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Production and characterization of angiotensin converting enzyme (ACE) inhibitory peptides from apricot (Prunus armeniaca L.) kernel protein hydrolysate

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Abstract

Six different proteases (Flavourzyme®, Neutrase®, Protamex®, Alcalase® 2.4L, Proleather® FG-F, and papain) were employed to hydrolyze apricot kernel protein (AKP). Alcalase® is an inexpensive and non-specific protease that has been shown to be useful for the generation of bioactive peptides from AKP. Alcalase® 2.4L was selected for further study on enzymatic preparation of ACE inhibitory peptide from AKP. After 60-min hydrolysis, the highest ACE inhibition was 82 ± 0.14%. Results of molecular weight distribution revealed that most of ACE inhibition activity was probably attributed to low-molecular weight peptide fraction ranging from 200 to 900 Da. Ultrafiltration on membranes with several molecular weight cutoffs (MWCFs) demonstrated that most of the ACE inhibitory activity was due to peptides with a less than 1,000 Da molecular weight: the IC50 value of the 1-kDa ultrafiltrate was 0.15 ± 0.007 mg mL−1, while it was 0.378 ± 0.015 mg mL−1 before ultrafiltration. Additionally, further separation and purification of the ACE inhibitory peptides were carried out using gel filtration and C18 RP-HPLC. The result of research can be used to optimize AKP enzymatic hydrolysis for producing ACE inhibitory peptides which could be used for food industry and nutraceuticals.

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Acknowledgments

This work has received financial support from project 2009JM 3021 (Shaanxi Province Basic Science Research). The authors express their appreciation to Professor Dai Jun (Jiangnan University) to determine peptides molecular weight distribution.

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Authors and Affiliations

  1. College of Life Science, Shaanxi Normal University, **’an, 710062, China

    Zhenbao Zhu & Nongxue Qiu

  2. College of Life Science and Engineering, Shaanxi University of Science and Technology, **’an, 710021, China

    Zhenbao Zhu & Jianhua Yi

  3. College of Food Engineering and Nutritional Science, Shaanxi Normal University, **’an, 710062, China

    Nongxue Qiu

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  1. Zhenbao Zhu
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  2. Nongxue Qiu
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  3. Jianhua Yi
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Correspondence to Nongxue Qiu.

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Zhu, Z., Qiu, N. & Yi, J. Production and characterization of angiotensin converting enzyme (ACE) inhibitory peptides from apricot (Prunus armeniaca L.) kernel protein hydrolysate. Eur Food Res Technol 231, 13–19 (2010). https://doi.org/10.1007/s00217-010-1235-5

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  • DOI: https://doi.org/10.1007/s00217-010-1235-5

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