Antioxidant activities and phenolic contents of the extracts in different loquat (Eriobotrya japonica) cultivars

Flavanoid, steroid, and terpenoid contents of 20 Manokwari medicinal plants were analyzed. The antioxidant activity, total phenolic contents and antitumor activity of 20 Manokwari medicinal plants were also evaluated. The result shows that 83% positif to flavanoid test, 59% positif to terpenoid test and only 25% positif steroid. Antioxidant activity and total phenolic contents evaluated using Ferric Thiocianate (FTC) and Folin-Ciocalteu methods respectively. Antioxidant activity and total phenolic contents of medicinal plants were extracted by the traditional method, boiling in water and also in 80% methanol. Twenty plants evaluated in both exstracts have significantly varies of antioxidant activities and phenolic contents, A significant and linier correlation coefficient between the antioxidant activity and the total phenolic content was found in both aqueous (R2= 0,77) and methanol (R2 = 0,85). Antitumor activity was tested using cell maurine P-388 and only 2 of medicinal plants are active to inhibit cell maurine P-388. Comparing extraction efficiency of the two methods, the methanol extracted phenolic compounds more efficiently, and antioxidant activity of the extract was higher.

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Antioxidant Activities of Extract Fractions of Leaves from Loquat (Eriobotrya japonica Lindl.) by Cultivars

Journal of the Korean Society of Food Science and Nutrition ◽

10.3746/jkfn.2012.41.8.1029 ◽

2012 ◽

Vol 41 (8) ◽

pp. 1029-1034 ◽

Cited By ~ 1

Author(s):

Hyun-Jin Shin ◽

Kyoung-Hee Kim ◽

Hye-Rim Hwang ◽

Na-Young Kim ◽

Sung-Hwan Kim ◽

...

Keyword(s):

Antioxidant Activities ◽

Eriobotrya Japonica

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Phenolic Profiles and Antioxidant Activities of 30 Tea Infusions from Green, Black, Oolong, White, Yellow and Dark Teas

Antioxidants ◽

10.3390/antiox8070215 ◽

2019 ◽

Vol 8 (7) ◽

pp. 215 ◽

Cited By ~ 18

Author(s):

Cai-Ning Zhao ◽

Guo-Yi Tang ◽

Shi-Yu Cao ◽

Xiao-Yu Xu ◽

Ren-You Gan ◽

...

Keyword(s):

Antioxidant Activities ◽

Dry Weight ◽

Trolox Equivalent Antioxidant Capacity ◽

Total Phenolic ◽

Antioxidant Power ◽

Phenolic Contents ◽

Tea Infusions ◽

Phenolic Profiles ◽

Trolox Equivalent ◽

Ferric Reducing Antioxidant Power

Tea is among the most consumed drink worldwide, and its strong antioxidant activity is considered as the main contributor to several health benefits, such as cardiovascular protection and anticancer effect. In this study, the antioxidant activities of 30 tea infusions, which were obtained by the mimic of drinking tea of the public, from green, black, oolong, white, yellow and dark teas, were evaluated using ferric-reducing antioxidant power (FRAP) and Trolox equivalent antioxidant capacity (TEAC) assays, ranging from 504.80 ± 17.44 to 4647.47 ± 57.87 µmol Fe2+/g dry weight (DW) and 166.29 ± 24.48 to 2532.41 ± 50.18 µmol Trolox/g DW, respectively. Moreover, their total phenolic contents (TPC) were detected by Folin-Ciocalteu assay and were in the range of 24.77 ± 2.02 to 252.65 ± 4.74 mg gallic acid equivalent (GAE)/g DW. Generally, Dianqing Tea, Lushan Yunwu Tea, and Xihu Longjing Tea showed the strongest antioxidant activities among 30 teas. Furthermore, the phenolic compounds in tea infusions were identified and quantified, with catechins most commonly detected, especially in green tea infusions, which were main contributors to their antioxidant activities. Besides tea polyphenols, considerable content of caffeine also presented in 30 tea infusions.

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Chlorophyll and total phenolic contents, antioxidant activities and consumer acceptance test of processed grass drinks

Journal of Food Science and Technology ◽

10.1007/s13197-016-2380-z ◽

2016 ◽

Vol 53 (12) ◽

pp. 4135-4140 ◽

Cited By ~ 9

Author(s):

Wiwat Wangcharoen ◽

Suthaya Phimphilai

Keyword(s):

Antioxidant Activities ◽

Consumer Acceptance ◽

Total Phenolic ◽

Acceptance Test ◽

Phenolic Contents ◽

Total Phenolic Contents ◽

Consumer Acceptance Test

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Determination of phenolic contents and antioxidant activities of extracts of Jatropha curcas L. seed shell, a by-product, a new source of natural antioxidant

Industrial Crops and Products ◽

10.1016/j.indcrop.2014.04.031 ◽

2014 ◽

Vol 58 ◽

pp. 265-270 ◽

Cited By ~ 38

Author(s):

Rao Fu ◽

Yuting Zhang ◽

Yiran Guo ◽

Fengxia Liu ◽

Fang Chen

Keyword(s):

Jatropha Curcas ◽

Antioxidant Activities ◽

Natural Antioxidant ◽

Jatropha Curcas L ◽

Phenolic Contents

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Sugar Types, Phenolic Contents, and Antioxidant Activities for 17 Saudi Arabian Date Cultivars and Their Relations with Glycemic Indices

International Journal of Fruit Science ◽

10.1080/15538362.2018.1535356 ◽

2018 ◽

Vol 19 (3) ◽

pp. 315-325 ◽

Cited By ~ 3

Author(s):

Ragab A El-Mergawi ◽

Metab A AlGeffari ◽

Abdulrohman Al-Humaid

Keyword(s):

Antioxidant Activities ◽

Saudi Arabian ◽

Phenolic Contents ◽

Glycemic Indices

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Comparison of hot water and methanol extraction combined with ultrasonic pretreatment on antioxidant properties of two pigmented rice cultivars

Food Research ◽

10.26656/fr.2017.4(2).330 ◽

2019 ◽

Vol 4 (2) ◽

pp. 547-556

Author(s):

U. Tobgay ◽

P. Boonyanuphong ◽

P. Meunprasertdee

Keyword(s):

Conventional Method ◽

Antioxidant Activities ◽

Hot Water ◽

Red Rice ◽

Rice Varieties ◽

Ultrasonic Pretreatment ◽

Phenolic Contents ◽

Pigmented Rice ◽

Methanol Extraction ◽

Glutinous Rice

Pigmented rice is considered as the good source of phytochemicals which contains more phenolic contents and higher antioxidant activities compared with non-pigmented rice. However, those phytochemicals are normally extracted using inorganic solvent, using water was rarely found. This study was aimed to compare extraction methods on antioxidant contents and activities of two types of Thai pigmented rice (black glutinous rice and red non-glutinous rice). Pigmented rice was extracted either conventional method alone or a combination of ultrasonic plus conventional method with different solvents (methanol and hot water). Phenolic contents were analyzed by spectrophotometric assay and high-performance liquid chromatography (HPLC). Antioxidant activities were investigated by radical scavenging capacity (ABTS and DPPH). The results showed that ultrasonic pretreatment significantly enhanced the total phenolic, flavonoid, anthocyanin contents and higher antioxidant activities compared with conventional extraction irrespective of solvents and rice varieties. Ultrasonic methanol (UM) extraction proved to extract significant higher content of all the compounds analyzed in both the rice varieties. In contrast, hot water (HW) extracts exhibited the lowest amount of bioactive compounds. However, there was no significant difference between methanol extraction alone and ultrasonic pretreatment with hot water extract on antioxidant contents for black glutinous rice. The contents of individual anthocyanins and flavonoids (cyanidin 3-O-glucoside, peonidin 3-O-glucoside, and quercetin) were significantly increased with ultrasonic pretreatment compare to the conventional method in black glutinous rice while failed to detect the red rice variety. The black glutinous rice contained significantly higher contents of all analyzed compounds and antioxidant activities than red rice. In conclusions, our results demonstrated that ultrasonic pretreatment significantly enhanced antioxidant extraction with higher activities compared with conventional extraction irrespective of solvents and rice varieties. Furthermore, the efficiency of ultrasonic together with hot water extraction was almost equal to methanol extraction which was the one effective solvent for extracting antioxidant.

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