Effects of different drying methods on the antioxidant properties of leaves and tea of ginger species

Chan, Eric Wei Chiang; Lim, Yau Yan; Wong, Siu Kuin; Lim, K.K.; Tan, Shiau Pin; Lianto, F.S.; Yong, Man-Jung

doi:10.1016/j.foodchem.2008.07.090

Cited by 421 publications

(367 citation statements)

References 29 publications

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“…These results significantly demonstrate that blanching induced the decrease in TPC because of the high temperature employed. The TPCs obtained in this investigation were higher than those obtained by Chan et al (2009), where a value of 187 mg µg GAE/mL was obtained in leaves and rhizomes of different ginger species.…”

Section: Without Blanchingcontrasting

confidence: 79%

Effect of osmotic dehydration on the physical and chemical properties of Mexican ginger (Zingiber officinalevar. Grand Cayman)

García-Toledo

Ruiz-López

Martínez‐Sánchez

et al. 2015

CyTA - Journal of Food

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The aim of this study was to evaluate the effect of osmotic dehydration of ginger on the properties of color, total polyphenol content (TPC) and antioxidant capacity (AC). Fresh samples were pretreated with scalding (100°C/1.0 minute). Water loss (WL) and solid gain (SG) kinetics were performed using three sucrose concentrations: 35%, 50% and 65% at three temperatures: 40°C, 55°C and 70°C. WL and SG simulated kinetics by Diffusion model for cubes averaged a R 2 of 0.95. The diffusivities for water and solid by Fick's Law obtained maximum values of 6.81 × 10 −7 and 2.65 × 10 −7 m 2 /s, respectively. WL results were obtained up to 60.83% and SG 32.24%. Ginger treatments without blanching (GWB) at 40°C with 35% and 50% sucrose, respectively, showed a similar fresh ginger color. The GWB treatments showed the higher TPC using 50% sucrose at 40°C (753 μg GAE/mL) and AC (341.96 mg AAE/mL).Keywords: osmotic dehydration; total polyphenol content; water loss; Zingiber officinale var. Grand Cayman El objetivo de este estudio fue evaluar el efecto de la deshidratación osmótica de jengibre sobre las propiedades del color, contenido de polifenoles totales (CPT) y la capacidad antioxidante (CA). Las muestras frescas fueron pretratadas con escaldado (100°C/1.0 minuto). Las cinéticas de pérdida de agua (PA) y ganancia de solidos (GS) se realizaron con tres concentraciones de sacarosa: 35, 50 y 65% a tres temperaturas: 40, 55 y 70°C. Las cinéticas de PA y GS simuladas por el modelo de Difusión para cubos promediaron una R 2 de 0,95. Los difusividades de agua y sólidos calculadas por la Ley de Fick obtuvieron valores máximos de 6,81 × 10 −7 y 2,65 × 10 −7 m 2 /s, respectivamente. Los resultados de PA obtuvieron hasta un 60,83% y la GS hasta un 32,24%. Los tratamientos de jengibre sin escaldar (GSE) a 40°C con 35 y 50% de sacarosa respectivamente, mostraron un color similar al jengibre fresco. Los tratamientos GSE mostraron el mayor CPT utilizando 50% de sacarosa a 40°C (753 mg EAG/mL) y CA (341,96 mg EAA/mL).Palabras clave: deshidratación osmótica; contenido de polifenoles totales; pérdida de agua; Zingiber officinale var. Gran Caimán

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Section: Without Blanchingcontrasting

confidence: 79%

Effect of osmotic dehydration on the physical and chemical properties of Mexican ginger (Zingiber officinalevar. Grand Cayman)

García-Toledo

Ruiz-López

Martínez‐Sánchez

et al. 2015

CyTA - Journal of Food

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“…The GC-MS characterization of SBEAB showed four predominant PUFAs namely; 1,2-epoxycyclooctane, trans-2-nonenal, 1-(2-hydroxyl-1-nitroethyl) cyclohexanol and Spiro [1,3-dioxolane-2,2'-6 (6,7] diazobicyclo [3.2.2 non-6-ene. These have been reported as anti-microbial agent [22], antioxidant and anti-inflammatory mediator [18], anticancer agent, and strong inhibitor of cyclooxygenase-2 (COX-2) [23], while all other compounds were recognized and acted as prophylactics of reacting oxygen species (ROS) [20]. This is in support of previous studies which reported phytochemicals as chemoprevention of diverse diseases and ailments [13].…”

Section: Discussionsupporting

confidence: 74%

“…Herbs have also been recognized to possess medicinal properties [19]. The herbal therapies with high phenolic content are preponderant in the West Africa especially the tropical Africa [20,21]. They are administered with a drink to treat colds and several assaults [18,20].…”

Section: Introductionmentioning

confidence: 99%

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PUFAs from Stem Bark of Alstonia boonei Synergistically Modulates Diabetic, Hepatic and Androgenic Damage by Low Expression of COX-2 and iNOS in Rats

Ajiboye¹,

Akintunde²,

So³

et al. 2017

J Mol Biomark Diagn

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PUFAs, from the stem bark extract of Alstonia boonei (SBEAB) was hypothesized to possess anti-inflammatory, antioxidant, anti-diabetic, pro-spermatogenic and hepatoprotective activities. The present study investigated the possible biochemical and molecular mechanisms underlying the hepatoprotective and testoprotective effects of SBEAB in diabetic rat. Biomarkers of hepatic and testicular damage, histological and immunohistochemical techniques were used. The expression of cyclooxygenase (COX-2) and inducible nitric oxide synthase (iNOS) were also estimated. SBEAB administered orally at dose of 100 mg/kg for 14 days significantly lowered the activities of serum transaminases and MDA levels induced by single intraperitoneal administration of streptozotoxin (STREP) (80 mg/kg) and preserved the integrity of both hepatocytes and spermatocytes. Also, SBEAB elevated the STREPinduced reduced activities of Δ5-17β-HSD and Δ5-17β-HSD with corresponding decrease in the activity of CAT. SBEAB inhibited the STREP induced expression of COX-2 and iNOS. The protective effect of SBEAB was compared to that of metaglomide (METAG), an established anti-diabetic drug. METAG treatment on hepatic damage was most efficacious in diabetic rats; followed by post and pre-treatment respectively while pre-and post-treatment were more efficacious on testicular damage than anti-diabetic drug. Furthermore, pre and post-treatment were more efficacious in preventing pro-inflammation and testicular cancer in diabetic rats than METAG-administration. We therefore concluded that the repression of genes encoding COX-2 and iNOS proteins by SBEAB validates the molecular basis of testicular protection and further suggests the links between the hepatocellular damage and male reproductive dysfunctions in diabetic individuals.

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“…Though the phenolic compounds are thermally stable upto a certain rise in level of temperature, the antioxidant activity has been found to decline with rise in temperature above 40°C. This may be due to thermal degradation of other antioxidant compounds than polyphenols present in the sample (Chan et al, 2009). Taking into consideration the nutraceutical benefits of antioxidant, 40°C has been chosen as the optimised temperature for antioxidant recovery from the sample.…”

Section: Effect Of Extraction Temperaturementioning

confidence: 99%

Classical Single Factor Optimisation of Parameters for Phenolic Antioxidant Extraction from Tamarind Seed (Tamarindus indica)

Sarkar

Ghosh

2016

Plant Sci. Today

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Presently the work deals with outreaching and exhaustive investigations involving single factor optimisation method, to optimise the parameters for phenolic antioxidant extraction from the seeds of Tamarindus indica. At first the characterization of the seeds has been performed by estimating the total calorie value, carbohydrate, protein, fat, Total Polyphenol Content (TPC), moisture (%), total ash (%), total solid (%), volatile solid (%), fixed carbon (%), bulk density (%), pH and solubility. The effects of solid to solvent ratio (1:10 -1:30 w/v), ethanol concentration (25 -100% v/v), extraction time (1 -24 hours) and extraction temperature (25 -60°C) have been investigated to optimise the extraction of Total Polyphenol Content (TPC) and Antioxidant capacity determined by Folin -Ciocalteu and FRAP analyses respectively. The solvent extraction conditions have been optimised at solid to solvent ratio of 1:20 w/v, 50% ethanol as solvent and 3 hours of shaking at 40°C.

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Effects of different drying methods on the antioxidant properties of leaves and tea of ginger species

Cited by 421 publications

References 29 publications

Effect of osmotic dehydration on the physical and chemical properties of Mexican ginger (Zingiber officinalevar. Grand Cayman)

Effect of osmotic dehydration on the physical and chemical properties of Mexican ginger (Zingiber officinalevar. Grand Cayman)

PUFAs from Stem Bark of Alstonia boonei Synergistically Modulates Diabetic, Hepatic and Androgenic Damage by Low Expression of COX-2 and iNOS in Rats

Classical Single Factor Optimisation of Parameters for Phenolic Antioxidant Extraction from Tamarind Seed (Tamarindus indica)

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