CN1323724C - 获得2-18f-氟-2-脱氧-d-葡萄糖(18f-fdg)溶液的方法 - Google Patents

获得2-18f-氟-2-脱氧-d-葡萄糖(18f-fdg)溶液的方法 Download PDF

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CN1323724C
CN1323724C CNB03809035XA CN03809035A CN1323724C CN 1323724 C CN1323724 C CN 1323724C CN B03809035X A CNB03809035X A CN B03809035XA CN 03809035 A CN03809035 A CN 03809035A CN 1323724 C CN1323724 C CN 1323724C
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彼得勒斯·S·克鲁伊杰
赫克托·H·奈特卡斯特罗
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Abstract

本发明涉及改进18F-氟-脱氧-葡萄糖(18F-FDG)溶液的一或多种理化性质的方法,如降低辐射分解,以及高压灭菌能力,该方法包括步骤a)制备18F-氟-脱氧-葡萄糖(18F-FDG)溶液,b)加入至少一种基于弱酸的缓冲液。本发明还涉及通过高压灭菌制备无菌18F-氟-脱氧-葡萄糖(18F-FDG)溶液的方法。

Description

获得2-18F-氟-2-脱氧-D-葡萄糖(18F-FDG)溶液的方法
发明领域
本发明涉及获得2-[18F]-氟-2-脱氧-D-葡萄糖(18F-FDG)溶液的方法(也描述为18F-氟-脱氧-葡萄糖或18F-FDG)溶液,其具有改进的理化性质,即放射化学稳定性,如此可得到无菌的,18F-FDG溶液。
技术背景
近些年来,在核医学领域,化合物18F-FDG,除用于心脏病学和神经病学的重要用途外,还表现出可用于检测常规方法不能检测的癌组织,或纠正这些疾病的误诊。这是利用当它们变得恶性时发生在细胞中的基本变化;癌细胞失去了它们有效转化葡萄糖为能量的能力。结果,它们需要更多葡萄糖,高达20到50倍。
18F-FDG通常利用全自动合成仪制备。因为该化合物需要注射到患者,注射前含该化合物的溶液需要灭菌。但是,通过标准高压灭菌步骤化合物的放射化学纯度显著降低,这样的化合物将不能符合欧洲和美国药典的规定。此外,合成后,由于辐射分解(radiolysis)和放射性同位素的半衰期18F-FDG快速丧失其放射化学纯度,这样就限制了该化合物的使用期限。
发明内容
本发明意图提供可高压灭菌的18F-氟-脱氧-葡萄糖或(FDG)溶液,其仍符合生产后8小时放射化学纯度高于95%的规定。此外,本发明还提供降低,合成后,溶液中18F-FDG的辐射分解效果。
本发明研究发现,缓冲18F-FDG溶液对理化性质,例如放射稳定性,有强影响。令人惊奇地是发现基于弱酸的缓冲液改进了18F-FDG溶液理化性质,即放射稳定性,其可以进行高压灭菌并保持至少95%的放射化学纯度。
按照本发明可通过以下步骤实现:
a)准备18F-氟-脱氧-葡萄糖(18F-FDG)溶液,
b)向该18F-氟-脱氧-葡萄糖(18F-FDG)溶液中添加至少一种基于弱酸的缓冲液。
所述弱酸缓冲液必须是生理可接受的,并优选柠檬酸缓冲液,乙酸缓冲液,抗坏血酸缓冲液或这样缓冲液的组合。
当柠檬酸缓冲液低于5.5,具体2和5.5之间可以获得改进的理化性质。对于乙酸缓冲液,可在pH3.0到5.5之间获得这些性质。抗坏血酸缓冲液的使用pH类似于乙酸缓冲液,在3.0到5.5之间。
(18F-FDG)溶液的高压灭菌在110Ec和150EC之间进行,优选130-140EC,更优选134EC。考虑18F-FDG溶液稳定性和放射同位素半衰期,发现这些温度是优化的。18F-FDG溶液的高压灭菌在1-30分钟之间进行,优选1-10分钟,更优选2-5分钟。考虑18F-FDG溶液稳定性和放射同位素半衰期,其是109.8分钟,这些范围是优化的。
具体实施方式
本发明由以下实施例进一步说明,但它们并非对本发明的限制:
实施例1:在pH4.5-5.5对18F-FDG溶液进行高压灭菌
进行3个试验轮次研究用弱酸缓冲的18F-氟-2-脱氧-葡萄糖(FDG)溶液的放射化学纯度,与盐水中非缓冲溶液对比。
生产后,用盐水稀释18F-氟-脱氧-葡萄糖(FDG)溶液至在ART(ActivityRefeence Time)(t=0)放射活性浓度3mCi/ml。生产2小时后,制备有0.5ml 18F-氟-脱氧-葡萄糖(FDG)溶液的小瓶,混合0.1ml缓冲液(10mM),然后高压灭菌。
表1表明不同缓冲的18F-氟-脱氧-葡萄糖(FDG)溶液在134℃5分钟高压灭菌后的放射化学纯度。采用KAVO SterimasterTM在高压灭菌后直接进行。
表1
在pH 4.5到5.5对18F-FDG溶液进行高压灭菌
 18F-FDG的放射化学纯度(%)
  试验1   试验2   试验3
  未高压灭菌   98.85   96.41   95.9
  高压灭菌的缓冲液/pH
  抗坏血酸/4.5   94.5   95.0   94.7
  抗坏血酸/5.5   94.1   94.4   94.5
  柠檬酸/4.5   97.3   96.5   96.3
  柠檬酸/5.5   94.5   95.3   94.1
  乙酸/4.5   96.5   94.6   94.5
  乙酸/5.5   94.5   92.5   92.5
  NaCl/6.2(参照)   92.4   90.9   91.1
所有测试缓冲液相对未缓冲参照样品NaCL/pH6.2获得高的放射化学纯度。得到最佳结果的缓冲液是pH4.5的柠檬酸缓冲液。与未高压灭菌样品相比,三个试验中只有一个表现出放射化学纯度降低1%(试验1)。
实施例2:低pH范围(pH2-3)18F-FDG溶液的高压灭菌
进行2轮试验研究用弱酸缓冲到pH2-3的18F-氟-脱氧-葡萄糖(FDG)溶液的放射化学纯度。
用盐水将18F-氟-脱氧-葡萄糖(FDG)溶液在生产后直接稀释到在ART(12:00h)放射化学纯度3mCi/ml。生产2小时后,制备有0.5ml 18F-氟-脱氧-葡萄糖(FDG)溶液的小瓶,其混有0.1ml缓冲液(100mM),然后高压灭菌。
表2表明了不同缓冲的18F-氟-脱氧-葡萄糖(FDG)溶液在134℃5分钟高压灭菌后的放射化学纯度。
  缓冲液   pH  18F-FDG的放射化学纯度(%)
  试验1   试验2
  抗坏血酸   3.0   97.8   98.0
  柠檬酸   2.0   98.7   98.5
  乙酸   3.0   97.4   97.3
  NaCl(参照)   6.2   90.9   91.1
所有测试缓冲液较未缓冲参照样品NaCl/pH6.2表现出高的放射化学纯度。与对照样品相比(放射化学纯度降低9%),用弱酸缓冲的样品观察到2-3%的降低。对于所有缓冲液(抗坏血酸,柠檬酸,乙酸),与未高压灭菌样品(表1)相比,没有显著的放射化学纯度降低。
实施例3:18F-FDG的辐射分解
在约8.5小时的时期内测定18F-FDG的放射性浓度。在ART(t=0)放射性浓度为3mCi/ml。
测试2个缓冲液,并与0.9%NaCl/pH6.9中的参照样品相对比。第一个缓冲液是柠檬酸缓冲液pH4.5,第二个缓冲液是抗坏血酸缓冲液pH4.5。在间隔中进行样品放射化学纯度的5个测定。结果见表3。
表3:18F-氟-脱氧-葡萄糖(FDG)溶液的辐射分解
  缓冲液/pH   测定时间(min)  18F-FDG百分比
  柠檬酸缓冲液pH4.5   0   98.98
  46   98.03
  203   96.18
  317   95.31
  495   94.73
  抗坏血酸缓冲液pH 4.5   0   98.98
  64   97.96
  213   97.55
  327   97.37
  505   97.28
  0.9%NaCl pH6.90   0   98.98
  94   96.51
  230   94.74
  340   94.13
  516   93.59
在两个测试缓冲液辐射分解较0.9%NaCl样品降低。当采用抗坏血酸缓冲液观察到最大降低。8.5小时后只有2%活性降低。对于柠檬酸缓冲液和0.9%NaCl分别是4%和6%。结论是,与不加缓冲液相比,在加入抗坏血酸或柠檬酸缓冲液后,18F-FDG更稳定。
实施例4:18F-氟-脱氧-葡萄糖(FDG)溶液的高压灭菌和辐射分解
18F-FDG的辐射分解在高压灭菌样品后约7.5小时时期内进行。测试两个缓冲液,并与0.9%NaCl pH6.90向对照。第一个是柠檬酸缓冲液pH4.5,第二个缓冲液是抗坏血酸缓冲液pH4.5。在间隔进行样品放射化学纯度的三个测定。结果见表4。
表4
18F-氟-脱氧-葡萄糖(FDG)溶液的高压灭菌和辐射分解
         18F-FDG的放射化学纯度(%)
              高压灭菌   未高压灭菌
  测定时间(min)   柠檬酸   抗坏血酸   NaCl   NaCl
  0   97.37   95.56   89.56   97.49
  240   95.55   94.65   87.49   95.30
  453   95.35   94.50   86.77   94.61
加入弱酸缓冲液后,18F-FDG在高压灭菌下更稳定。不加该缓冲液,样品的放射化学纯度显著降低到低于90%。与抗坏血酸相比,柠檬酸缓冲液产生更好的稳18F-FDG定性效果。此外,辐射分解,在高压灭菌后,与NaCl样品对照,测试的两个缓冲液都显著降低。采用抗坏血酸缓冲液时,观察到最大的降低。7.5小时后只有1%的活性降低。对于柠檬酸缓冲液和NaCl样品此降低分别是2%和3%。结论是,加入抗坏血酸和柠檬酸后,与不加这些缓冲液相比,在高压灭菌中更为稳定。高压灭菌后,两个缓冲液中的18F-FDG溶液的辐射分解都降低。

Claims (15)

1.改进18F-氟-脱氧-葡萄糖溶液的一或多种理化性质的方法,该方法包括如下步骤:
a)准备18F-氟-脱氧-葡萄糖溶液,
b)向该18F-氟-脱氧-葡萄糖溶液中添加至少一种基于弱酸的缓冲液,其中所述至少一种缓冲液选自柠檬酸,乙酸,抗坏血酸,或其组合。
2.权利要求1的方法,其中所述改进的理化性质是18F-氟-脱氧-葡萄糖溶液的高压灭菌能力,从而使该溶液适于医疗用途。
3.权利要求1的方法,其中所述改进的理化性质是在18F-氟-脱氧-葡萄糖溶液中降低的辐射分解。
4.权利要求1的方法,其中所述柠檬酸缓冲液pH低于5.5。
5.权利要求4的方法,其中所述柠檬酸缓冲液pH在2和5.5之间。
6.权利要求1的方法,其中所述乙酸缓冲液的pH在3和5.5之间。
7.权利要求1的方法,其中所述抗坏血酸缓冲液的pH在3和5.5之间。
8.制备无菌18F-氟-脱氧-葡萄糖溶液的方法,所述方法在至少一种基于弱酸的缓冲液的存在下,在110℃到145℃之间的温度下,对18F-氟-脱氧-葡萄糖溶液进行高压灭菌,其中所述至少一种缓冲液选自柠檬酸,乙酸,抗坏血酸,或其组合。
9.权利要求8的制备无菌18F-氟-脱氧-葡萄糖溶液的方法,其中在130℃到140℃之间的温度下,对18F-氟-脱氧-葡萄糖溶液进行高压灭菌。
10.权利要求9的制备无菌18F-氟-脱氧-葡萄糖溶液的方法,其中在134℃的温度下,对18F-氟-脱氧-葡萄糖溶液进行高压灭菌。
11.权利要求8的方法,其中所述高压灭菌过程为1到30分钟。
12.权利要求8的方法,其中所述高压灭菌过程为1到10分钟。
13.权利要求8的方法,其中所述高压灭菌过程为2到5分钟。
14.由权利要求1的方法得到的具有改进的理化性质的18F-氟-脱氧-葡萄糖溶液。
15.权利要求8的方法得到的无菌18F-氟-脱氧-葡萄糖溶液。
CNB03809035XA 2002-04-24 2003-04-23 获得2-18f-氟-2-脱氧-d-葡萄糖(18f-fdg)溶液的方法 Expired - Fee Related CN1323724C (zh)

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EP1356827A1 (en) 2003-10-29
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CA2483181A1 (en) 2003-11-06
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