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Mass Spectrometric Analysis of Glycosphingolipid Antigens
Published on: April 16, 2013
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评估用葡萄糖巨酸量化酸的方法
Madison L Dirks1, Joseph Hale2, Eric Theiste2
1Biomolecular Sciences Graduate Programs, College of Arts and Sciences, Boise State University, Boise, ID 83725, USA.
Foods (Basel, Switzerland)
|November 27, 2025
概括
染色学是乳制品行业在糖巨 (GMP) 中量化N-乙神经胺酸 (NANA) 的最佳方法. 这种方法为GMP中NANA分析提供了卓越的精度和准确性,GMP是专门食品中的关键成分.
科学领域:
- 乳制品科学 乳制品科学
- 分析化学 分析化学
- 食品科学 食品科学 食品科学
背景情况:
- 从乳清中提取的葡萄糖巨 (GMP) 对于因缺乏氨酸而对基尿安全食品至关重要.
- GMP是高度糖化,具有多个N-乙神经胺酸 (NANA) 附着位点.
- 目前在乳制品蛋白质中的NANA量化缺乏标准化的行业方法,利用色度,度,酶和色谱技术.
研究的目的:
- 评估和比较使用GMP作为目标分析物的各种NANA量化方法.
- 为乳制品行业确定最合适的GMP中NANA测量方法.
- 评估基于测定时间,蛋白质特异性,线性,精度和准确性的方法.
主要方法:
- 评估多种NANA量化技术,包括色度,度,酶和色谱程序.
- 这些方法应用于商业GMP产品.
- 使用尖峰和恢复实验验选择的方法的验证.
主要成果:
- 在乳制品行业的背景下,染色学成为GMP中NANA量化最有利的方法.
- 染色学方法在GMP中平均NANA含量为6.18%±0.12%,相对标准偏差最低 (1.94%).
- 尖峰和恢复实验验验证了染色学方法,显示平均恢复率为90.25%.
结论:
- 建议使用染色学作为行业标准的方法来量化GMP中的NANA.
- 与其他评估的技术相比,这种方法提供了更高的精度和准确性.
- 这些发现支持在GMP中NANA的可靠测量,这对于其在专业食品中的应用至关重要.
相关概念视频
03:38Polyprotic Acids
Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
03:55Titration Calculations: Weak Acid - Strong Base
Calculating pH for Titration Solutions: Weak Acid/Strong Base
For the titration of 25.00 mL of 0.100 M CH3CO2H with 0.100 M NaOH, the reaction can be represented as:
For the titration of 25.00 mL of 0.100 M CH3CO2H with 0.100 M NaOH, the reaction can be represented as:
02:08Titration of a Polyprotic Acid
A polyprotic acid contains more than one ionizable hydrogen and undergoes a stepwise ionization process. If the acid dissociation constants of the ionizable protons differ sufficiently from each other, then the titration curve for such polyprotic acid generates a distinct equivalence point for each of its ionizable hydrogens. Therefore, titration of a diprotic acid results in the formation of two equivalence points, whereas the titration of a triprotic acid results in the formation of three...
01:08Titration of a Weak Acid with a Weak Base
Weak acids and bases do not undergo dissociation completely, and titrations between these two are rarely studied. When such studies are performed, say, for the titration of a weak acid with a weak base, the titration curve plots the change in pH as a function of the volume of base added. Take the titration of acetic acid with ammonia, for instance. During the titration, these two species form ammonium acetate and water, but the pH change is slow and gradual.
As a result, there is no simple...
As a result, there is no simple...
01:18Titration of Polyprotic Base with a Strong Acid
The titration of a polyprotic base such as sodium carbonate with a strong acid such as hydrochloric acid results in two equivalence points on the titration curve. At the first equivalence point, the carbonate ions in the base are completely converted to bicarbonate ions. The second equivalence point corresponds to the complete conversion of bicarbonate ions to carbonic acid, which dissociates into carbon dioxide and water. The region before the first equivalence point corresponds to the...
01:30Titration of a Weak Acid with a Strong Base
In titrating a weak acid with a strong base, different calculation methods are applied at various stages. Initially, the pH of a weak acid like acetic acid is calculated using its dissociation constant (Ka) and an ICE table. Upon addition of a strong base such as sodium hydroxide, a buffer forms, and its pH is determined using the Henderson-Hasselbalch equation. As more base is added and the titration reaches the halfway point, the pH becomes equal to the pKa of the acid, indicating equal...