Effects of four different washing agents on microbial load, biochemical properties, heavy metals and pesticides residues in sweet potato leaves (Ipomoea batatas (L.) Lam)

• Main Authors: Fang, Lim Shu, Ramarao, Kivaandra Dayaa Rao, Razali, Zuliana, Somasundram, Chandran
• Format: Article
• Published: Faculty of Science, Chiang Mai University 2021
• Subjects: Q Science (General); QH301 Biology
• Online Access: http://eprints.um.edu.my/26423/

This study was carried out to evaluate the effects of common household washing agents: (5.25% sodium hypochlorite (Clorox); 5 % acidity apple cider vinegar, and lemon juice) on microbial load, biochemical properties, heavy metals and pesticides residue in Ipomea. batatas leaves. The results showed that Clorox treated samples contained the lowest microbial load (4.67 +/- 0.15 log CFU/ml) whereas tap water treated samples retained the highest microbial load at 5.35 +/- 0.08 log CFU/ml. For antioxidants analysis, the highest total flavonoid content (TFC) and total polyphenol content (TPC) was recorded in tap water treated samples at 7.068 +/- 0.061 mg CE/100 g DW (dry weight) and 46.219 +/- 1.106 mg GAE/100 g DW, respectively. There was no significant difference (p > 0.05) in the ascorbic acid content for all treated samples. For all the washing treatments, heavy metal and pesticide residues fell below the concentration limit set by the Malaysian Food Regulation 1985, which makes them safe for consumption.