Antioxidant Capacity and Total Phenolic Content of Fresh, Oven-Dried and Stir-Fried Tamarind Leaves

Leng, Lee Yit; Nadzri, Nuramira binti; Shaari, Abdul Razak; Razak, Norawanis binti Abdul; Khor, C. Y.

doi:10.12944/crnfsj.5.3.13

Cited by 16 publications

(14 citation statements)

References 24 publications

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“…It was believed that kenaf leaves extract prepared by oven drying improved the antioxidant properties. This result is in accordance with a previous study (Brozkova et al, 2016) which stated that oven drying of kenaf leaves can serve as a post-harvest storage method while improving the antioxidant activities (Mediani et al, 2014;Leng et al, 2017). A more recent study suggested that fresh kenaf leaves had the lowest value in the antioxidants activities test when compared to dried kenaf leaves (Sim and Nyam, 2019).…”

Section: Antioxidant Activities Of Kltsupporting

confidence: 91%

The infusion of goji berries and red dates ameliorates the overall qualities of kenaf leaves tea

Goh¹,

Ng²,

Nyam³

2021

IFRJ

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Kenaf (Hibiscus cannabinus) is an industrial crop in Malaysia, and especially used as a source for composite wood. Kenaf leaves as a by-product of the plantation can be consumed as food due to its high nutritional value. Kenaf leaves have high antioxidant properties, thus are suitable to be made into herbal tea. However, its flavour is considered sour, thus presenting a challenge for product development. The main objective of the present work was to evaluate the physicochemical and functional (ascorbic acid content, calcium content, and anti-diabetic) properties of kenaf leave tea (KLT) with 0, 60, and 100% kenaf leaves used. KLT was prepared by steaming and drying the kenaf leaves, followed by sieving. Then, the powder was mixed with distilled water at 1% (w/v). Another portion of red dates and goji berries tea (RGT) was prepared by boiling the red dates:goji berries:water at 1:2.5:28.5 ratio. Two portions of tea were infused using 60% KLT and 40% RGT. Results showed that a 100% KLT (positive control) was always highest in terms of total phenolic content (TPC) and total flavonoid content (TFC). The antioxidant activities were positively correlated with DPPH and ABTS scavenging activities, and ferric reducing antioxidant power (FRAP). Contrary, the negative control (0% KLT) showed the highest α-amylase inhibitory effect. The present work also evaluated the acceptance of consumers using the Hedonic sensory test among 50 panellists with balance male and female candidates. Since 100% KLT extract was in low pH values (2.17 ± 0.26), 60% KLT infused with goji berries and red dates gained the highest consumers' acceptance. Therefore, as a compromise between sensory and functional properties, a maximum of 60% KLT was a suitable formulation for the consumers.

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Section: Antioxidant Activities Of Kltsupporting

confidence: 91%

The infusion of goji berries and red dates ameliorates the overall qualities of kenaf leaves tea

Goh¹,

Ng²,

Nyam³

2021

IFRJ

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“…Leng et al [ 27 ] compared the total content of phenolic compounds and the antioxidant capacity of fresh tamarind ( Tamarindus indica L.) leaves dried at 60 °C for 3 h or dried at 180 °C for 10 min. The total antioxidant capacity and total phenolic compound content in the extract were highest in the case of leaves dried at 180 °C.…”

Section: Drying the Plant Materialsmentioning

confidence: 99%

Modern Methods of Pre-Treatment of Plant Material for the Extraction of Bioactive Compounds

et al. 2022

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In this review, recent advances in the methods of pre-treatment of plant material for the extraction of secondary metabolites with high biological activity are presented. The correct preparation of the material for extraction is as important as the selection of the extraction method. This step should prevent the degradation of bioactive compounds as well as the development of fungi and bacteria. Currently, the methods of preparation are expected to modify the particles of the plant material in such a way that will contribute to the release of bioactive compounds loosely bonded to cell wall polymers. This review presents a wide range of methods of preparing plant material, including drying, freeze-drying, convection drying, microwave vacuum drying, enzymatic processes, and fermentation. The influence of the particular methods on the structure of plant material particles, the level of preserved bioactive compounds, and the possibility of their release during the extraction were highlighted. The plant material pre-treatment techniques used were discussed with respect to the amount of compounds released during extraction as well their application in various industries interested in products with a high content of biologically active compounds, such as the pharmaceutical, cosmetics, and food industries.

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“…A standard curve was prepared by gallic acid at different concentrations to calculate the total phenol content. Total phenol was reported as mg gallic acid equivalents (GAE) L −1 [26].…”

Section: Total Phenolsmentioning

confidence: 99%

The Effects of Halomonas sp. and Azotobacter sp. on Ameliorating the Adverse Effect of Salinity in Purple Basil (Ocimum basilicum L.)

Salimi¹,

Etemadi²,

Eshghi³

et al. 2021

Preprint

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The role of plant growth-promoting rhizobacteria (PGPR) on enhancing tolerance of plants to abiotic stresses is well reported, but the effects of RGPRs on plants under salinity stress are not widely studied in the literature. Our study aimed to investigate the effect of Halomonas sp. and Azotobacter sp. on antioxidant activity, secondary metabolites, and biochemicals changes of purple basil under salinity stress conditions. The applied salt concentrations in this study were 50, 100, and 150 mM sodium chloride (NaCl). Salinity stress had a negative effect on plant growth parameters. Moreover, a reduction in some of the osmolytes and oxidative stress markers was observed. Inoculated plants ameliorated the oxidative damage by reducing the hydrogen peroxide (H2O2) contents and by increasing osmolytes (proline, total proteins, and soluble sugars), antioxidant enzymes activities (catalase, ascorbate peroxidase) and secondary metabolites (flavonoids). Overall, among treatments, plants inoculated with Azotobacter showed a better impact on physiological attributes to alleviate the adverse effects of 150 mM NaCl salinity stress on basil growth.

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Antioxidant Capacity and Total Phenolic Content of Fresh, Oven-Dried and Stir-Fried Tamarind Leaves

Cited by 16 publications

References 24 publications

The infusion of goji berries and red dates ameliorates the overall qualities of kenaf leaves tea

The infusion of goji berries and red dates ameliorates the overall qualities of kenaf leaves tea

Modern Methods of Pre-Treatment of Plant Material for the Extraction of Bioactive Compounds

The Effects of <em>Halomonas </em>sp. and <em>Azotobacter </em>sp. on Ameliorating the Adverse Effect of Salinity in Purple Basil (<em>Ocimum basilicum</em> L.)

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