CN1159208A - 盐稳定化酶制剂 - Google Patents

盐稳定化酶制剂 Download PDF

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CN1159208A
CN1159208A CN96190833A CN96190833A CN1159208A CN 1159208 A CN1159208 A CN 1159208A CN 96190833 A CN96190833 A CN 96190833A CN 96190833 A CN96190833 A CN 96190833A CN 1159208 A CN1159208 A CN 1159208A
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R·C·M·巴兰德斯
H-P·哈勒茨
R·J·贝茨
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Gist Brocades NV
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Abstract

本发明公开干的酶制剂的加工和贮存稳定性的改善方法。也就是说,将某无机盐例如MgSO4溶于含酶溶液中,接着用例如喷雾干燥法将其干燥。不但盐的加入提高了干燥后的酶活性,而且所得含酶及无机盐的固体组合物的贮存和加工稳定性也得到了改善。本发明还公开了包括酶及无机盐的固体组合物。

Description

盐稳定化酶制剂
本发明涉及酶溶液转化为固体酶制剂的方法,该方法使干燥收率、及贮存和加工稳定性均得以改善。
酶的应用领域很广,因此酶在当代科学技术中越来越重要。然而这些化合物的主要缺点之一是其容易失活,不但加工时的极端温度、pH等条件引起失活,而且在其它条件都正常时长期贮存也导致其自发失活。
本技术中已知的减轻该问题的应用方法包括:在酶的溶液中加入各种添加剂使酶稳定化,或采用冷冻干燥、喷雾干燥或适于该目的的其它技术将酶溶液转化为干制剂。当应用要求那样时通常需要将酶溶液转化为干制剂(例如适当地与其它干组分混合)。
尽管干燥法实质上对于改善酶的贮存稳定性是有效方法,但干燥处理过程中常引起很大程度的活性损失而使终产品仍易于失活。在贮存或加工期间的这种活性损失强烈地依赖于制剂的含湿量,因此,需要最严格地控制含湿量以维持如此重要的产品的稳定性。这还包括为了统一标准或其它目的严格减少适于加入最终酶产品的化合物的选用。
在很多情况下,干的酶在应用中必须混入含湿量不能如此严格地控制的制品中。这些情况下酶的稳定性急剧降低。
在干燥及后续的贮存与加工期间对酶进行稳定化以防活性损失方面已出现了一些发明。
这些发明的大多数(如专利(申请)US3515642,EP0501375A1及WO91/14773中提出的)涉及往酶浓缩物中加入糖类(具体地说是糖或多元醇组分)。
本技术中已知的方法还有:往制剂中加入某些组分使得在贮存温度下生成玻璃态产物,于是提高酶的稳定性(EP 0383569A2)。
另一个方法是往制剂中加入一种或数种可结合水分的组分。它将降低最终制剂中水的活力或暂时防止从周围环境渗入的水与酶相互作用。
应用有机和无机盐作加工助剂(如改善产品的流动性)或填充剂/标定试剂是人们熟知的方法。但是,应用无机盐提高干的酶制剂在加工或贮存期间的稳定性在本技术中看来还没有报道。在某些情况下由于加入盐而造成的酶的去稳定作用却被明确提及(例如参见:Mikhailova等,1989,Vestsi Akad Navuk BSSR,Ser BiyalNavuk 6:62-65)。
EP0522269A2中公开了往有待喷雾干燥的酶溶液中加入不溶性的碳酸钙。
WO92/11347中公开了往含酶的颗粒中混入水溶性无机盐。该水溶性无机盐必须是不影响酶颗粒的贮存稳定性。WO92/11347提出了适合于该目的的数种钠盐和钾盐。但是应在挤出造粒之前将该水溶性无机盐以干燥状态加入酶中。
本发明提出了生产具有较高的干燥收率及所得产物的较高的贮存和加工稳定性的固体酶制剂的方法。该方法的实施如下:配制含酶及水溶性无机盐(优选是二价阳离子的无机盐,更优选是锌、镁或钙盐,最优选是硫酸锌或镁)的溶液;接着将该溶液干燥。混合的盐及混合的酶也可用于此目的。二价阳离子是优选的,因为它们提供最佳贮存及加工稳定性。作为阴离子的硫酸根是优选的,因为它赋予最高的干燥收率。本发明还提出按下列方法制备的固体酶制剂,即制备含酶及水溶性无机盐(优选是二价阳离子的无机盐,更优选是锌、镁或钙盐,最优选是硫酸锌或镁)的溶液;然后将包括该酶及该水溶性无机盐的溶液干燥。
在本发明的方法中,当酶仍处于溶液中时、即在干燥之前盐就存在了。这不但导致干燥时更高的收率,而且所得干的酶制剂的贮存稳定性及其加工稳定性也得到了提高。此处的加工稳定性是指:酶制剂在除贮存以外的任意加工过程中的稳定性,例如将酶制剂与其它组分混合时或酶的应用期间。
含酶及盐的溶液干燥后会形成酶及盐分布均匀的固体组合物。
含酶及盐的溶液的干燥可用技术人员能利用的任意干燥方法来实施,例如喷雾干燥、冷冻干燥、真空干燥、流化床干燥,以及微波干燥。酶-盐溶液的干燥也可结合粒化方法,该方法包括,例如流化床或多级干燥机(MSD)的应用。至于应用这些粒化方法,技术人员将明白所得组合物不必是完全均匀的。所得颗粒通常将包括:均匀颗粒的聚集物或者有均匀核心和均匀包被的包被颗粒及/或其组合。任何情况下都会存在酶与盐的相互均匀分散。
本发明的具体实施例证实:盐的稳定效果随着盐在酶溶液中用量的增加而增大,直至某一点后进一步增加盐的用量不再提高酶的稳定性。基于该原因,应加入至少5%、优选是至少15%、更优选是至少30%、还要更优选的是至少60%、最优选是至少90%(w/w)的盐于酶溶液中,其中盐的用量表示成加入的盐基于溶液中的酶的重量百分比(w/w),不包括结晶盐中结晶水的重量。
尽管从本发明来看盐的加入没有上限,但盐在酶浓缩物中的最大溶解度使之有物理限度。因此只能通过稀释酶溶液或应用盐的复合物来实现较高的盐/酶比。
另一需考虑的要点可能是酶被“盐析”时的用量,这取决于盐的类型及所考虑的特定的酶。本发明不排除引起“盐析”现象的盐和酶的复合物。
本发明可用于任何类型的酶或酶的混合物,包括但不局限于植酸酶及其它的磷酸酶、淀物酶、蛋白酶、脂肪酶及磷脂酶、纤维素酶如β-葡聚糖酶、果胶酶、半纤维素酶如木聚糖酶及其它的植物细胞壁降解酶、酯酶、粗制凝乳酶如真菌蛋白酶或凝乳酶、以及β-半乳糖苷酶。应注意,每当谈到“酶”或“一种酶”时,这些术语也包括酶的混合物,而不考虑这类混合物是从单一发酵直接得到的、还是从不同的发酵中得到的酶混合而成的;还包括重组生物体的发酵得到的酶。酶优选选自真菌植酸酶、真菌半纤维素酶、真菌纤维素酶及细菌蛋白酶。酶更优选地选自从属于Raper和Fennell定义的(1965,In:The Genus Aspergillus,The Williams&Wilkins Company,Baltimore,pp 293-344)黑曲酶(Aspergillusniger)类型的真菌得到的植酸酶及内切木聚糖酶、从木霉菌属(Trichoderma)菌种得到的β-葡聚糖酶及内切木聚糖酶、以及从芽胞杆菌属(Bacillus)菌种得到的蛋白酶。
本发明还公开了包括至少一种酶及一种无机盐的固体组合物,其中无机盐的用量至少是酶重量的5%(w/w)。无机盐优选是二价阳离子的盐,更优选是锌、镁或钙盐,最优选是硫酸锌或镁。无机盐在组合物中的用量至少是酶重量的5%(w/w)、优选至少是15%,更优选至少是30%,还要更优选的是至少60%以及最优选的是至少90%。可制成本发明的组合物的酶包括上述的所有那些酶、尤其是那些优选的酶。
在本发明的另一个实施方案中,上述固体组合物被用于制备动物饲料。动物饲料的制备常包括造粒步骤,在此期间酶活性会大量降低。应用本发明的固体组合物会减少造粒期间酶活性的损失。典型的动物饲料组合物包括供给能量的植物来源原料及有助于生长的代谢物。饲料中添加矿物质及维生素,并且通常把动物脂肪及动物蛋白加入饲料中。
在本发明的又一个实施方案中,公开了包括具有改善了的贮存稳定性的植酸酶的固体组合物。固体组合物中植酸酶的贮存稳定性是这样的:在30℃下、优选是在密闭容器中、贮存8周期间,初始植酸酶活性的损失少于35%、优选少于20%、更优选少于10%且最优选少于5%。植酸酶组合物可以包括:生理上可接受的有机或无机载体(例如基于谷类的载体如粗麦粉、小麦面粉、稻壳等等,其它的有机载体如木薯淀粉、马铃薯淀粉、蔗糖等等,无机载体如氯化钠、硫酸钾、二氧化硅等等),以及植酸酶,为了官能性或方便的缘故可能混有其它酶,以及进一步改善产品的外观或官能性如颜色、流动性、物理、化学或微生物稳定性、气味、味道、粉尘形成等等的试剂。技术人员会明白除了植酸酶外还可制备用作饲料酶的类似组合物。
提出下述实施例作为对本发明的阐述。
实施例
实施例1
将含大约11wt%的酶的真菌植酸酶浓缩物(Gist brocades生产并提供)分为两份。在其中的一份中加入240g/l的MgSO4·7H2O。待盐溶解后得澄清溶液。将两份溶液用Buchi试验规模喷雾干燥机喷雾干燥,干燥机入口温度为130℃、出口温度为85℃。
将所得粉状物与粗麦粉以1∶10的重量比混合以抵销两份制剂间存在的水分活度的任何差异。平衡后通过测定水份活度即可证实这一点,测得二者在室温下水分活度为0.45。
然后将终产物于30℃下贮存于密闭的坛子里,贮存后同时分析产物的酶活性。贮存8周之后,未加盐的制剂的活性损失达35%,而加盐的制剂只损失5%。
实施例2
在两份大约含12wt%的酶蛋白质的由芽胞杆菌得到的碱性蛋白酶浓缩物(Genencor International Inc.生产并提供)中,分别溶解0和85g/l的MgSO4·OH2O。然后用Niro STREA-1实验室规模流化床涂布机将这些浓缩物涂到硫酸钠载体上。该处理过程的活性损失分别为28%和14%。
将所得颗粒与过量的含漂白剂的欧洲市场上的商品化洗涤剂粉混合后,置于开口坛子内,于35℃及55%的相对湿度下保温。贮存6周后,加盐和未加盐的制剂的残余酶活性分别为42%和30%。
实施例3
将240g/l的MgSO4·7H2O溶于一份总的干物质含量为25wt%、含β-葡聚糖酶及内切木聚糖酶、由木霉菌属得到的酶浓缩物(Gist-brocades生产并提供)中。将所得溶液及原浓缩物用GlattWSG-60流化床涂布机分别涂到硫酸钠载体上。该处理过程中加盐的酶浓缩物中β-葡聚糖酶和内切木聚糖酶的活性损失分别为5%和10%,而未加盐的酶浓缩物中两种酶的活性损失分别为10%和25%。
将所得颗粒在30℃及62%的相对湿度下保温。贮存12周之后加盐和未加盐的酶制剂中β-葡聚糖酶活性损失分别为10%和不能检出的,而内切木聚糖酶活性损失分别为10%和25%。
还将该颗粒与饲料混合物掺混并于70℃下进行中试规模的造粒处理。加盐和未加盐的颗粒中β-葡聚糖酶的活性损失分别达46%和59%、而内切木聚糖酶的活性损失分别为37%和66%。
造粒处理中应用的饲料混合物组成如下:
成分                         %(w/w)
玉米                          50.00
豌豆(22.9%粗蛋白质)          3.50
脱脂黄豆(45.5%粗蛋白质)      28.00
木薯淀粉                      2.38
动物粉(58%粗蛋白质)          3.60
鱼粉(72.7%粗蛋白质)          1.00
水解羽毛粉                    1.00
豆油                          1.75
动物脂肪                      3.50
维生素/矿物质预混合物         3.15
石灰石                        0.86
磷酸一钙                      0.96
氯化钠                        0.30
实施例4
将不同量的硫酸镁各溶于100ml的软化水中,然后各加入100ml的约含17wt%纯酶的真菌植酸酶浓缩物(Gist-brocades生产并提供)。混匀后用实验室规模Buchi 900 MiniSpray Dryer将所得溶液喷雾干燥,干燥机的入口/出口温度各为140和80℃。
将所得颗粒与粗麦粉以1∶9的比率混合。平衡后测定对照样及最高盐用量的试样35℃下的水分活度值、以除去水分活度效应。接着将混合物置于密封瓶中于35℃下保温8周,随后测定活性损失值。
将测得的结果列于下表:
    MgSO4-用量[g/g酶]   混合物的水分活度[-]     35℃下贮存8周后的活性损失
    O0.310.611.191.842.38     0.292----0.303     52%37%26%15%15%17%
实施例5
按实施例4中所述方案,每100ml植酸酶浓缩物中各加入80mmol用量的不同的盐而制备稳定化酶颗粒。与粗麦粉的混合及稳定性测试均类似于实施例4。
将结果列于下表:
    盐的类型   水分活度[-]   喷雾干燥损失 35℃下贮存8周后的损失
    无硫酸镁氟化镁硝酸镁硫酸锌氯化锌氯化钙硝酸钙硫酸钠硫酸钾硫酸铵     0.29-0.300.31-------     6%7%26%32%5%48%40%44%11%17%6%     52%15%43%27%9%5%18%13%51%36%46%
实施例6
应用实施例5中所述方法,制备不含盐、含硫酸镁或硫酸锌的3种含植酸酶的溶液。接着用冷冻干燥代替喷雾干燥将这些溶液干燥。冷冻干燥是通过将装有酶/盐混合液的烧瓶浸入液氮中、然后抽成高真空而脱水来完成的。用研钵将所得干制剂研碎,并与粗麦粉混合,然后置于密封瓶中于35℃下贮存8周后测定其稳定性。将结果列于下表:
    盐的类型   混合物的水分活度   35℃下贮存  8周后的活性损失
    无硫酸镁硫酸锌     0.310.31-     46%16%3%

Claims (16)

1.通过干燥含酶和水溶性无机盐的溶液来改善固体酶制剂的加工稳定性或贮存稳定性的方法,其中无机盐的用量至少是酶重量的5%(w/w)。
2.制备贮存稳定且加工稳定的含酶固体组合物的方法,该方法包括下列步骤:
a)制备包括酶和水溶性无机盐的溶液,其中无机盐的用量至少是酶重量的5%,以及
b)将该溶液干燥。
3.按权利要求1或2的方法,其中的无机盐包括二价阳离子。
4.按权利要求3的方法,其中的二价阳离子选自锌、镁和钙。
5.按权利要求1-4任一项的方法,其中的无机盐包括硫酸根阴离子。
6.按权利要求1-5任一项的方法,其中的酶选自下列酶:优选得自曲霉属的植酸酶、优选得自芽胞杆属的蛋白酶、优选得自曲霉属的半纤维素酶、优选得自木霉属的半纤维素酶及纤维素酶。
7.按权利要求1-6任一项的方法,其中含酶和无机盐的溶液的干燥包括采用选自喷雾干燥机、流化床干燥机及冷冻干燥机的干燥机。
8.包括至少一种酶和水溶性无机盐的固体组合物,其中无机盐的用量至少是酶重量的5%(w/w)且其中的无机盐包括二价阳离子。
9.通过下列步骤得到的固体组合物:
a)制备含酶和水溶性无机盐的溶液,其中无机盐的用量至少是酶重量的5%,以及
b)将该溶液干燥。
10.按权利要求8或9的固体组合物,其中的盐是权利要求3-5中任一项所定义的盐。
11.按权利要求8-10中任一项的固体组合物,其中的酶是权利要求6中定义的酶。
12.按权利要求8-11中任一项的固体组合物,其中的组合物中无机盐与酶是均匀分布的。
13.按权利要求8-11的固体组合物,其特征在于该组合物包括其中的无机盐和酶是均匀分布的颗粒。
14.按权利要求8-11的固体组合物,其特征在于该组合物包括其中的无机盐和酶是均匀分布的涂层。
15.含植酸酶、具有贮存稳定性的固体组合物,其特征在于:该固体组合物在30℃下贮存8周后,活性损失低于初始植酸酶活性的35%。
16.包括如权利要求8-15中任一项定义的固体组合物的动物饲料。
CN96190833A 1995-07-28 1996-07-24 盐稳定化酶制剂 Pending CN1159208A (zh)

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