CN107897774A - 一种营养梨干的制备方法 - Google Patents
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Abstract
本发明属于富硒晚秋黄梨的加工技术领域,具体涉及一种营养梨干的制备方法,包括新鲜晚秋黄梨切片处理、热风及真空冷冻干燥、混合溶液喷涂、远红外烘箱处理。本发明相比现有技术具有以下优点:本发明中量新鲜切片的梨片用菠萝提取物溶液浸泡,可以有效防止梨片氧化,同时能有效保持梨片中的营养不流失;然后利用风干和真空冷冻干燥结合的方式对梨片进行干燥,使梨干由快速干燥到慢速干燥,最后在梨片两面喷涂混合溶液,使梨片表面形成一层薄膜,配合远红外处理,所得梨干表皮硬化,耐咀嚼程度上升,咀嚼后回复性好,提高梨干口感,进一步减少了梨干内营养物质的流失,其中有机硒含量保持率达到96%以上。
Description
技术领域
本发明属于富硒晚秋黄梨的加工技术领域,具体涉及一种营养梨干的制备方法。
背景技术
硒是一种人类必须的稀有元素,具有抗癌、防癌、排除毒素、抗氧化、清除胆固醇、增强人体免疫力的功能,近年来,微量元素硒的作用在国内外引起普遍关注,据我国“硒与健康”数据库与营养研究表明,硒是人体健康和动物体内必须的14种微量元素之一,且兼具营养、抗毒性和解毒三重生物学功能,被称为生命的保护剂,而人体自身不能合成硒,食物中的硒才是硒的主要来源,现有技术通过种植管理方法,成功培育了富硒梨等多种水果,营养与口味兼具,深受消费者喜欢;为了方便储存和食用,现在已有将富硒梨制成梨干的产品,在当地以晚秋黄梨为主,因此对富硒晚秋黄梨制备梨干的方法进行研究,现有技术在制备梨干过程中可能会影响其营养组分,同时不同的制备方法得到的梨干营养和口感均会受到影响,现有梨干的制备中,通常为简单的干燥,部分营养容易流失,梨干硬度大没有弹性,口感较差。
发明内容
本发明的目的是针对现有梨干营养流失、口感较差的问题,提供了一种营养梨干的制备方法。
本发明是通过以下技术方案实现的:一种营养梨干的制备方法,包括以下步骤:
(1)挑选新鲜采集的晚秋黄梨,洗净、晾干,去果核、切片后浸入质量浓度为1.2-2.8%的菠萝提取物溶液中备用,所述切片厚度为4-5mm;
(2)将备用的梨片在50-60℃的条件下风干4-6小时,然后转入真空冷冻干燥机内进行干燥,冷冻干燥的条件是:真空度为5-7Pa,一次干燥的温度为-12℃,冷阱温度为-36℃,干燥时间为6-8小时;
(3)取卡拉胶加入相当于其重量40-50倍质量、温度为90-94℃的水中搅拌至卡拉胶完全溶解,然后加入相当于其重量2.6-5.4%的海藻酸钠、1.2-2.8%的蔗糖,混合完成后得到混合溶液,注入喷雾干燥机中,在梨干表面喷涂,喷涂量为3-5g/㎡;
(4)将上述干燥后的梨片送入远红外烘箱,在温度为75-85℃的条件下处理3-8分钟即得。
作为对上述方案的进一步改进,所述步骤(1)中洗净过程为用盐水清洗。
作为对上述方案的进一步改进,所述菠萝提取物溶液浸泡梨片的温度为8-14℃。
作为对上述方案的进一步改进,所述菠萝提取物由西安宾果生物化工科技有限公司提供。
作为对上述方案的进一步改进,所述喷涂混合溶液时,先对梨干的一面喷涂,完成后在远红外烘箱中处理6-8分钟,然后对另一面进行喷涂,完成后在远红外烘箱中处理3-5分钟。
本发明相比现有技术具有以下优点:本发明中量新鲜切片的梨片用菠萝提取物溶液浸泡,可以有效防止梨片氧化,同时能有效保持梨片中的营养不流失;然后利用风干和真空冷冻干燥结合的方式对梨片进行干燥,使梨干由快速干燥到慢速干燥,有效减少细胞结构的破坏,使梨片内部结构保持紧密完整,最后在梨片两面喷涂混合溶液,使梨片表面形成一层薄膜,配合远红外处理,避免由真空冷冻干燥引起的疏松多孔,所得梨干表皮硬化,耐咀嚼程度上升,咀嚼后回复性好,提高梨干口感,同时由于薄膜的保护,进一步减少了梨干内营养物质的流失,其中有机硒含量保持率达到96%以上。
具体实施方式
实施例1
一种营养梨干的制备方法,包括以下步骤:
(1)挑选新鲜采集的晚秋黄梨,洗净、晾干,去果核、切片后浸入质量浓度为2%的菠萝提取物溶液中备用,菠萝提取物溶液浸泡梨片的温度为12℃,所述切片厚度为4.5mm;
(2)将备用的梨片在55℃的条件下风干5小时,然后转入真空冷冻干燥机内进行干燥,冷冻干燥的条件是:真空度为6Pa,一次干燥的温度为-12℃,冷阱温度为-36℃,干燥时间为7小时;
(3)取卡拉胶加入相当于其重量45倍质量、温度为92℃的水中搅拌至卡拉胶完全溶解,然后加入相当于其重量4.2%的海藻酸钠、2%的蔗糖,混合完成后得到混合溶液,注入喷雾干燥机中,在梨干表面喷涂,喷涂量为4g/㎡;
(4)将上述干燥后的梨片送入远红外烘箱,烘箱温度为80℃,喷涂混合溶液时,先对梨干的一面喷涂,完成后在远红外烘箱中处理7分钟,然后对另一面进行喷涂,完成后在远红外烘箱中处理4分钟,即得。
其中,所述步骤(1)中洗净过程为用盐水清洗;所述菠萝提取物由西安宾果生物化工科技有限公司提供。
实施例2
一种营养梨干的制备方法,包括以下步骤:
(1)挑选新鲜采集的晚秋黄梨,洗净、晾干,去果核、切片后浸入质量浓度为1.2%的菠萝提取物溶液中备用,菠萝提取物溶液浸泡梨片的温度为14℃,所述切片厚度为4mm;
(2)将备用的梨片在50℃的条件下风干6小时,然后转入真空冷冻干燥机内进行干燥,冷冻干燥的条件是:真空度为15Pa,一次干燥的温度为-12℃,冷阱温度为-36℃,干燥时间为8小时;
(3)取卡拉胶加入相当于其重量40倍质量、温度为94℃的水中搅拌至卡拉胶完全溶解,然后加入相当于其重量2.6%的海藻酸钠、2.8%的蔗糖,混合完成后得到混合溶液,注入喷雾干燥机中,在梨干表面喷涂,喷涂量为3g/㎡;
(4)将上述干燥后的梨片送入远红外烘箱,烘箱温度为75℃,喷涂混合溶液时,先对梨干的一面喷涂,完成后在远红外烘箱中处理8分钟,然后对另一面进行喷涂,完成后在远红外烘箱中处理3分钟,即得。
实施例3
一种营养梨干的制备方法,包括以下步骤:
(1)挑选新鲜采集的晚秋黄梨,洗净、晾干,去果核、切片后浸入质量浓度为2.8%的菠萝提取物溶液中备用,菠萝提取物溶液浸泡梨片的温度为8℃,所述切片厚度为5mm;
(2)将备用的梨片在60℃的条件下风干4小时,然后转入真空冷冻干燥机内进行干燥,冷冻干燥的条件是:真空度为22Pa,一次干燥的温度为-12℃,冷阱温度为-36℃,干燥时间为6小时;
(3)取卡拉胶加入相当于其重量50倍质量、温度为90℃的水中搅拌至卡拉胶完全溶解,然后加入相当于其重量5.4%的海藻酸钠、1.2%的蔗糖,混合完成后得到混合溶液,注入喷雾干燥机中,在梨干表面喷涂,喷涂量为5g/㎡;
(4)将上述干燥后的梨片送入远红外烘箱,烘箱温度为85℃,喷涂混合溶液时,先对梨干的一面喷涂,完成后在远红外烘箱中处理6分钟,然后对另一面进行喷涂,完成后在远红外烘箱中处理5分钟,即得。
设置对照组1,将实施例1中菠萝提取物溶液替换为质量浓度为2%的盐水,其余内容不变;设置对照组2,将实施例1中梨片经热风干燥后在冷冻干燥至梨片含水量低于6%得到;设置对照组3,将实施例1中步骤(3)去掉,其余内容不变;
设计实验1,对以上各组梨干的有机硒含量进行检测,有机硒含量的检测方式参见文献《植物中有机硒含量的测定》,秦昉,中测定有机硒含量的方式,在制备梨干前对鲜梨中有机硒含量进行检测,制备梨干后,对相同重量原料检测,并计算硒的保持率,得到以下结果:
表1
组别 | 实施例1 | 实施例2 | 实施例3 | 对照组1 | 对照组2 | 对照组3 |
硒含量(μg/kg) | 65.3 | 64.8 | 64.7 | 65.2 | 64.9 | 65.4 |
保持率(%) | 97.4 | 96.8 | 97.6 | 88.3 | 84.7 | 89.2 |
通过表1中数据可以看出,本发明中方法可以尽可能的减少有机硒的流失,直接按照常规方法风干后会流失较多的硒,混合溶液对硒的保持有促进作用。
设计实验2,对以上各组咀嚼性、内聚性和回复性进行检测,其中咀嚼性为硬度、内聚性和弹性三者的乘积,具体结果如下:
表2
组别 | 咀嚼性(mJ) | 内聚性 | 回复性 |
实施例1 | 6.75 | 0.55 | 0.117 |
实施例2 | 6.71 | 0.53 | 0.114 |
实施例3 | 6.72 | 0.54 | 0.116 |
对照组1 | 6.54 | 0.47 | 0.102 |
对照组2 | 6.62 | 0.46 | 0.094 |
对照组3 | 6.67 | 0.49 | 0.103 |
通过表2中数据可以看出,本发明中方法处理后的梨干具有较好的咀嚼性和回复性,能够提高梨干的咀嚼口感。
Claims (5)
1.一种营养梨干的制备方法,其特征在于,包括以下步骤:
(1)挑选新鲜采集的晚秋黄梨,洗净、晾干,去果核、切片后浸入质量浓度为1.2-2.8%的菠萝提取物溶液中备用,所述切片厚度为4-5mm;
(2)将备用的梨片在50-60℃的条件下风干4-6小时,然后转入真空冷冻干燥机内进行干燥,冷冻干燥的条件是:真空度为5-7Pa,一次干燥的温度为-12℃,冷阱温度为-36℃,干燥时间为6-8小时;
(3)取卡拉胶加入相当于其重量40-50倍质量、温度为90-94℃的水中搅拌至卡拉胶完全溶解,然后加入相当于其重量2.6-5.4%的海藻酸钠、1.2-2.8%的蔗糖,混合完成后得到混合溶液,注入喷雾干燥机中,在梨干表面喷涂,喷涂量为3-5g/㎡;
(4)将上述干燥后的梨片送入远红外烘箱,在温度为75-85℃的条件下处理3-8分钟即得。
2.如权利要求1所述一种营养梨干的制备方法,其特征在于,所述步骤(1)中洗净过程为用盐水清洗。
3.如权利要求1所述一种营养梨干的制备方法,其特征在于,所述菠萝提取物溶液浸泡梨片的温度为8-14℃。
4.如权利要求1所述一种营养梨干的制备方法,其特征在于,所述菠萝提取物由西安宾果生物化工科技有限公司提供。
5.如权利要求1所述一种营养梨干的制备方法,其特征在于,所述喷涂混合溶液时,先对梨干的一面喷涂,完成后在远红外烘箱中处理6-8分钟,然后对另一面进行喷涂,完成后在远红外烘箱中处理3-5分钟。
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