USP标准物质在全球130多个国家得到广泛的认可和信任。USP 法定标准物质是原料药、辅料、杂质、降解产品、食品补充剂、药典试剂和性能校正剂的样本，其特性规定极严密。在进行法定 USP-NF 测试和化验时必须使用USP 标准物质。USP标准物质也可以用作校正剂，用于溶出、粒子计数、熔点和滴定液标定，也可以用于空白和对照实验。标准物质主要用于色谱和光谱方法。除基于USP-NF的标准物质之外，USP 还向分析、临床、制药和研究实验室提供《食品化学法典》(Food Chemicals Codex)中规定的标准物质以及纯品（优质化学样品）。
Cat. No. Description CAS No.
"1,043,003 " Ascorbic Acid (1 g) (Vitamin C) [50-81-7]
"1,043,105 " Ascorbyl Palmitate (2 g) (AS) [137-66-6]
"1,043,502 " Asparagine Anhydrous (200 mg) [70-47-3]
"1,043,513 " Asparagine Monohydrate (200 mg) [5794-13-8]
"1,043,706 " Aspartame (200 mg) [22839-47-0]
"1,043,750 " Aspartame Acesulfame (200 mg) [106372-55-8]
"1,043,728 " "Aspartame Related Compound A (25 mg) [5262-10-2]
"1,043,819 " Aspartic Acid (100 mg) [6899-03-2]
"1,044,006 " Aspirin (500 mg) [50-78-2]
"1,044,301 " Astemizole (200 mg) [68844-77-9]
"1,044,403 " Atenolol (200 mg) [29122-68-7]
"1,044,651 " Atovaquone (200 mg) [95233-18-4]
"1,044,662 " Atovaquone Related Compound A (25mg)
"1,044,800 " Atracurium Besylate (100 mg) [64228-81-5]
"1,045,009 " Atropine Sulfate (500 mg) [5908-99-6]
"1,045,337 " Avobenzone (500 mg) [70356-09-1]
"1,045,508 " Aurothioglucose (100 mg) [12192-57-3]
"1,045,600 " Azaerythromycin A (100 mg) [76801-85-9]
"1,045,756 " Azaperone (200 mg) [1649-18-9]
"1,045,803 " Azatadine Maleate (200 mg) [3978-86-7]
"1,046,001 " Azathioprine (200 mg) [446-86-6]
"1,046,056 " Azithromycin (100 mg) [117772-70-0]
"1,046,067 " Azithromycin Identity (75 mg) n/f
"1,046,090 " Azithromycin N-Oxide (15 mg) [90503-06-3]
"1,046,147 " Azo-aminoglutethimide (100 mg) n/f
"1,046,205 " Aztreonam (200 mg) [78110-38-0]
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USP标准品