CN105601956B - 一种Iota-卡拉胶凝胶及其制备方法 - Google Patents
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Abstract
本发明属于亲水胶体凝胶的技术领域,涉及一种卡拉胶凝胶,尤其是一种低浓度Iota‑卡拉胶凝胶及其制备方法。本发明提供了一种新型Iota‑卡拉胶凝胶,具体组成为:Iota‑卡拉胶0.6~1.0份、谷氨酰胺0.1~0.3份、水100份;所述份数为质量份数。本发明提供的制备方法包括:常温溶胀、加热溶胀和冷却凝胶。本发明可使0.6~1.0%低浓度Iota‑卡拉胶形成凝胶,所得凝胶透明度高,弹性好,凝胶强度强,常温下存放稳定性好,该方法步骤简单,操作方便,省时省力。
Description
技术领域
本发明属于亲水胶体凝胶的技术领域,涉及一种卡拉胶凝胶,尤其是一种低浓度Iota-卡拉胶凝胶及其制备方法。
背景技术
在食品工业中卡拉胶作为胶凝剂可用在软糖、果冻、火腿肠、仿生食品、果酱等食品中,商业化主要应用Kappa-型、Iota-型和Lambda-型3种卡拉胶。Kappa-型和Iota-型卡拉胶能形成热可逆凝胶,Lambda-型不能形成凝胶。由于Iota-卡拉胶的诸多物理化学特性与Kappa-卡拉胶和其它胶体有明显不同,使得其在食品等行业中有着广泛的应用价值和潜力。Iota-卡拉胶的基本骨架是由1,3-α-D-吡喃半乳糖和1,4-β-D-吡喃半乳糖组成,在D-半乳糖的C(4)和3,6-脱水L-半乳糖的C(2)各含有一个硫酸基团,其在水溶液中呈无规线团,浓度达到一定时可以形成的柔软凝胶,凝胶强度差,凝胶温度低,且形成凝胶的浓度较高。目前,Iota-卡拉胶主要作为Kappa-卡拉胶凝胶的调配物,以调节Kappa-卡拉胶凝胶的硬度,而以Iota-卡拉胶为主体的凝胶还很少。迄今为止促进低浓度Iota-卡拉胶凝胶的方法主要有两大类:一是凝胶多糖与Iota-卡拉胶复配凝胶;二是金属盐离子诱导Iota-卡拉胶凝胶。
专利号ZL200610138780.1公布了“一种养殖蚂蚁用的凝胶及其制备方法”,该专利以1~2份Kappa-卡拉胶、0.5~1.0份Iota-卡拉胶、10~16份糖、0.015~0.02份防腐剂、100份饮用水制备成凝胶,该专利解决了低浓度Iota-卡拉胶不能凝胶问题,但是凝胶中含有Kappa-卡拉胶,提高了凝胶中卡拉胶的含量,且含有大量的糖,成本较高。
《Int.J.Biol.Macromol》1984年第6卷发表了Peter S.Belton等的文章“Effectsof group I cation on the gelation of Iota carrageenan”研究了一价金属离子盐促使Iota-卡拉胶在较低浓度下形成凝胶的效果,结果表明0.1M的KCl、RbCl、CsCl、NaCl、LiCl可使0.5%Iota-卡拉胶形成凝胶,其凝胶储能模量(G’)明显增大,凝胶强度增强。但所制备凝胶硬脆,且过多的盐离子摄入不利于人体健康。
发明内容
本发明目的在于开发一种Iota-卡拉胶凝胶及制备方法,使Iota-卡拉胶在低浓度下可以形成强度好、柔软富有弹性且不泌水的凝胶,同时,制备方法简单,操作方便。
为达到上述目的,本发明提供了一种Iota-卡拉胶凝胶的制备方法,具体步骤如下:
S1、常温溶胀:将0.6~1.0份Iota-卡拉胶加入100份水中,1000~1300rpm的速率搅拌5~10min,室温静置12~24h,得Iota-卡拉胶溶胀液;
S2、加热溶胀:向步骤S1得到的Iota-卡拉胶溶胀液中加入0.1~0.3份谷氨酰胺;以10~15℃/min的速率升温至92~97℃,保持30~70min,同时,以1000~1300rpm的速率搅拌,形成凝胶液;
S3、冷却凝胶:当步骤S2得到的凝胶液冷却至室温后,置于0~4℃下,静置4~6h,即得Iota-卡拉胶凝胶;
上述份数均为质量份数。
优选方式下,步骤S2中谷氨酰胺的加入量与步骤S1中Iota-卡拉胶的加入量的质量比为1:5~10。
本发明还提供了上述方法制得的Iota-卡拉胶凝胶,具体组成为:Iota-卡拉胶0.6~1.0份、谷氨酰胺0.1~0.3份、水100份;所述份数为质量份数。
本发明的优点和积极效果为:
1、本发明的Iota-卡拉胶凝胶是以Iota-卡拉胶和促凝胶剂谷氨酰胺为主要原料,通过溶胀、冷却制成凝胶,Iota-卡拉胶在0.6~1.0%的低浓度下可形成凝胶。
2、本发明中加入的谷氨酰胺可以作为促凝胶剂,同时还可作为营养增补剂。
3、本发明新型Iota-卡拉胶凝胶柔软、透明度高,弹性良好,凝胶强度高,常温下贮存稳定性好。
4、本发明方法步骤简单,操作方便,省时省力。
本发明在对Iota-卡拉胶和氨基酸相互作用进行研究的基础上提出了一种新型Iota-卡拉胶凝胶的制备技术。
附图说明
图1为本发明一种Iota型卡拉胶在谷氨酰胺不同添加量时凝胶的tan(δ)随频率变化图。
具体实施方式
本发明目的在于开发一种Iota-卡拉胶凝胶,利用谷氨酰胺作为凝胶促凝剂,使Iota-卡拉胶在低浓度下形成强度好、柔软富有弹性且不泌水的凝胶,提供一种使低浓度Iota-卡拉胶凝胶的制备方法,该方法步骤简单,操作方便。
为了充分公开本发明的Iota-卡拉胶凝胶及其制备方法,下面结合实施例加以说明。
实施例1
一种Iota-卡拉胶凝胶,其组成成分及重量如下:
Iota-卡拉胶1.0g,谷氨酰胺0.2g,水100g。
如上所述的Iota-卡拉胶凝胶的制备方法,制备步骤如下:
S1、常温溶胀:将Iota-卡拉胶1.0g加入到100g水中,搅拌器搅拌10min,搅拌速率为1200rpm,室温下放置16h,得Iota-卡拉胶溶胀液;
S2、加热溶胀:将0.2g谷氨酰胺加入步骤S1所得的Iota-卡拉胶溶胀液,一边加热一边搅拌,升温速率为10℃/min,加热至95℃,搅拌速率为1300rpm,恒温搅拌70min形成凝胶液;
S3、冷却凝胶:将步骤S2所得的凝胶液冷却至室温,置于4℃下放置6h,即得Iota-卡拉胶凝胶。
实施例2
一种Iota-卡拉胶凝胶,其组成成分及重量如下:
Iota-卡拉胶0.7g,谷氨酰胺0.3g,水100g。
如上所述的Iota-卡拉胶凝胶的制备方法,制备步骤如下:
S1、常温溶胀:将0.7gIota-卡拉胶加入100g水中,搅拌器搅拌8min,搅拌速率为1000rpm,室温下放置12h,得Iota-卡拉胶溶胀液;
S2、加热溶胀:将0.3g的谷氨酰胺加入步骤S1所得的Iota-卡拉胶溶胀液,一边加热一边搅拌,升温速率为12℃/min,加热至92℃,搅拌速率为1200rpm,恒温搅拌50min形成凝胶液;
S3、冷却凝胶:将步骤S2所得的凝胶液冷却至室温,置于4℃下放置4h,即得Iota-卡拉胶凝胶。
运用此方法制得的Iota-卡拉胶凝胶透明度高,弹性良好,凝胶强度强,凝胶温度高于常温,常温下存放稳定性良好。
凝胶的tan(δ)数值可以反映凝胶的粘弹性。本发明一种Iota-卡拉胶凝胶的tan(δ)随频率变化的检测结果见图1,从图1可以看出随着谷氨酰胺添加量的的增加,凝胶的tan(δ)越小,形成凝胶的趋势越好,凝胶强度越高。
本发明将谷氨酰胺加入Iota-卡拉胶凝胶可显著提高其凝胶强度。
以上所述,仅为本发明较佳的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明披露的技术范围内,根据本发明的技术方案及其发明构思加以等同替换或改变,都应涵盖在本发明的保护范围之内。
Claims (2)
1.一种Iota-卡拉胶凝胶的制备方法,具体步骤如下:
S1、常温溶胀:将0.6~1.0份Iota-卡拉胶加入100份水中,1000~1300rpm的速率搅拌5~10min,室温静置12~24h,得Iota-卡拉胶溶胀液;
S2、加热溶胀:向步骤S1得到的Iota-卡拉胶溶胀液中加入0.1~0.3份谷氨酰胺;以10~15℃/min的速率升温至92~97℃,保持30~70min,同时,以1000~1300rpm的速率搅拌,形成凝胶液;
所述谷氨酰胺的加入量与步骤S1中Iota-卡拉胶的加入量的质量比为1:5~10;
S3、冷却凝胶:当步骤S2得到的凝胶液冷却至室温后,置于0~4℃下,静置4~6h,即得Iota-卡拉胶凝胶;
上述份数均为质量份数。
2.一种权利要求1所述方法制备的Iota-卡拉胶凝胶,其特征在于,具体组成为:Iota-卡拉胶0.6~1.0份、谷氨酰胺0.1~0.3份、水100份;所述份数为质量份数。
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