Cited by 100Enzyme Production and CharacterizationPineapple and bromelain studiesEnzyme Catalysis and Immobilization

Characterisation of partially purified milk-clotting enzyme from Solanum dubium Fresen seeds

Ahmed, Isam Ali Mohamed, Morishima, Isao, Babiker, Elfadil E., Mori, Nobuhiro·2009·Food Chemistry

Abstract

The seeds of Solanum dubium were blended and extracted using different types of buffers. The most reliable, quick, and efficient buffer was found to be 5% NaCl in acetate buffer (pH 5.0) which was used throughout the study. The extract was filtered and fractionated twice with ammonium sulphate. The partially purified enzyme was characterised by SDS-PAGE which showed a band of molecular weight of 66kDa with the presence of other bands of low density. When compared with other plant enzymes, S. dubium enzyme was found to have higher clotting and proteolytic activities. The activity of the enzyme was steadily increased with enzyme and substrate concentration. The enzyme was found to be very stable against a wide range of pH values as well as a wide range of temperature (20-90°C). The results of substrate specificity of the enzyme showed that the partially purified enzyme preferred both hydrophilic and hydrophobic amino acid residues at P1 position. The catalytic efficiency of the purified enzyme was enhanced by an aliphatic amino acids (Leu) compared to aromatic residue (Phe) at P1 position at the same site.

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Crossref · 10.1016/j.foodchem.2008.11.072

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  • Ahmed et al. (2009a) found that milk-clotting activity of enzyme extract from Solanum dubium was 880 MCU and calf rennet was 2,496 MCU at 37 °C.

    “Ahmed et al. (2009a) compared the milk-clotting activity of enzyme extract from Solanum dubium with calf rennet and found that the milk-clotting activity was 880 and 2,496 MCU at 37 °C, respectively.”

    From Plant proteases as milk-clotting enzymes in cheesemaking: a review (2014) · cites this paper as Ahmed et al. (2009a)

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Authors
Ahmed, I. A. M., Morishima, I., Babiker, E. E., & Mori, N.
Affiliations
Tottori University (JP)
Venue
Food Chemistry
Publisher
Elsevier BV
Published
2009-09
Volume
116
Issue
2
Pages
395-400
ISSN
0308-8146 (ISSN-L)
OpenAlex
W2037441195
Cited by
100
References
21
Citations by year
2026: 3 · 2025: 6 · 2024: 5 · 2023: 9 · 2022: 8 · 2021: 6 · 2020: 3 · 2019: 8 · 2018: 6 · 2017: 10 · 2016: 7 · 2015: 6 · 2014: 7 · 2013: 6 · 2012: 4
FWCI
1.54
Type
journal article
Language
en
Open access
closed
Locations
Food Chemistry (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biotechnology › Enzyme Production and Characterization
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Pineapple and bromelain studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Enzyme Catalysis and Immobilization
Keywords
milk-clotting enzyme, seeds, proteolytic activity, enzyme purification, ammonium sulfate precipitation, substrate specificity, catalytic efficiency, thermal stability, pH stability, molecular weight

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