scholarly journals The determination of vitamin C, total phenol and antioxidant activity of some commonly cooking spices crops used in West Bengal

2014 ◽  
Vol 6 (6) ◽  
pp. 66-70 ◽  
Author(s):  
Denre Manas
Keyword(s):  
Antioxidant Activity ◽  
Vitamin C ◽  
West Bengal ◽  
Total Phenol

scholarly journals Nutrients and bioactive compounds of pulp, peel and seed from umbu fruit

2019 ◽  
Vol 49 (4) ◽  
Author(s):  
Leilson de Oliveira Ribeiro ◽  
Eliseth de Souza Viana ◽  
Ronoel Luiz de Oliveira Godoy ◽  
Sidinea Cordeiro de Freitas ◽  
Suely Pereira Freitas ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Vitamin C ◽  
Bioactive Compounds ◽  
Nutritional Composition ◽  
Total Phenolic ◽  
Total Carotenoids ◽  
Fresh Pulp ◽  
Main Barrier ◽  
By Products

ABSTRACT: The objective of this research was to evaluate the nutritional composition and bioactive compounds of whole umbu fruit, including pulp, seed and peel, and also of a commercial umbu pulp. Samples of the fractions and of commercial pulp were analyzed for determination of minerals and proximate composition, total phenolic and antioxidant activity. Pulps and peel were also analyzed for vitamin C and carotenoids contents. Commercial pulp presented better nutritional composition than fresh pulp (P<0.05) and the peel presented higher phenolic content and antioxidant activity than seed. Peel also stood out by its vitamin C (79 mg.100 g-1) and total carotenoids (2,751 µg.100 g-1) contents, showing that, as the main barrier of the fruit for its protection, it is a fraction rich in bioactive compounds. The highest dietary fiber and iron contents were observed in umbu seed (P<0.05). Therefore, umbu by-products may be ingredients proper for development of food richer in nutrients and bioactive compounds.

Effervescent formulation based on variation of nanocapsules matrix type and roselle (Hibiscus sabdariffa) nanocapsules percentage

Food Research ◽  
2021 ◽  
Vol 5 (3) ◽  
pp. 53-59
Author(s):  
I.S.M. Purbowati ◽  
A. Maksum ◽  
R. Anggriawan
Keyword(s):  
Antioxidant Activity ◽  
Vitamin C ◽  
Bioactive Compound ◽  
Total Phenol ◽  
Total Phenol Content ◽  
Arabic Gum ◽  
Matrix Type ◽  
Unique Effect ◽  
The Matrix ◽  
Physical And Chemical

Roselle flowers are usually consumed in the form of fresh steeping. To increase the flexibility of using roselle, effervescent roselle-based products are made which of course more practical, efficient and attractive. Unfortunately, the bioactive compound in roselle extracts is not stable to environmental influences so nanoencapsulation technology needs to be done. The encapsulation matrix type gives a unique effect on each core. The purposes of this study were to determine the effects of variation in the matrix types and percentage of roselle nanocapsules on the physical and chemical effervescent properties. The research design used in this study was a Complete Random Design with 2 factors and 3 replications. The first factor comprised matrix types (A): maltodextrin (A1) and Arabic gum (A2). The second factor was roselle nanocapsule percentages (B): 10% (B1), 15% (B2) and 20% (B3). Observed variables in this study were total phenol, anthocyanin, vitamin C, antioxidant activity and dissolving time. The Arabic gum nano encapsulated matrix type gave a better value of Vitamin C, antioxidant activity and dissolving time than maltodextrin, namely 0.149±0.049 µg/3 g, 34.02±4.52%, 2.93±0.80 mins. The percentage of roselle nanocapsules by 20% gave the highest vitamin C value, namely 0.188±0.032 µg /3 g. The best treatment combination was obtained from the treatment (A2B3) Arabic gum nanocapsules using the third percentage (20%) with the characteristics: total phenol content 4.17 µg /3 g, anthocyanin 0.070 µg /3 g, vitamin C 0.188 µg /3 g when it dissolves in 1.25 mins.

scholarly journals Determination of the Antioxidant Activity of Samples of Tea and Commercial Sources of Vitamin C, Using an Enzymatic Biosensor

Antioxidants ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 324
Author(s):  
Danilo Braga Ribeiro ◽  
Gabriela Santos Silva ◽  
Djanira Rubim dos Santos ◽  
Andressa Rose Castro Costa ◽  
Eliane Braga Ribeiro ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Vitamin C ◽  
Prussian Blue ◽  
Chemical Species ◽  
Cobalt Phthalocyanine ◽  
Operational Parameters ◽  
Enzymatic Biosensor ◽  
Commercial Sources ◽  
Meldola Blue

Antioxidants are synthetic or natural compounds capable of preventing or delaying oxidative damage caused by chemical species that can oxidize cell biomolecules, such as proteins, membranes, and DNA, leading to the development of various pathologies, such as cancer, atherosclerosis, Parkinson, Alzheimer, and other diseases serious. In this study, an amperometric biosensor was used to determine the antioxidant activity of teas and effervescent products based on vitamin C, available on the market. A sensor composed of three electrodes was used. The performance of the following electrochemical mediators was evaluated: meldola blue combined with Reineck salt (MBRS), Prussian blue (PB), and cobalt phthalocyanine (CoPC), as well as the time of polymerization in the enzymatic immobilization process and the agitation process during chronoamperometric measurements. Prussian blue proved to be more efficient as a mediator for the desired purposes. After optimizing the construction stages of the biosensor, as well as the operational parameters, it presented stability for a period of 7 months. The results clearly indicate that the biosensor can be successfully used to detect fraud in products called “antioxidants” or even in drugs containing less ascorbic acid than indicated on the labels. The detection limit was set at 4.93 µmol·L−1.

scholarly journals Determination of Antioxidant Activity of Vitamin C by Voltammetric Methods

Proceedings ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 23 ◽  
Author(s):  
Klaudia Suliborska ◽  
Monika Baranowska ◽  
Agnieszka Bartoszek ◽  
Wojciech Chrzanowski ◽  
Jacek Namieśnik
Keyword(s):  
Antioxidant Activity ◽  
Vitamin C ◽  
Chemical Properties ◽  
Differential Pulse ◽  
Antioxidant Compounds ◽  
Redox Active ◽  
Physical And Chemical ◽  
Kinetics Of ◽  
Voltammetric Methods

Voltammetric methods—cyclic (CV) and differential pulse voltammetry (DPV) are considered the most appropriate way to evaluate antioxidant activity of redox active compounds. They provide information about both mechanism and kinetics of electrochemical oxidation of antioxidants as well as their physical and chemical properties such as the redox potential or the number of electrons transferred. These methods are helpful for understanding the mechanisms of oxidation or reduction processes of antioxidant compounds. This work presents the electrochemical properties of vitamin C obtained by both CV and DPV methods.

scholarly journals DETERMINATION OF QUALITY PARAMETERS AND TEST ANTIOXIDANT ACTIVITIES OF 70% ETHANOL EXTRACT OF SEROJA LEAVES (NELUMBO NUCIFERA GAERTN.)

2021 ◽  
pp. 30-33
Author(s):  
RATNA DJAMIL ◽  
DIAH KARTIKA PRATAMI ◽  
FEBI AYU PUTRI ◽  
THALIA BREBA OCTAVIA
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Capacity ◽  
Radical Scavenging ◽  
Ethanol Extract ◽  
Quality Parameters ◽  
Medicinal Herb ◽  
Nelumbo Nucifera ◽  
Total Phenol ◽  
Antioxidant Power

Objective: The purpose of this study was to evaluated the quality parameters and analyzed the antioxidant activity of seroja leaves Nelumbo nucifera Gaertn. Methods: The quantification of the chemical compound was determined by its total phenol and flavonoid levels. The evaluate the antioxidant activity was determined by the comparability of the four common radical scavenging assays using 2,2′-azino-bis-3-ethylbenzthiazoline-6-sulphonic acid (ABTS); 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radical; cupric ion reducing antioxidant capacity (CUPRAC); ferric reducing antioxidant power (FRAP); and 2-thiobarbituric acid (TBA) methods. Results: The results of phytochemical screening for simplicia powder and 70% ethanol extract of seroja leaves contain secondary metabolites of alkaloids, flavonoids, saponins, tannins, coumarin, quinones, and triterpenoid steroids. The results of the determination of the quality parameters meet the requirements of quality and safety standard of the medicinal herb. The result of the determination of total phenol content from 70% ethanol extract of Seroja leaves was 181.62±0.82 mg GAE/g extract. The results of the determination of total flavonoid levels from 70% ethanol extract of seroja leaves amounted to 289.83±1.04 mg QE/g extract. The results of antioxidant activity tests using the ABTS, DPPH, and TBA methods showed IC50 respectively 287.7 mg/l, 22.3 mg/l, and 352.6 mg/l and CUPRAC and FRAP methods had an antioxidant capacity of 160.76±0.35 and 253.36±0.48 mg AAE/g extract. Conclusion: Seroja leaves (Nelumbo nucifera Gaertn.) have the potential to be used as an antioxidant medicinal herb and its extract meet the standard of quality control and safety.

scholarly journals Ripening-dependent Changes in Phytonutrients and Antioxidant Activity of Red Pepper (Capsicum annuum L.) Fruits Cultivated under Open-field Conditions

HortScience ◽  
2013 ◽  
Vol 48 (10) ◽  
pp. 1275-1282 ◽  
Author(s):  
Shiva Ram Bhandari ◽  
Bo-Deul Jung ◽  
Hum-Young Baek ◽  
Young-Sang Lee
Keyword(s):  
Antioxidant Activity ◽  
Vitamin E ◽  
Vitamin C ◽  
Capsicum Annuum ◽  
Open Field ◽  
Total Phenol ◽  
Total Flavonoid ◽  
Red Pepper ◽  
Free Sugar ◽  
Β Carotene

To understand ripening-dependent changes in phytonutrients, five commercial cultivars of red peppers (Capsicum annuum L.) grown in an open field in Taean, South Korea, were selected and their fruits were harvested at green mature (GM), intermediate breaker (BR), and red ripe (RR) stages and their phytonutrient contents and antioxidant activities were compared. Three major patterns in relation to ripening progress were observed. First, continuous increases were observed in vitamin C, total phenol, vitamin E (especially α-tocopherol), total free sugar, β-carotene, linolenic acid content, and antioxidant activity. Second, decreasing patterns were observed in phytosterols (campesterol, stigmasterol, and β-sitosterol) and linoleic acid. Third, total flavonoid and squalene contents were relatively higher at the BR stage compared with the GM and RR stages. These results indicate that each phytonutrient has a unique pattern of accumulation and degradation during the fruit-maturing process. Unlike the mentioned phytonutrients, which showed similar patterns in all tested cultivars, capsaicinoids exhibited quite different patterns of ripening-dependent changes among the cultivars. Throughout the ripening processes, positive correlations with antioxidant activity were observed in vitamin E (r = 0.814**), β-carotene (r = 0.772*), vitamin C (r = 0.610**), and total phenol (r = 0.595**) contents, whereas capsaicinoids, total flavonoid, and phytosterols exhibited no or slightly negative correlations. In conclusion, the ripening of red pepper fruits is accompanied by continuous increments in various phytonutrients and subsequent antioxidant activity.

scholarly journals Fruit Pomological, Phytochemical Characteristic and Mineral Content of Rosehip Genotypes

2020 ◽  
pp. 18-23
Author(s):  
Nihal Acarsoy Bilgin ◽  
◽  
Adalet Mısırlı ◽  
Fatih Şen ◽  
Bilge Türk ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Natural Products ◽  
Vitamin C ◽  
Mineral Content ◽  
Antioxidant Activities ◽  
Total Phenol ◽  
High Demand ◽  
Nutrition And Health ◽  
Mineral Contents

Rosehips, which are commonly grown in nature in shrub form, are always popular due to their importance in terms of nutrition and health. Because fruits are rich in vitamin C, total phenol and mineral contents and antioxidant activities. Nowadays, there is high demand for natural products. Rosehip grows spontaneously in Turkey. In this study, 9 individuals were examined. Consequently, significant differences were stated according to genotypes for pomological and phytochemical characteristics. Vitamin C, phenol and antioxidant activity were found to affect P and Zn nutrients. Additionally, it was detected that P, K, Ca, Mg, Na Fe, Cu, Zn and Mn contents ranged in 0.09-0.17%, 1.35-1.86%, 1.05-1.44%, 0.43-069%, 50.00-100.00 ppm 28.50-48.30 ppm, 3.30-7.00 ppm, 8.06-12.56 ppm and 50.85-85.35 ppm, respectively. In this context, one of the genotypes has been found promising due to its content.

scholarly journals Penentuan Total Fenolik, Uji Antioksidan, Dan Uji Antibakteri Pada Ekstrak Etanol Jantung Pisang Ambon (Musa acuminate Colla)

2021 ◽  
Vol 1 ◽  
pp. 1903-1914
Author(s):  
Ratna Tri Lestari ◽  
S Slamet ◽  
W Wirasti ◽  
Urmatul Waznah
Keyword(s):  
Antioxidant Activity ◽  
Ethanolic Extract ◽  
Ethanol Extract ◽  
Total Phenol ◽  
Antioxidant Compounds ◽  
Antimicrobial Function ◽  
High Antioxidant Activity ◽  
Banana Flower ◽  
Paper Disc

AbstractBanana plant is one type of plant that contains chemical compounds that can be used for treatment. One part of the plant that has not been fully utilized is the heart of the Ambon banana (Musa acuminate Colla). Banana flower is known to contain flavonoid compounds, phenols, alkaloids, tannins, saponins, and coumarins. One of the compounds belonging to the flavonoid group which generally includes natural antioxidant compounds and has an antimicrobial function is phenolic compounds. The purpose of this study was to determine the total phenols, to examine the activity of antioxidants, antibacterials, and the ethanol extract of Ambon banana flower (Musa acuminate Colla). Determination of total phenol using the GAE (Gallic Acid Equivalence) method, antioxidant analysis using the FRAP method, and the antibacterial activity test using the paper disc method. The total phenol yield obtained was 17.7291 ± 0.102 mg GAE/g extract, the results from the antioxidant test were obtained with an EC50 value of 0.0628 µmolFe2+/g sampel extract, which means that the ethanolic extract of Ambon banana flower has a high antioxidant activity value, and antibacterial results in the extract. with a medium average (5-10 mm). From the results of tests carried out, the ethanol extract of Ambon banana flower has antioxidant activity and has little antibacterial power.Keywords : Banana plants; Ambon banana flower; antioxidants; antibacterial; total phenol AbstrakTanaman pisang merupakan salah satu jenis tanaman yang mengandung senyawa kimia yang dapat digunakan untuk pengobatan. Salah satu bagian tanaman yang belum dimanfaatkan secara maksimal adalah jantung pisang ambon (Musa acuminate Colla). Jantung pisang diketahui mengandung senyawa flavonoid, fenol, alkaloid, tannin, saponin, dan kumarin. Salah satu senyawa yang termasuk golongan flavonoid yang umumnya termasuk senyawa antioksidan alami dan memiliki fungsi antimikroba yaitu senyawa fenolik. Tujuan dari penelitian ini yaitu penentuan total fenol, meneliti aktivitas antioksidan, antibakteri, dan pada ekstrak etanol jantung pisang ambon (Musa acuminate Colla). Penentuan total fenol menggunakan metode GAE (Equivalensi Asam Galat), analisis antioksidan menggunakan metode FRAP, dan uji aktivitas antibakteri menggunakan metode kertas cakram. Hasil total fenol yang diperoleh 17,7291 ± 0,102 mg GAE/g ekstrak, hasil dari uji antioksidan didapat dengan nilai EC50 pada ekstrak 0,0628 µmolFe2+/g sampel yang berarti ekstrak etanol jantung pisang ambon mempunyai nilai aktivitas antioksidan yang tinggi, dan hasil antibakteri pada ekstrak dengan rata-rata sedang (5-10 mm). Dari hasil pengujian yang dilakukan ekstrak etanol jantung pisang ambon mempunyai aktivitas antioksidan dan mempunyai sedikit daya antibakteri. Kata kunci : Tanaman pisang; jantung pisang ambon; antioksidan; antibakteri; total fenol.

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