Journal
NATURAL PRODUCT RESEARCH
Volume 36, Issue 14, Pages 3756-3760Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786419.2021.1881096
Keywords
Microwave assisted extraction; Senna alata; antioxidant; kaempferol 3-gentiobioside; kaempferol; aloe emodin
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Funding
- Ministry of Higher Education Malaysia [FRGS/1/2016/TK02/UMP/02/4 (RDU 16024)]
- Universiti Malaysia Pahang [RDU1803121]
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This study investigated the optimum processing conditions of microwave assisted extraction of anthraquinone and flavonoids from Senna alata leaves, finding that MAE had a greater extraction rate compared to ultrasonic-assisted and maceration methods. The highest yields were obtained at 90.5% ethanol, 18.6 W/mL microwave power, with a desirability of 0.82, showing positive correlation between yield of compounds and antioxidant activity.
This paper investigates the optimum processing conditions of microwave assisted extraction (MAE) of anthraquinone (aloe emodin, AE) and flavonoids (kaempferol 3-gentiobioside, K3G and kaempferol, KA) from Senna alata (L.) Roxb. The kinetic study indicates that MAE showed a greater extraction rate, compared to ultrasonic-assisted and maceration, due to the enhanced power which altered the leaf microstructures. The optimisation was undertaken using one-factor-at-a-time, two-level factorial design and central composite design were used to maximise the yield of the target compounds. The optimum yield of K3G (4.27 mg/g DW), KA (8.54 mg/g DW) and AE (0.86 mg/g DW) was obtained at 90.5% ethanol, microwave power of 18.6 W/mL with a desirability of 0.82. In addition, the yield of K3G and KA is correlated positively with the antioxidant activity.
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