Evaluation of Cytotoxicity and Flavonoid Presence of Cabbage Extract (Brassica oleracea)
Qualitative phytochemical screening and Allium cepa root growth assay evaluating the bioactivity, safety, and non-cytotoxic properties of microwave-extracted cabbage flavonoids.
Abstract & Executive Summary
The main objective of this study was to extract cabbages using microwave-assisted extract, followed by qualitative screening for the presence of flavonoids and assessing cytotoxicity of the extract. The study created 250 mL cabbage extracts at 50%v/v concentration using microwave-assisted extraction, tested for flavonoids using Alkaline Reagent Test and Concentrated Sulfuric Acid Test, and evaluated the cytotoxicity using Allium cepa Lethality Assay. Alkaline reagent phytochemical screening of cabbage extract showed strong presence of flavonoids, while concentrated sulfuric acid phytochemical test showed minimum presence of flavonoids. The Allium cepa lethality assay results showed that cabbage extract with the highest concentration (50%) had the least root length yet had no inhibitory effect on root growth. Which concludes that cabbage extract showed presence of flavonoids and is not cytotoxic. The study recommends an efficient timeframe and multiple Allium cepa replicates.
Background & Theoretical Context
Cabbage (Brassica oleracea) is rich in bioactive antioxidant flavonoids (kaempferol, quercetin, apigenin). To determine its safety profile for plant growth and postharvest preservation, this study combined rapid Microwave-Assisted Extraction (M-AE) with in vitro qualitative screening and the standard Allium cepa root tip genotoxicity/cytotoxicity model.
Methodology & Experimental Procedure
Microwave-Assisted Extraction
Prepared 50% m/v extract (125g cabbage in 250 mL distilled water) through 6 microwaving cycles (45s each, <90°C) with 1–2 min cooldown over 25 minutes (avg. temp 63.83°C).
Phytochemical Screening
Conducted Alkaline Reagent Test (2M NaOH turning intense yellow, fading to colorless with 6M HCl) and Concentrated Sulfuric Acid Test (6M H₂SO₄) to detect flavonoid presence.
Allium Cepa Lethality Assay Setup
Pre-rooted red onion bulbs in water for 24–48h, then exposed root tips across 5 concentrations for 5 days: Control (distilled water), 5% (T1), 10% (T2), 20% (T3), and 50% (T4).
Day 5 Growth Measurement
Quantified root elongation (cm) on Day 5 to assess cytotoxic inhibition compared against baseline control growth.
Empirical Findings & Data
Confirmed Flavonoid Presence
Alkaline reagent testing confirmed strong positive (+) presence of bioactive flavonoids via characteristic reversible chromogenic shifts.
Non-Inhibitory Root Growth Profile
Root lengths ranged from 1.3 cm to 2.3 cm across groups: T1 (1.7 cm), T2 (2.3 cm), T3 (1.65 cm), T4 (1.3 cm), vs Control (1.5 cm).
Absence of Acute Cytotoxicity
Even at the maximum 50% concentration (T4), root growth proceeded without lethal inhibition or cellular necrosis, demonstrating safe bioactivity.
Conclusions
Non-Cytotoxic Safety Profile
Microwave-assisted cabbage extract exhibited no toxic or genotoxic inhibition on Allium cepa root growth, validating its biological safety.
Bioactive Extraction Success
M-AE successfully extracted bioactive flavonoids without degrading beneficial phytochemical compounds.
Recommendations
Replication & ANOVA Analysis
Implement multi-bulb Allium cepa replicates per concentration group to enable statistical variance modeling with One-Way ANOVA.
Testing Higher Concentrations
Evaluate extract concentrations exceeding 60% m/v and ensure assay testing occurs within one week of extraction.
Research Paper & Data Repository
Peer-reviewed manuscripts, raw data spreadsheets, and supplementary materials.