CN112029567A - 用于提高油茶籽油出油率的低温压榨工艺 - Google Patents
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Abstract
本发明公开用于提高油茶籽油出油率的低温压榨工艺,包括以下步骤:S1:静电场处理;S2:磁场酶解:将油茶籽剥壳至籽仁含壳率≤10%,粉碎至40~50目,并加入处理液,控制固液比为1g/mL,搅拌均匀后,用0.2mol/L柠檬酸溶液调节pH至4.0~5.0,于强度为800~3200Gs的磁场中,45~50℃酶解处理2~6h,得到酶解后混合物;所述处理液由以下质量百分数组分组成:磷脂酶A1 0.02~0.1%、酸性纤维素酶0.2~1%、菠萝蛋白酶0.1~0.5%、蔗糖脂肪酸酯0.1~0.2%、水补足余量;S3:低温压榨;S4:碱炼脱酸;S5:过滤、微滤、脱水。本发明利用磁场辅助酶解处理油茶籽仁,改变酶分子的构象,提高酶活力,使油茶籽仁的细胞壁、细胞膜结构被破坏,增强细胞膜通透性,促进油茶籽中油脂的溶出。
Description
技术领域
本发明属于油茶籽加工技术领域,具体涉及用于提高油茶籽油出油率的低温压榨工艺。
背景技术
低温压榨是指在65℃以下的温度条件下,不对物料进行高温加热或蒸炒的预处理,直接物理压榨出油的方式,能够有效保持油脂中的天然活性成分及营养物质,如脂溶性维生素、角鲨烯、甾醇、类胡萝卜素等,避免高温使蛋白质变性,冷榨茶油基本具备脱胶或脱酸后油的品质,无需特别精炼即可食用。低温压榨法的最大缺陷是残油率高,约12~20%,为常规热榨法的2~3倍,出油率低。
因此,如何提高低温压榨油的出油率已成为植物油提取技术领域的一个研究热点,如申请号为CN201410205341.2的专利,公开一种真空微波酶法预处理制备冷榨油茶籽油的工艺,通过微波和酶的双重作用,促进油茶籽中的油脂溶出,但该工艺处理最大温度达到95℃,冷榨温度为70~90℃,温度较高,无法最大程度保留油茶中的维生素E、角鲨烯等活性物质。
发明内容
针对现有技术的不足之处,本发明的目的在于提供用于提高油茶籽油出油率的低温压榨工艺。
本发明的技术方案概述如下:
用于提高油茶籽油出油率的低温压榨工艺,包括以下步骤:
S1:静电场处理:25℃室温下,将新鲜油茶果置于强度为25~30kV/cm高压静电场中处理20~60min,再堆沤7~8d,使油茶籽充分后熟,并脱除油茶果外壳;
S2:磁场酶解:将油茶籽剥壳至籽仁含壳率≤10%,粉碎至40~50目,并加入处理液,控制固液比为1g/mL,搅拌均匀后,用0.2mol/L柠檬酸溶液调节pH至4.0~5.0,于强度为800~3200Gs的磁场中,45~50℃酶解处理2~6h,得到酶解后混合物;
所述处理液由以下质量百分数组分组成:磷脂酶A1 0.02~0.1%、酸性纤维素酶0.2~1%、菠萝蛋白酶0.1~0.5%、蔗糖脂肪酸酯0.1~0.2%、水补足余量;
S3:低温压榨:50~55℃真空干燥S2酶解后混合物至含水量为6~10%,于压榨温度为20~60℃,压榨压力0.5~2MPa的条件下进行一次压榨,破碎一次压榨后的油茶籽仁饼,再于压榨温度为20~60℃,压榨压力3~5MPa的条件下进行二次压榨,合并两次压榨油;
S4:碱炼脱酸:将S3得到的毛油注入碱炼锅中,加热至35~45℃,加入毛油重量5~10%碱液,搅拌中和1~2h,静置过夜后,放出皂脚,得到脱酸油;
S5:对脱酸油分别进行过滤、微滤后,50~55℃真空干燥至含水量≤0.5%后,即得所述油茶籽油。
优选的是,所述堆沤高度为80~120cm。
优选的是,所述蔗糖脂肪酸酯的HLB值为8~15。
优选的是,所述碱液为质量分数为的2~3%NaOH溶液。
优选的是,所述微滤的操作过程采用的微滤膜过滤孔径为0.1~0.2μm。
本发明的有益效果:
1、本发明预先在静电场中处理油茶果,受到高压静电场的极化作用,使油茶的蛋白质、磷脂双分子层的构象能发生改变,显著提高油茶果内淀粉酶、过氧化物酶、脱氢酶等转化酶的活力,使油茶中的淀粉和可溶性糖充分转化为油脂,进而明显提高油茶含油量。
2、本发明利用磁场辅助酶解处理油茶籽仁,磁场能够改变酶分子的构象,进而提高酶活力,使油茶籽仁的细胞壁、细胞膜结构被破坏,同时,磁场作用下,使细胞膜电位发生改变,增强细胞膜通透性,促进油茶籽中油脂的溶出,并加速酶解反应,进而显著提高压榨出油率。
3、本发明首次采用磷脂酶A1酶解油茶籽仁,细胞膜的主要成分脂类(50%)和蛋白质(40%),其中脂类主要为磷脂,在磷脂酶A1的作用下,油茶籽仁的细胞膜结构被完全破坏,进而使油脂的充分溶出;同时,磷脂酶A1还具有脱胶作用。
4、本发明通过两次不同压力压榨油茶籽,降低油茶饼粕残油率。
附图说明
图1为本发明用于提高油茶籽油出油率的低温压榨工艺流程图。
具体实施方式
下面结合实施例对本发明做进一步的详细说明,以令本领域技术人员参照说明书文字能够据以实施。
实施例1
用于提高油茶籽油出油率的低温压榨工艺,包括以下步骤:
S1:静电场处理:25℃室温下,将新鲜油茶果置于强度为25kV/cm高压静电场中处理60min,再堆沤7d,堆沤高度为100cm,使油茶籽充分后熟,并脱除油茶果外壳;
S2:磁场酶解:将油茶籽剥壳至籽仁含壳率≤10%,粉碎至40目,并加入处理液,控制固液比为1g/mL,搅拌均匀后,用0.2mol/L柠檬酸溶液调节pH至4.5,于强度为1200Gs的磁场中,45℃酶解处理6h,得到酶解后混合物;
所述处理液由以下质量百分数组分组成:磷脂酶A1 0.02%、酸性纤维素酶0.2%、菠萝蛋白酶0.1%、HLB值为10蔗糖脂肪酸酯0.1%、水补足余量;
S3:低温压榨:55℃真空干燥S2酶解后混合物至含水量为6%,于压榨温度为20℃,压榨压力0.5MPa的条件下进行一次压榨,破碎一次压榨后的油茶籽仁饼,再于压榨温度为20℃,压榨压力3MPa的条件下进行二次压榨,合并两次压榨油;
S4:碱炼脱酸:将S3得到的毛油注入碱炼锅中,加热至35℃,加入毛油重量5%碱液,碱液为质量分数为的2%NaOH溶液,搅拌中和1~2h,静置过夜后,放出皂脚,得到脱酸油;
S5:对脱酸油进行过滤,并以过滤孔径为0.1μm的微滤膜微滤后,50℃真空干燥至含水量≤0.5%后,即得所述油茶籽油。
实施例2
用于提高油茶籽油出油率的低温压榨工艺,包括以下步骤:
S1:静电场处理:25℃室温下,将新鲜油茶果置于强度为30kV/cm高压静电场中处理60min,再堆沤8d,堆沤高度为100cm,使油茶籽充分后熟,并脱除油茶果外壳;
S2:磁场酶解:将油茶籽剥壳至籽仁含壳率≤10%,粉碎至50目,并加入处理液,控制固液比为1g/mL,搅拌均匀后,用0.2mol/L柠檬酸溶液调节pH至4.5,于强度为3200Gs的磁场中,50℃酶解处理2~6h,得到酶解后混合物;
所述处理液由以下质量百分数组分组成:磷脂酶A1 0.1%、酸性纤维素酶1%、菠萝蛋白酶0.5%、HLB值为10蔗糖脂肪酸酯0.1~0.2%、水补足余量;
S3:低温压榨:55℃真空干燥S2酶解后混合物至含水量为10%,于压榨温度为50℃,压榨压力2MPa的条件下进行一次压榨,破碎一次压榨后的油茶籽仁饼,再于压榨温度为50℃,压榨压力5MPa的条件下进行二次压榨,合并两次压榨油;
S4:碱炼脱酸:将S3得到的毛油注入碱炼锅中,加热至45℃,加入毛油重量10%碱液,碱液为质量分数为的3%NaOH溶液,搅拌中和2h,静置过夜后,放出皂脚,得到脱酸油;
S5:对脱酸油进行过滤,并以过滤孔径为0.1μm的微滤膜微滤后,50~55℃真空干燥至含水量≤0.5%后,即得所述油茶籽油。
对比例1:与实施例1相同,区别在于:S1中不经静电场处理,直接堆沤7d。
对比例2:与实施例1相同,区别在于:S2处理液中无磷脂酶A1。
对比例3:与实施例1相同,区别在于:S2中,无磁场辅助作用,直接进行酶解。
对比例4:与实施例1相同,区别在于:S1中不经静电场处理,直接堆沤7d;S2中,无磁场辅助作用,同时,处理液中无磷脂酶A1。
对实施例1~2和对比例1~4低温压榨出的油茶籽油进行性能测试,试验结果下表所示:
由上表可知,本发明显著降低饼粕残油率高,出油率高,同时,能提高油茶籽油中活性成分含量。
尽管本发明的实施方案已公开如上,但其并不仅仅限于说明书和实施方式中所列运用,它完全可以被适用于各种适合本发明的领域,对于熟悉本领域的人员而言,可容易地实现另外的修改,因此在不背离权利要求及等同范围所限定的一般概念下,本发明并不限于特定的细节。
Claims (5)
1.用于提高油茶籽油出油率的低温压榨工艺,其特征在于,包括以下步骤:
S1:静电场处理:25℃室温下,将新鲜油茶果置于强度为25~30kV/cm高压静电场中处理20~60min,再堆沤7~8d,使油茶籽充分后熟,并脱除油茶果外壳;
S2:磁场酶解:将油茶籽剥壳至籽仁含壳率≤10%,粉碎至40~50目,并加入处理液,控制固液比为1g/mL,搅拌均匀后,用0.2mol/L柠檬酸溶液调节pH至4.0~5.0,于强度为800~3200Gs的磁场中,45~50℃酶解处理2~6h,得到酶解后混合物;
所述处理液由以下质量百分数组分组成:磷脂酶A1 0.02~0.1%、酸性纤维素酶0.2~1%、菠萝蛋白酶0.1~0.5%、蔗糖脂肪酸酯0.1~0.2%、水补足余量;
S3:低温压榨:50~55℃真空干燥S2酶解后混合物至含水量为6~10%,于压榨温度为20~60℃,压榨压力0.5~2MPa的条件下进行一次压榨,破碎一次压榨后的油茶籽仁饼,再于压榨温度为20~60℃,压榨压力3~5MPa的条件下进行二次压榨,合并两次压榨油;
S4:碱炼脱酸:将S3得到的毛油注入碱炼锅中,加热至35~45℃,加入毛油重量5~10%碱液,搅拌中和1~2h,静置过夜后,放出皂脚,得到脱酸油;
S5:对脱酸油分别进行过滤、微滤后,50~55℃真空干燥至含水量≤0.5%后,即得所述油茶籽油。
2.根据权利要求1所述用于提高油茶籽油出油率的低温压榨工艺,其特征在于,所述堆沤高度为80~120cm。
3.根据权利要求1所述用于提高油茶籽油出油率的低温压榨工艺,其特征在于,所述蔗糖脂肪酸酯的HLB值为8~15。
4.根据权利要求1所述用于提高油茶籽油出油率的低温压榨工艺,其特征在于,所述碱液为质量分数为的2~3%NaOH溶液。
5.根据权利要求1所述用于提高油茶籽油出油率的低温压榨工艺,其特征在于,所述微滤的操作过程采用的微滤膜过滤孔径为0.1~0.2μm。
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