2025年2月1日 · 13C urea and citric acid are medicines used in a diagnostic test called Exalenz BreathID® non-invasive breath test. It is a test that analyzes a breath sample before and after taking 13C-enriched urea to help diagnose patients with infections in the stomach caused by a bacteria called H. pylori.

尿素-13C是一种13c标记的 尿素分子，用于诊断由幽门螺杆菌引起的胃溃疡。 在幽门螺杆菌存在的情况下，尿素 C-13 被尿素酶代谢，在胃上皮和管腔之间的界面处产生氨和放射性二氧化碳，13c标记的尿素被血液吸收并在呼出时容易被检测。 尿素-13C理化性质. 中文名：尿素-13C. 英文名：Urea-13C; CAS号：58069-82-2. SMILES：C (=O) (N)NInchiInChI=1S/CH4N2O/c2-1 (3)4/h (H4,2,3,4)/i1+1. InchiKey：XSQUKJJJFZCRTK-OUBTZVSYSA-N. 分子式：H2N*CONH2. 分 …

Urea, also called carbamide (because it is a diamide of carbonic acid), is an organic compound with chemical formula CO (NH2)2. This amide has two amino groups (– NH2) joined by a carbonyl functional group (–C (=O)–). It is thus the simplest amide of carbamic acid. [6]

2024年5月12日 · ★尿素（urea/bun）：是人体蛋白质代谢的主要终末产物。 蛋白质分解代谢后，氨基酸脱氨基产生 NH3和 CO2，两者在肝脏中合成尿素，每1g蛋白质代谢产生 尿素/肌酐（UREA/CREA）及临床意义

Urea 13C is a urea molecule radiolabelled with the non-radioactive element carbon-13. It is currently used for the Urea Breath Test (UBT) and is available as a rapid diagnostic test (marketed as Pranactin-Citric) for the detection of Helicobacter pylori infections.

2015年11月30日 · Urea C-13 is a diagnostic agent used for the detection of urease associated with Helicobacter pylori in the human stomach and initial diagnosis or post-treatment monitoring of Helicobacter pylori infection in adults. Urea 13C is a urea molecule radiolabelled with the non-radioactive element carbon-13.

尿素（Urea），又称脲、碳酰胺，化学式是CH 4 N 2 O或CO(NH 2) 2 ，是一种白色晶体，无味无臭，易溶于水、 乙醇 和苯，微溶于乙醚、氯仿。 尿素是最简单的有机化合物之一，是哺乳动物和某些鱼类体内蛋白质代谢分解的主要含氮终产物，可以用作化肥、动物饲料 ...

The 13 C-urea breath test [5] detecting gastric Helicobacter pylori infection is probably the best known, best standardised and most widely used breath test. 13 C-urea is hydrolysed by the bacterial urease activity to 13 C-labelled carbon dioxide and ammonia.

尿素c-14一种小分子药物，目前该药物最高研发阶段为批准上市，用于治疗幽门螺杆菌感染。 尿素C-14_Urea C-14-靶点_适应症: 幽门螺杆菌感染-临床_专利_批准

Record the peak intensities at mass-to-charge ratios of 60, 61, 62, and 63. Calculate the percentage of carbon that is C 13 in the portion of Urea C 13 taken by the formula: