PABA的用法

By analyzing the spectra of 1H-NMR and 13 C-NMR of PET/ 60PHB manufactured at 275 ℃, the value of ψ has been calculated to be 0.0714, which indicates that PET and PABA are copolymerized almost in a totally random manner.

通过对275℃下制得的PET/60PHB共聚酯的~1H NMR及~（13）C NMR谱图进行分析，求得ψ值为0.0714，表明PET与PABA几乎完全是无规共聚的。

On the basis of the results of studying on PABA self-polymerization and PET alcoholysis reaction, and combine the work of this paper, the problems of enhancing the molecular weight of PET/ PHB copolyester and improving sequence distribution are discussed.

根据PABA自聚反应、PET酸解反应等研究结果，结合本文的工作，讨论了提高PET／PHB共聚酯分子量和改进序列分布的问题。

The released P-aminobenzoic acid ( PABA) is absorbed and excreted in the urine. An oral pancreatic function diagnostant ( PFD) test using BT-PABA can assess pancreatic exocrine function.

BT-PABA的胰腺功能诊断（PFD）试验，能反映胰腺外分泌功能。