CN108402170A - 一种微波真空干燥罗汉果的方法 - Google Patents
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Abstract
本发明以提供一种微波真空干燥罗汉果的方法,干燥后的罗汉果果实形态自然,果皮、果肉连在一起,组织无皱缩、多孔疏松;表面呈黄绿色或金黄色,色泽均匀;泡水成黄色;冲泡口感保留罗汉果清香味、甜味。工艺流程:鲜罗汉果→后熟→清洗→漂烫→打孔→微波真空干燥。将清洗后的鲜果置于90‑95℃的漂烫液中漂烫1‑5min;漂烫液中加入质量分数为0.1‑0.5%的生姜,0.05%的异VC钠,并用柠檬酸调节溶液pH至4.0‑5.0;在漂烫后的罗汉果顶部果蒂和底部果脐处打孔,微波真空干燥的工艺参数控制如下:真空度为80‑95KPa,温度50‑60℃,微波动态干燥机内干燥3‑5小时,罗汉果含水量低于14%。
Description
技术领域
本发明涉及生物化工技领域,尤其是一种罗汉果干燥的方法。
背景技术
罗汉果营养价值很高,含罗汉果甜苷、葡萄糖、果糖、多糖、蛋白质、氨基酸、黄酮类、维生素C、酶、和多种矿质元素,具有味甘性凉,归肺、大肠经,有润肺止咳,生津止渴的功效,适用于肺热或肺燥咳嗽,百日咳及暑热伤津口渴等,此外还有润肠通便的功效。由于罗汉果鲜果保鲜时间短,罗汉果深加工主要是将罗汉果烘干保存。常见的干燥方法有直接烘干法、真空干燥法,冷冻干燥法、微波干燥法。由于烘干法温度高,时间长,干燥后果实焦黑,果皮硬壳板结、果肉有明显收缩现象,褐色不均匀;多糖、维生素C等营养成分保留率低;泡水成褐色有明显焦糊气味,香气不好,冲泡口感不好。
发明内容
本发明所要解决的技术问题是提供一种微波真空干燥罗汉果的方法,干燥后的罗汉果果实形态自然,果皮、果肉连在一起,组织无皱缩、多孔疏松;表面呈黄绿色或金黄色,色泽均匀;泡水成黄色;冲泡口感保留罗汉果清香味、甜味。
为了解决该技术问题,本发明采用如下工艺流程:
鲜罗汉果→后熟→清洗→漂烫→打孔→微波真空干燥
(1) 后熟:将新鲜罗汉果摊放后熟8-10天,使部分水分挥发,皂苷类物质积累,促进罗汉果成熟;
(2) 清洗:用水将罗汉果表面的泥沙杂质洗净;
(3)漂烫:将清洗后的鲜果置于90-95℃的漂烫液中漂烫1-5min;漂烫液中加入质量分数为0.1-0.5%的茶多酚,0.05%的异VC钠,并用柠檬酸调节溶液pH至4.0-5.0;
这种漂烫能抑制新鲜罗汉果中的酶、杀灭微生物,保护罗汉果干燥后的颜色和口感,增强果皮韧性,保持果型;
(4)打孔:将漂烫后的罗汉果打孔;可以打1个孔,也可以打多个孔;孔径为1.5-2.5mm,深度约2.0-3.0cm;也可以直接把孔打穿;罗汉果打孔为果实内水分挥发提供通道,加快干燥速度,同时避免罗汉果炸果现象;
(5)微波真空干燥:将打孔后的罗汉果放入动态微波真空干燥设备内,按照操作规程操作,控制干燥的工艺参数控制如下:真空度为80-95KPa,温度45-70℃,微波动态干燥机内干燥3-5小时。当罗汉果的含水量低于14%时停止干燥操作,出料,进行放置冷却,真空包装,防止干罗汉果吸潮。
干燥后的罗汉果果实形态自然,果皮、果肉连在一起,组织无皱缩、多孔疏松;表面呈黄绿色或金黄色,色泽均匀;泡水成黄色;冲泡口感保留罗汉果清香味、甜味。
本发明具有下列优点和特性:
1、组合技术新颖。干燥后罗汉果的感官评价高,口感独特。将新鲜罗汉果摊放后熟8-10天,使部分水分挥发,促进罗汉果成熟;将罗汉果鲜果打孔,为微波真空干燥时水蒸汽排除提供通道,加快干燥速度,避免罗汉果炸果现象;将清洗后的鲜果使用漂烫液漂烫杀酶,增强果皮韧性,保持果型,为后面形成独特的冲泡风味打下基础;微波真空干燥,尤其是控制真空度为80-95KPa,温度50-60℃,干燥时间3-5小时,真空包装。这些技术组合在一起,才能形成干燥后的罗汉果果实形态自然,果皮、果肉连在一起,组织无皱缩、多孔疏松;表面呈黄绿色或金黄色,色泽均匀;泡水成黄色;冲泡口感独特,保留罗汉果清香味、甜味;保质期长。
2、干燥时间短,多糖、维生素C等营养成分保留率高。由于采用漂烫处理,微波加热,抽真空干燥,合理控制工艺参数,使得罗汉果干燥时间为3-5h,大大缩短干燥时间,同时多糖、维生素C等营养成分保留率分别提高5-10%,10-30%。这些技术组合在一起,互相支持,共同作用,才能得到高质量的干罗汉果。
具体实施方式
以下所述实例详细地说明了本发明。
实施例1
本发明采用如下工艺流程:
鲜罗汉果→后熟→清洗→漂烫→打孔→微波真空干燥
(1)后熟:将新鲜罗汉果摊放后熟10天,使部分水分挥发,皂苷类物质积累,促进罗汉果成熟;
(2)清洗:用饮用水将罗汉果表面的泥沙杂质洗净;
(3)漂烫:先配制漂烫液,往饮用水中加入质量分数为0.5%的茶多酚,0.05%的异VC钠,并用柠檬酸调节溶液pH至4.0;加热到95℃,将清洗后的鲜果置于95℃的漂烫液中漂烫1min;
这种漂烫能杀灭鲜罗汉果中酶和细菌,保护罗汉果干燥后的颜色,增强果皮韧性,保持果型,为干燥后的罗汉果独特口味形成打下基础;
(4)打孔:在罗汉果鲜果顶部果蒂和底部果脐处打孔,将罗汉果打穿,孔径为2.0mm,为罗汉果果实内水分挥发提供通道,加快干燥速度,同时避免炸果现象;
(5)微波真空干燥:
采用上海镧泰微波设备制造有限公司的VP-036A微波动态真空干燥机进行干燥。将打孔后的罗汉果鲜果1800个放入动态微波真空干燥设备的塑料筐内,按照操作规程操作,控制干燥的工艺参数控制如下:真空度为89KPa,温度68℃,微波动态干燥机内干燥3小时。出料,进行放置冷却,真空包装,防止干罗汉果吸潮。
干燥后的罗汉果果实形态自然,果皮、果肉连在一起,组织无皱缩、多孔疏松;表面呈黄绿色,色泽均匀;泡水成黄色;冲泡口感独特,保留罗汉果清香味、甜味,有茶的滋味。经检测罗汉果的含水量为10.5%,维生素C的含量为26.56mg/g,多糖的含量为0.14%。
将同批次的新鲜罗汉果用直接烘干法烘干,检测维生素C的含量和多糖的含量,多糖保留率提高8.5%,维生素C的保留率提高28.6%。
实施例2
本发明采用如下工艺流程:
鲜罗汉果→后熟→清洗→漂烫→打孔→微波真空干燥
(1)后熟:将新鲜罗汉果摊放后熟8天,使部分水分挥发,皂苷类物质积累,促进罗汉果成熟;
(2)清洗:选用5#罗汉果,用饮用水将罗汉果表面的泥沙杂质洗净;
(3)漂烫:先配制漂烫液,往饮用水中加入质量分数为0.1%的茶多酚,0.05%的异VC钠,并用柠檬酸调节溶液pH至4.0;加热到90℃,将清洗后的鲜果置于90℃的漂烫液中漂烫2min;
这种漂烫能杀灭鲜罗汉果中酶和细菌,保护罗汉果干燥后的颜色,增强果皮韧性,保持果型,为干燥后的罗汉果独特口味形成打下基础;
(4)打孔:在罗汉果鲜果外部打3个孔,孔径为2.0mm,深度2.0cm,为罗汉果果实内水分挥发提供通道,加快干燥速度,同时避免炸果现象;
(5)微波真空干燥:
采用上海镧泰微波设备制造有限公司的VP-018A微波动态真空干燥机进行干燥。将打孔后的罗汉果鲜果1000个放入动态微波真空干燥设备的塑料筐内,按照操作规程操作,控制干燥的工艺参数控制如下:真空度为80KPa,干燥一段温度控制为:上限50℃,下线45℃,最高55℃,时间70分钟;干燥二段温度控制为:上限55℃,下线50℃,最高58℃,时间120分钟;干燥三段温度控制为:上限55℃,下线50℃,最高57℃,时间40分钟;干燥四段温度控制为:上限58℃,下线52℃,最高58℃,时间40分钟。出料,进行放置冷却,真空包装,防止干罗汉果吸潮。
干燥后的罗汉果果实形态自然,果皮、果肉连在一起,组织无皱缩、多孔疏松;表面呈黄绿色,色泽均匀;泡水成黄色;冲泡口感独特,保留罗汉果清香味、甜味,有茶的滋味。经检测罗汉果的含水量为12.8%,维生素C的含量为31.87mg/g,多糖的含量为0.16%。
将同批次的新鲜罗汉果用直接烘干法烘干,检测维生素C的含量和多糖的含量,多糖保留率提高9.5%,维生素C的保留率提高31.2%。
Claims (3)
1.一种微波真空干燥罗汉果的方法,采用如下工艺流程:
鲜罗汉果→后熟→清洗→漂烫→打孔→微波真空干燥
其特征在于:
所述后熟,将新鲜罗汉果摊放后熟;
所述漂烫,将清洗后的鲜果置于90-95℃的漂烫液中漂烫1-5min;
所述漂烫液中加入质量分数为0.1-0.5%的茶多酚,0.05%的异VC钠,并用柠檬酸调节溶液pH至4.0-5.0;
所述打孔,在漂烫后的罗汉果顶部果蒂和底部果脐处打孔,孔径为1.5-2.5mm,孔深度2.0-3.0cm;也可以直接把孔打穿;
所述微波真空干燥,将打孔后的罗汉果放入动态微波真空干燥设施内,按照操作规程操作,控制干燥的工艺参数控制如下:真空度为80-95KPa,温度50-60℃,微波动态干燥机内干燥3-5小时,罗汉果的含水量低于14%。
2.根据权利要求1所述的方法,其特征在于:所述微波真空干燥,采用上海镧泰微波设备制造有限公司的VP-036A微波动态真空干燥机,将打孔后的罗汉果鲜果1800个放入动态微波真空干燥设备的塑料筐内,按照操作规程操作,控制干燥的工艺参数控制如下:真空度为95KPa,温度50℃,微波动态干燥机内干燥4小时。
3.按照权利要求1所述方法得到的干罗汉果。
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