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全新的制药方法

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    全新的制药方法(第1/2页)
    到了夜晚,草庐中点起一盏小小的油灯。这通常是师徒二人碰撞思想火花的时间。孙思邈会拿出白日里遇到的疑难病例,或者自己苦思不得其解的医学难题,与李玉探讨。而李玉,则会小心翼翼、有选择地抛出一些来自现代医学的理念,与孙思邈那博大精深的传统中医体系相互印证、融合。
    比如关于细菌和感染,孙思邈起初将信将疑,但当他结合自己见过的无数痈疽、疮疡、丹毒等感染性疾病的症状、发展、传染特点,再对照李玉描述的微虫繁殖、释放毒素模型,越思考越觉得豁然贯通。许多之前模糊的、归于邪毒、火毒笼统概念的现象,似乎有了更具体的解释。他开始尝试在治疗外伤时,更加注重清洁,甚至接受了李玉提出的沸水煮布、火焰灼器的建议,效果竟真的比以往好了不少!这更坚定了孙思邈对李玉那些奇谈怪论的重视。
    这一晚,月色清辉如水银泻地,将小小的院落照得一片澄明。秋虫在草丛中低吟,更显山居之幽静。师徒二人对坐在院中的石桌旁,桌上摊开一张粗纸,上面放着孙思邈刚刚研磨好的一小堆深褐色药粉。旁边点着一盏防风琉璃灯,灯火如豆,映照着两人专注的面容。
    这药粉非同小可,乃是孙思邈耗费多年心血,在古方基础上大胆改良而成的太乙神精丹。此丹立意高远,旨在攻克一些疑难杂症、沉疴痼疾,尤其对某些痰瘀互结、毒邪内伏的险症有奇效。然而,因其方中大胆使用了砒霜、水银等剧毒之物,以毒攻毒,药性极为猛烈霸悍,如同驾驭烈马,稍有不慎,剂量偏差一丝,或是炼制火候、配伍稍有差池,救命的仙丹立刻便会化为夺命的毒药!因此,孙思邈虽已反复验证,却始终不敢轻易用于临床,一直将其视为未完善的半成品。
    “师父,这太乙神精丹的方义,以砒霜、水银为君,直捣病巢,涤荡顽痰瘀毒,构思可谓奇险精妙。”李玉捏起一小撮药粉,放在指尖,借着灯光仔细观察,又用指腹极其小心地捻了捻,感受其质感。他眉头微蹙,摇了摇头。
    “哦?徒儿觉得有何不妥?”孙思邈抚着银须,目光炯炯地看着他。他知道自己这个弟子,眼光往往独到。
    “方子本身,徒儿不敢妄议。只是这成药……”
    李玉将指尖的药粉展示给孙思邈看,“师父您看,这药粉的颗粒,大小太不均匀了。粗的如同细沙,细的才堪堪如尘。若是让病人服用,吸入呼吸道或吞入腹中,粗颗粒与细颗粒在体内的溶解、吸收速度必然天差地远。这不仅导致药效无法平稳释放,起效时间难以控制,更重要的是,含有砒霜、水银这等剧毒成分,剂量便是生死线!?如此粗细不一的粉末,根本无法精确控制每次服用的实际药量!可能这次服下的粗粒多,毒性便猛;下次细粉多,药力又不足。这其中的风险,实在太大了!”
    孙思邈闻言,长叹一声,脸上露出深以为然的忧虑之色:“徒儿所言,正是为师多年来夙夜忧心之处!古法研磨,全凭药杵石臼,人力有时而穷。想要将砒霜、水银这等坚硬或特殊的药材研磨至完全均匀、细腻如尘,非数日苦功不可,且过程中极易混入石屑、灰尘等杂质,反增其害。更要紧的是,有些药材,如方中的苍术、厚朴,其药效精华在于其辛香走窜的挥发油。若经久研久磨,或后续煎煮时间过长,这宝贵的挥发之气便散逸殆尽,药效大减。这粗细与保真之间,实难两全啊!”
    (本章未完,请点击下一页继续阅读)全新的制药方法(第2/2页)
    这正是传统中药炮制中的经典难题:粉碎度与有效成分保留的矛盾。
    李玉听着师父的感叹,眼中光芒闪动,他等的就是这个机会。放下药粉,眨了眨清澈的眼睛,看似随意地问道:“师父,那若是用水飞法来处理此药,不知可否?”
    “水飞法?”孙思邈一怔,随即失笑摇头,“徒儿,你莫非糊涂了?水飞法乃是炼制矿物药,如朱砂、雄黄、滑石粉时所用之法。借水研磨,利用粗细颗粒在水中沉降速度不同,反复淘洗,取其最细腻悬浮之粉末,以达到极细、极纯的目的。可我们这太乙神精丹乃是多种草药与矿物混合而成,且多数是植物药,如何能用水飞?入水则药性流失,成分混杂,岂不坏了方子?”
    李玉却站起身,走到院角那盘沉重的石磨旁,轻轻拍了拍磨盘,转身看向孙思邈,语气带着一种探索的兴奋:“师父,徒儿以为,万物之理,或有相通。水飞之精髓,在于分选提纯,取其至精至’。植物药固然怕久浸流失,但我们是否可以将药材先行干燥,研磨至尽可能细的粉,然后再入水飞之法?”
    他走回石桌边,用手指蘸了点茶水,在桌上画着示意图:“譬如,我们将配好的药材,先以普通之法捣为粗末。然后放入盛有清水的石臼或陶缸中,加水至适量,用力搅拌或研磨,使极细的药粉悬浮于水中。静置片刻,粗粒下沉,我们小心舀取上层的混浊液,此液中便是最细微的药粉。将此液静置沉淀,倾去上层清水,取得底层湿泥状的极细药粉,再小心阴干。如此反复数次,便可得到颗粒均匀、极其细腻的药粉。”
    他抬头看着陷入沉思的孙思邈,继续道:“此法虽繁,但可得极致均匀之粉末。对于苍术、厚朴这类含挥发油的药材,我们或可单独处理,甚至最后一步再加入,以最大限度地保留其辛香之气。或者,我们索性将这类药材,研磨成极细粉末后,不与其他药同煎,而是让病人用温水或药汁直接冲服,使其迅速吸收,岂不更好?”
    “水飞草药……后下或冲服保留挥发……”孙思邈猛地站起身,也顾不得仪态,围着石桌开始快速地踱步,银白的须发在月光下微微颤动。他口中念念有词,眼中精光闪烁,时而蹙眉,时而展颜。李玉的话,仿佛一道闪电,劈开了他心中关于制药的某个顽固壁垒!
    “妙啊!妙极!妙不可言!”孙思邈猛地停步,一掌拍在石桌上,震得灯焰摇曳,他满脸激动地看向李玉,“好徒儿!你这脑袋里究竟还装着多少这般奇思妙想?这已不仅是改良一味药,这是要革新制药之法啊!将水飞原理用于草药提纯,分开处理不同性质的药材以保药效……此等思路,闻所未闻,却又合情合理!若此法可行,太乙神精丹的难题,或许真能解决!”
    孙思邈被这个想法彻底点燃了。困扰他多年的瓶颈,似乎看到了突破的曙光!
    李玉心中暗笑。他不过是把现代药剂学中,增加药物比表面积以提高生物利用度、保护热不稳定或易挥发有效成分、粉末分级技术等基本原理,用这个时代能够理解和实现的水飞法、分步处理等具体操作包装了出来。但对孙思邈而言,这无疑是打开了一扇通往更精准、更高效制药的新世界大门。
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