China Animal Husbandry & Veterinary Medicine ›› 2026, Vol. 53 ›› Issue (1): 266-275.doi: 10.16431/j.cnki.1671-7236.2026.01.024

• Nutrition and Feed • Previous Articles     Next Articles

Quantification of Sterculic Acid Based on Chemical Derivatization and Mass Spectrometry Technology

WANG Furong1,2(), FENG Xiaohui2, FENG Shengnan2, ZHANG Zhengjie2, WANG Yujiao2, MENG Qingshi2(), ZHANG Chunxiang1()   

  1. 1.College of Animal Science,Shanxi Agricultural University,Taigu 030801,China
    2.State Key Laboratory of Animal Nutrition and Feeding,Institute of Animal Science,Chinese Academy of Agricultural Sciences,Beijing 100193,China
  • Received:2025-04-02 Online:2026-01-05 Published:2025-12-26
  • Contact: MENG Qingshi, ZHANG Chunxiang E-mail:wangfurong0131@163.com;mengqingshi@caas.cn;chunxiangzhang@sxau.edu.cn

Abstract:

Objective This study aimed to establish an accurate method for determining the sterculic acid content in cottonseed meal and feed to facilitate the rational utilization of cottonseed meal protein resources. Method By optimizing the reaction conditions of 2-pyridinecarboxylic hydrazide with sterculic acid, the extraction process of sterculic acid and mass spectrometry parameters, a liquid chromatography tandem mass spectrometry (LC-MS/MS) method for quantifying sterculic acid using external standards was successfully established. The performance of the method was evaluated by examining its linear range, limit of detection, limit of quantification, recovery, precision (intra-assay and inter-assay) and accuracy, along with application to analyze actual samples. Result After optimization, the optimal reaction mixture composition for the reaction of sterculic acid with 2-pyridinecarboxylic hydrazide was determined as 500 mmol/L EDC, 15 mmol/L HOAt and 40 mmol/L 2-pyridinecarboxylic hydrazide. The optimal reaction temperature and time were established as 20 ℃ and 60 min, respectively. Methanol was found to be the best extracting solution for free sterculic acid, while the best hydrolysis conditions for bound sterculic acid were 50 ℃ for 12 h. The method demonstrated a good linear relationship for sterculic acid over the range of 1 to 1 000 ng/mL, with correlation coefficients (r) all greater than 0.99. The limit of detection and limit of quantification were were determined to be 5 and 12.5 μg/kg, respectively. For free sterculic acid, the recovery ranged from 80.13% to 95.30%, with intra coefficient of variation of 1.01% to 2.21% and inter coefficient of variation of 1.61% to 2.38%. For esterified sterculic acid, the recovery ranged from 85.46% to 105.20%, with intra coefficient of variation of 0.79% to 2.01% and inter coefficient of variation of 3.40% to 6.22%. The optimized method had been successfully applied to quantified sterculic acid in cottonseed oil, cure cottonseed meal, degossypoled cottonseed meal and cottonseed protein samples, with concentrations ranging from 0.09 to 1 812.76 mg/kg. Conclusion The established LC-MS/MS method had the advantages of high sensitivity, high accuracy and high precision. It was suitable for quantifying free and esterified sterculic acid in feed and provides technical support for the appropriate utilization of cotton meal.

Key words: sterculic acid; cottonseed meal; derivatization; quantification

CLC Number: