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当往某些溶液中加入一定量的酸和碱时，有阻碍溶液pH变化的作用，称为缓冲作用，这样的溶液叫做缓冲溶液。弱酸及其盐的混合溶液（如HOAc与NaOAc），弱碱及其盐的混合溶液（如NH3·H2O与NH4Cl）等都是缓冲溶液。生化实验室常用的缓冲系主要有磷酸、柠檬酸、碳酸、醋酸、巴比妥酸、Tris（三羟甲基氨基甲烷）等系统。
配制缓冲液时，通常需要先称取一定量的酸和碱溶于水中，例如配制1L PBS磷缓冲液时,需先称取0.24g磷酸二氢钾(KH2PO4)、1.44g磷酸氢二钠(Na2HPO4)、8.0g氯化钠(NaCl)和0.2g氯化钾(KCl)，一共四次称量，特别麻烦。有没有什么办法避免这些繁琐的称量步骤呢？！瑞典Medicago公司为此提供了解决方案。其生产的Medicago片状缓冲剂，可直接溶于无菌水中而配制出相应体积的缓冲液，无需再麻烦地称量，大大节省宝贵的实验时间，真正做到了省时，方便，精确！这些片状缓冲剂由于品质高、价格低又使用方便而广为世界各地客户所欢迎。
瑞典Medicago公司在中国只有一家授权代理商，即上海博升生物科技有限公司
Medicago常用缓冲液片剂如下：
Borate Buffered Saline (BBS) pH 8.2/硼酸盐缓冲液片剂
| Article No | Product name | Pack Size | Solution Vol | Price |
| 09-2053-100 | BBS pH 8.2 | 100 tablets | 500 ml/tablet | 1965.00 |
Carbonate bi-carbonate Coating Buffer pH 9.6/重碳酸盐缓冲液
| Article No | Product name | Pack Size | Solution Vol | Price |
09-8922-8 | Carbonate bi-carbonate | 8 tablets | 100 ml/tablet | 255.00 |
09-8922-24 | Carbonate bi-carbonate | 24 tablets | 100 ml/tablet | 510.00 |
09-8932-8 | Carbonate bi-carbonate 0.05% azide | 8 tablets | 100 ml/tablet | 510.00 |
09-8932-50 | Carbonate bi-carbonate 0.05% azide | 50 tablets | 100 ml/tablet | 1065.00 |
09-8922-100 | Carbonate bi-carbonate | 100 tablets | 100 ml/tablet | 840.00 |
IMAC Phosphate & Elution Buffer Tablets/IMAC磷酸盐洗脱液片剂
| Article No | Product name | Pack Size | Solution Vol | Price |
09-1010-10 | IMAC phosphate buffer | 10 tablets | 400 ml/tablet | 480.00 |
09-1010-50 | IMAC phosphate buffer | 50 tablets | 400 ml/tablet | 975.00 |
09-1012-10 | IMAC elution buffer | 10 tablets | 100 ml/tablet | 570.00 |
09-1012-50 | IMAC elution buffer | 50 tablets | 100 ml/tablet | 1620.00 |
PBS-Tween tablets - Phosphate Buffered Saline with Tween? 20 pH 7.4/吐温20-PBS缓冲液片剂Ph7.4
Article No | Product name | Pack Size | Solution Vol | Price |
09-9410-10 | PBS-T pH 7.4 | 10 tablets | 1000 ml/tablet | 600.00 |
09-9410-100 | PBS-T pH 7.4 | 100 tablets | 1000 ml/tablet | 2970.00 |
09-8902-100 | PBS-T pH 7.4 | 100 tablets | 500 ml/tablet | 1875.00 |
09-8903-100 | PBS-T pH 7.4 | 100 tablets | 100 ml/tablet | 480.00 |
09-8902-12 | PBS-T pH 7.4 | 12 tablets | 500 ml/tablet | 435.00 |
Phosphate Buffered Saline (PBS) pH 7.4 and 7.2/磷酸盐PBS缓冲液pH7.4和7.2
Article No | Product name | Pack Size | Solution Vol | Price |
09-9400-10 | PBS tablets pH 7.4 | 10 tablets | 1000 ml/tablet | 555.00 |
09-2052-100 | PBS tablets pH 7.4 | 100 tablets | 200 ml/tablet | 705.00 |
09-2051-100 | PBS tablets pH 7.4 | 100 tablets | 100 ml/tablet | 420.00 |
09-8912-100 | PBS tablets pH 7.4 | 100 tablets | 500 ml/tablet | 1530.00 |
09-8912-12 | PBS tablets pH 7.4 | 12 tablets | 500 ml/tablet | 360.00 |
09-9400-100 | PBS tablets pH 7.4 | 100 tablets | 1000 ml/tablet | 2745.00 |
09-9499-100 | PBS tablets pH 7.2 | 100 tablets | 1000 ml/tablet | 2745.00 |
Phosphate Buffered Saline (PBS) without potassium pH 7.4/无钾磷酸盐缓冲液pH 7.4
Article No | Product name | Pack Size | Solution Vol | Price |
09-9500-100 | PBS without potassium pH 7.4, 0.02 M phosphate | 100 tablets | 1000 ml/tablet | 3180.00 |
09-9420-100 | PBS without potassium pH 7.4 | 100 tablets | 1000 ml/tablet | 2745.00 |
09-9420-10 | PBS without potassium pH 7.4 | 10 tablets | 1000 ml/tablet | 555.00 |
TBS-Tween Tablets - Tris Buffered Saline with Tween? 20 pH 7.6/吐温20-TBS缓冲液片剂pH7.6
Article No | Product name | Pack Size | Solution Vol | Price |
09-7510-10 | TBS-T pH 7.6 | 10 tablets | 500 ml/tablet | 435.00 |
09-7510-100 | TBS-T pH 7.6 | 100 tablets | 500 ml/tablet | 2175.00 |
SSPE (PBS-EDTA) Buffer pH 7.4/SSPE缓冲液pH7.4
Article No | Product name | Pack Size | Solution Vol | Price |
09-8952-100 | SSPE, pH 7.4 | 100 tablets | 200 ml/tablet | 765.00 |
Tris Buffered Saline (TBS) pH 8.0 and 7.6/TBS缓冲液pH8.0和7.6
Article No | Product name | Pack Size | Solution Vol | Price |
09-7500-10 | TBS pH 7.6 | 10 tablets | 500 ml/tablet | 375.00 |
09-7500-100 | TBS pH 7.6 | 100 tablets | 500 ml/tablet | 1875.00 |
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