所获得的处理后的溶液,可以对其进行进一步的利用,例如可以提纯一部分活性成分等等。
步骤3中,可食胶选自卡拉胶、黄原胶、瓜尔豆胶、琼脂、明胶、海藻酸钠、刺槐豆胶、魔芋胶等中的一种或多种混合。进一步的,本发明优先选择的是瓜尔豆胶。
步骤(4)微生物处理中,接种的微生物双歧杆菌的接种量,优选的范围是1-5*104cfu/g(青钱柳)。
本发明利用先酶解、后微生物发酵瓜尔胶方式,去除青钱柳的苦腥味,并增加其他风味。瓜尔胶为大分子天然亲水胶体羟丙基瓜尔胶,属于天然半乳甘露聚糖,品质改良剂之一,一种天然的增稠剂。本发明通过研究发现,利用双歧杆菌来发酵结合酶解发酵后的瓜尔胶溶液,可以去除青钱柳的苦腥味。
本发明的有益效果是:
青钱柳是我国独有的天然养生食物,但它本身具有一定的腥味,很多人对此比较排斥,影响了青钱柳的深加工利用。本发明提供的青钱柳脱苦工艺,通过感官评定,可以去除大部分苦的味道,并且不破坏青钱柳的整体形态,为青钱柳的深加工利用提供基础。
具体实施方式
实施例1
本实施例提供一种本发明提供青钱柳脱苦工艺,包括下列步骤:
(1)青钱柳洗净,放入40℃的纯净水中浸泡3h。本步骤的主要作用是将青钱柳初步软化,利用下一步的酸化处理。
(2)酸化处理:在浸泡水中加入醋酸,调节pH为3.5,浸泡2h。
(3)酶处理:在浸泡水加入可食胶,纯净水和可食胶胶的重量比为:100:10,然后加入β-甘露聚糖酶、纤维二糖酶充分混合,每克可食胶对应的酶量是β-甘露聚糖酶120U,纤维二糖酶150U;酶解温度为35℃,时间为2h。
(4)微生物处理:将步骤3中的浸泡液升温到65℃,维持1h,冷却至45℃,接种双歧杆菌发酵;发酵温度30℃,发酵15h。
发酵完成后,将溶液和青钱柳分离,青钱柳可以烘干保存,进行下一步的利用,本发明所获得的处理后的溶液,可以对其进行进一步的利用,例如可以提纯一部分活性成分等等。
步骤3中,可食胶选自瓜尔豆胶。
步骤(4)微生物处理中,接种的微生物双歧杆菌的接种量是5*104cfu/g(青钱柳)。
实施例2
本实施例提供的本发明提供青钱柳脱苦工艺,包括下列步骤:
(1)青钱柳洗净,放入30℃的纯净水中浸泡5h。
(2)酸化处理:在浸泡水中加入醋酸,调节pH为5,浸泡3h。
(3)酶处理:在浸泡水加入可食胶,纯净水和可食胶胶的重量比为:100:3,然后加入β-甘露聚糖酶、纤维二糖酶充分混合,每克可食胶对应的酶量是β-甘露聚糖酶50,纤维二糖酶30;酶解温度为30℃,时间为2h。
(4)微生物处理:将步骤3中的浸泡液升温到50℃,维持3h,冷却至42℃,接种双歧杆菌发酵;发酵温度25℃,发酵40h。
步骤3中,可食胶选自卡拉胶。
步骤(4)微生物处理中,接种的微生物双歧杆菌的接种量,优选的范围是1*104cfu/g(青钱柳)。
实施例3
通过感官评定脱苦后的青钱柳的苦味感。分值越大,效果越好。具体评定标准见下表,得分总和取平均值。
评分时,组织20位有食品专业基础的感官评定员分别对实施例1-2脱苦后的青钱柳进行感官评价对比,具体得分如下:
评价项目 | 本发明实施例1 | 本发明实施例2 |
颜色 | 7 | 8 |
苦味 | 9 | 10 |
由上表中的感官评价得分可知,本发明脱苦后的青钱柳,颜色保持原有的绿色,去除大部分苦的味道,并且没有破坏青钱柳的整体形态。
Claims (2)
1.一种青钱柳脱苦工艺,其特征在于,包括下列步骤:
(1)青钱柳洗净,放入30-40℃的纯净水中浸泡3-5h;
(2)酸解:在浸泡水中加入醋酸(或者苹果酸、柠檬酸),调节pH为3.5-5,浸泡2-3h;
(3)酶处理:在浸泡水加入可食胶,纯净水和可食胶胶的重量比为:100:3-10,然后加入β-甘露聚糖酶、纤维二糖酶充分混合,每克可食胶对应的酶量是β-甘露聚糖酶50-120U,纤维二糖酶30-150U;酶解温度为30-35℃,时间为2-3h;
(4)微生物处理:将步骤3中的浸泡液升温到50-65℃,维持1-3h,冷却至42-45℃,接种双歧杆菌发酵;发酵温度25-30℃,发酵15-40h。
2.根据权利要求1所述的青钱柳脱苦工艺,其特征在于,步骤3中,可食胶选自卡拉胶、黄原胶、瓜尔豆胶、琼脂、明胶、海藻酸钠、刺槐豆胶、魔芋胶等中的一种或多种混合。
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