Extraction and partial purification of protease from Bilimbi (Averrhoa bilimbi L.) / Normah Ismail and Nur' Ain Mohamad Kharoe

Ismail, Normah and Mohamad Kharoe, Nur' Ain (2013) Extraction and partial purification of protease from Bilimbi (Averrhoa bilimbi L.) / Normah Ismail and Nur' Ain Mohamad Kharoe. Scientific Research Journal, 10 (2). pp. 29-49. ISSN 1675-7009

Official URL: https://srj.uitm.edu.my/


Unripe and ripe bilimbi (Averrhoa bilimbi L.) were ground and the extracted juices were partially purified by ammonium sulfate precipitation at the concentrations of40 and 60% (w/v). The collected proteases were analysed
for pH, temperature stability, storage stability, molecular weight distribution, protein concentration and protein content. Protein content of bilimbi fruit was 0.89 g. Protease activity ofboth the unripe and ripe fruit were optimum at pH 4 and 40°C when the juice were purified at 40 and 60% ammonium sulfate precipitation. A decreased in protease activity was observed during the seven days of storage at 4°C. Molecular weight distribution indicated
that the proteases protein bands fall between 10 to 220 kDa. Protein bands were observed at 25, 50 and 160 kDa in both the unripe and ripe bilimbi proteases purified with 40% ammonium sulfate, however, the bands were more intense in those from unripe bilimbi. No protein bands were seen in
proteases purified with 60% ammonium sulfate. Protein concentration was higher for proteases extracted with 40% ammonium sulfate at both ripening stages. Thus, purification using 40% ammonium sulfate precipitation could
be a successful method to partially purify proteases from bilimbi especially from the unripe stage.


Item Type: Article
Email / ID Num.
Ismail, Normah
Mohamad Kharoe, Nur' Ain
Subjects: Q Science > QK Botany > Oxalidaceae (Wood sorrel)
Q Science > QP Physiology > Animal biochemistry > Proteolytic enzymes. Proteases
S Agriculture > S Agriculture (General) > Fertilizers and improvement of the soil > Ammonium sulfate
Divisions: Universiti Teknologi MARA, Shah Alam > Research Management Centre (RMC)
Journal or Publication Title: Scientific Research Journal
UiTM Journal Collections: UiTM Journal > Scientific Research Journal (SRJ)
ISSN: 1675-7009
Volume: 10
Number: 2
Page Range: pp. 29-49
Keywords: bilimbi, Averrhoa bilimbi L., protease, purification, ammonium sulfate
Date: 2013
URI: https://ir.uitm.edu.my/id/eprint/13046
Edit Item
Edit Item


[thumbnail of AJ_NORMAH ISMAIL (2) SRJ 13.pdf] Text

Download (1MB)

ID Number




Statistic details