The Effect of Water Stress on Bioactive Compounds in Australian-Grown Black Sesame

Hoyos, Beatriz E.; Johnson, Joel B.; Mani, Janice S.; Batley, Ryan J.; Trotter, Tieneke; Bhattarai, Surya P.; Naiker, Mani

doi:10.3390/plants13060793

Cited by 3 publications

(1 citation statement)

References 95 publications

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“…This may be caused by several aspects, namely: genetics, plant validity, growing environment, addition of growth supporting materials, harvest time, post-harvest handling, extraction technology, extract storage, extract thickening and drying technology. 17 These active compounds disrupt the activity of the bacterium S. mutans. Flavonoids exert an inhibitory effect on S. mutans by reducing Extracellular polymeric substances (EPS) formation and stimulating S. mutans to release lactate dehydrogenase (LDH).…”

Section: Discussionmentioning

confidence: 99%

Antibacterial and antibiofilm activity of mint leaves (Mentha piperita L) extracts against Streptococcus mutans UA159: a laboratory experiment

Jeffrey,

Djohan,

Soerachman

et al. 2024

Padjadjaran J Dent

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Introduction: Oral health is a major concern in healthcare worldwide, with dental caries being a prevalent issue among children and adults. Streptococcus mutans is a primary bacterium implicated in the development of dental caries due to its acidogenic nature. Mint leaf (Mentha piperita L.) is a unique herbal plant that has antibacterial and antibiofilm properties against S. mutans and minimal side effects. The purpose of this study was to analyze the antibacterial effectiveness of mint leaf against the growth of S. mutans UA159 and its antibiofilm effects. Methods: This study was conducted experimentally with the posttest-only control group design, using the broth microdilution method in 6 test groups, namely mint leaf extract with a concentration of 3.125, 6.25, 12.5, 25, 50, and 100% and also two control groups, namely the negative control using aquadest and the positive control using 0.2% chlorhexidine. Biofilm growth is determined by comparing Optical Density (OD) values and then calculating the percentage of eradication of S. mutans biofilm formation. Results: The results indicated that the mint leaf extract exhibited antibacterial effects against S. mutans, with the largest inhibition zone diameter observed at a 100% concentration. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC)90 values using the broth microdilution method in this study were 12.5% and 100% concentrations, respectively. Mint leaf extract has been shown to significantly inhibit the growth of S. mutans (p<0.05). The results of the inhibition test on biofilm formation at a concentration of 100% averaged 87.39%. Conclusion: Mint leaf extract has an antibacterial and antibiofilm effect on the growth of S. mutans. The level of inhibition of mint leaf extract on the growth of S. mutans is proportional to its concentration; the higher the concentration of the extract, the stronger the inhibitory ability.KeywordAnti-Bacterial agents, biofilms, Mentha piperita, oral health, Streptococcus mutans.

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Section: Discussionmentioning

confidence: 99%

Antibacterial and antibiofilm activity of mint leaves (Mentha piperita L) extracts against Streptococcus mutans UA159: a laboratory experiment

Jeffrey,

Djohan,

Soerachman

et al. 2024

Padjadjaran J Dent

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Optimizing Nigella Oil Extraction Temperature for Sustainable Production

Thani,

Johnson,

Bhattarai

et al. 2024

Applied Sciences

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Understanding the extraction process of Nigella oil is crucial due to its significant impact on yield, quality, and therapeutic effectiveness. This study explored the effects of various screw press temperatures (40 °C, 50 °C, 60 °C, 70 °C, and 80 °C) on the quantity and quality of Nigella oil to optimize conditions that maximize yield while maintaining its nutritional and therapeutic attributes. Our findings indicate a linear increase in oil yield as screw press temperatures rose from 40 °C to 80 °C. There were no significant differences observed in total phenolic content (TPC), cupric reducing antioxidant capacity (CUPRAC), or the composition and ratio of fatty acids across oils extracted at different temperatures. However, the ferric-reducing antioxidant power (FRAP) was highest in oils extracted at 60 °C, while the thymoquinone (TQ) content peaked between 40 °C and 60 °C. These results underscore the importance of optimizing screw press temperatures to strike a balance between maximizing oil yield and preserving its valuable therapeutic and nutritional properties

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An In-Depth Examination into How Genotype, Planting Density, and Time of Sowing Affect Key Phytochemical Constituents in Nigella sativa Seed

Thani,

Johnson,

Bhattarai

et al. 2024

Seeds

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Nigella sativa, also known as black cumin, is esteemed for its rich reservoir of health-benefitting phytoconstituents nestled within its seeds. The composition of its seeds can be influenced by factors such as genotype diversity and agricultural practices. Understanding these dynamics is important for maximizing the nutritional and medicinal attributes of the seeds. This study investigated how different genotypes, growing densities, and sowing times affect oil yield and phytoconstituents of Nigella seeds in Northern Australia. The aim was to find the optimal combination of these factors to maximize desirable compounds. Our findings revealed variability in oil yield and phytoconstituents among different genotypes, growing densities, and sowing times. No single genotype stood out as having elevated levels of all desired compounds. For instance, genotype AVTKS#5 had high total phenolic content (TPC) and antioxidant capacity, while AVTKS#8 and AVTKS#7 excelled in thymoquinone (TQ) and polyunsaturated fatty acids (PUFAs) and monounsaturated fatty acids (MUFAs), respectively. Planting density had a nuanced impact, with no significant effect on oil yield and CUPRAC values, but higher densities decreased TPC, FRAP, and TQ. Interestingly, seeds cultivated at 20 and 30 plants/m2 had higher ratios of MUFAs/SFAs, PUFAs/SFAs, and (MUFAs + PUFAs)/SFAs, indicating the importance of planting density in shaping fatty acid profiles. Sowing times also had a noticeable effect, with late sowing leading to a decrease in oil yield from 19% to 14%. May-sown seeds had higher TPC, FRAP, CUPRAC, and fatty acid ratios, while TQ levels peaked in June-sown seeds. Our study highlighted positive correlations among TPC, FRAP, CUPRAC, and TQ, emphasizing their collective contribution to the nutritional and medicinal potency of Nigella seeds. Fatty acids, on the other hand, showed no significant correlation with these parameters, indicating independent regulation. In summary, our comprehensive analysis provides insights into the factors (genotype and agronomic practice) that shape the phytochemical profile of Nigella seeds, and suggests better genotype, planting density, and time of sowing for the cultivation and quality production.

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The Effect of Water Stress on Bioactive Compounds in Australian-Grown Black Sesame

Cited by 3 publications

References 95 publications

Antibacterial and antibiofilm activity of mint leaves (Mentha piperita L) extracts against Streptococcus mutans UA159: a laboratory experiment

Antibacterial and antibiofilm activity of mint leaves (Mentha piperita L) extracts against Streptococcus mutans UA159: a laboratory experiment

Optimizing Nigella Oil Extraction Temperature for Sustainable Production

An In-Depth Examination into How Genotype, Planting Density, and Time of Sowing Affect Key Phytochemical Constituents in Nigella sativa Seed

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