scholarly journals Phenolic Composition and Antioxidant Activity of Peel, Pulp and Seed Extracts of Different Clones of the Turkish Grape Cultivar ‘Karaerik’

Plants ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 2154
Author(s):  
Muhammed Kupe ◽  
Neva Karatas ◽  
Mehmet Settar Unal ◽  
Sezai Ercisli ◽  
Mojmir Baron ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Total Phenol ◽  
Trolox Equivalent Antioxidant Capacity ◽  
Total Phenolic ◽  
Total Phenol Content ◽  
Phenol Content ◽  
Grape Cultivar ◽  
Seed Extracts

The Erzincan plain is one of the richest regions in Turkey in terms of plant biodiversity. In this region, the famous grape cultivar ‘Karaerik’ has always dominated grape production due to its berry characteristics. The cultivar shows great morphological variation at clonal level. In this study, the total phenolic content and antioxidant activity of peel, pulp and seed extracts of nine ‘Karaerik’ clones sampled from same location were investigated. The Folin–Ciocalteu method was used to determine the total phenolic content of peel, pulp and seed extracts of nine clones. To determine antioxidant activity, three well known assays such as DPPH (2,2-diphenyl-1-picryl-hydrazyl-hydrate), FRAP (Ferric Reducing Antioxidant Power) and TEAC (Trolox Equivalent Antioxidant Capacity) were used. In addition, the correlation between total phenol content and DPPH, FRAP and TEAC was determined. Results showed that among the tissues, seed samples in berries of all clones had the highest total phenol content and antioxidant activity determined by three assays. Seed samples were followed by peel and pulp for total phenolic content and antioxidant activity. Among the nine ‘Karaerik’ clones, Clone 8 had the highest total phenolic content (149 mg GAE/100 g FW) while Clone 3 had the lowest (111 mg GAE/100 g FW). Peel, pulp and seed samples of nine ‘Karaerik’ clones showed strong antioxidant activity in DPPH, FRAP and TEAC assays. In particular, grape seeds were found rich for better in phenolic compounds including gallic acid, quercetin, catechin, chlorogenic acid, caffeic acid and p-coumaric acid. Clones such as 7, 8 and 9 higher antioxidant activity may present great potential for grape breeders and the food industry as well as health-conscious consumers.

Research on Food Manufacturing with Effect and Comparison of Microwave and Traditional Cooking Processing on Antioxidant Function of Lotus Root

2014 ◽  
Vol 1056 ◽  
pp. 92-97
Author(s):  
Yun Long Zhu ◽  
Ting Chen ◽  
Jing Jing Zhu ◽  
Yang Yuan
Keyword(s):  
Microwave Power ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Total Phenol ◽  
Water Volume ◽  
Total Phenolic ◽  
Total Phenol Content ◽  
Phenol Content ◽  
Cooking Method ◽  
Lotus Root

Purpose: In view of the lotus root has significant antioxidant properties but if improperly cooked easily destroyed, compared with traditional cooking method, and discusses the applicability of microwave processing and establish the optimum processing conditions. Method: By setting different microwave power and heating time, handling fresh-cut lotus root vacuum packaging products with microwave, measured flavonoids, total phenolic content and DPPH clearance, and synchronization researched the traditional cook methods cooking, steaming and stir-frying, comprehensive comparison the antioxidant effect of all kinds of processed products. Results: ①Under following conditions microwave power ≥60 P, processing time≤6min, flavonoids and total phenol content were high, DPPH clearance was bigger also. ②Cooking 6min,water volume between 500-1000mL, flavonoids and total phenol contents was high, but change with the further increased water volume, the contents decrease, DPPH clearance was relatively stable, when confirmed water volume 1500mL, cooking 2-4min, flavonoids content slightly ascending, then changed into degressive changes, the change of DPPH clearance was similar. Total phenol content was decrease progressively along with extending of the cooking time. ③Handing under steaming 15min, three index of the products were high voltage products > atmospheric products, the latter's steamed time should be less than 20 min. ④Making products in oil capacity 25mL or less 3 min, with the increase of oil capacity, flavonoids, total phenolic content and DPPH clearance were progressive increase. ⑤Lotus root food antioxidant activity: steamed food < cooked food < microwave food < fried food. Conclusion: In protecting lotus root antioxidant health care function in different cropping system, microwave is a kind of superior to boiling, steaming, and pressure cooking method and second only to oil fry.

scholarly journals Antioxidant activity and total phenolic content in Caulerpa filiformis (Chlorophyta) from Sechura Bay and Paracas Bay, Peru

2020 ◽  
Vol 27 (1) ◽  
pp. 061-066 ◽  
Author(s):  
Joyce Mamani ◽  
Jorge Chávez ◽  
Eder Apumayta ◽  
Patricia Gil-Kodaka
Keyword(s):  
Antioxidant Activity ◽  
Secondary Metabolites ◽  
Methanolic Extract ◽  
Total Phenol ◽  
North Coast ◽  
Total Phenolic ◽  
Total Phenol Content ◽  
Phytochemical Screening ◽  
Phenol Content ◽  
The North

In Peru, Caulerpa filiformis is a marine algae listed as an invasive species. For years, its distribution has been considered to be in the north coast (Isla Lobos de Afuera and Piura) until a recent report of its distribution in the central coast (Ancash, Lima, and Ica). The present investigation aims to determine the main groups of secondary metabolites, total phenol content, and antioxidant activity of the methanolic extract of C. filiformis from Sechura Bay (Piura) and Paracas Bay (Ica). The main chemical groups were determined through phytochemical screening, the content of phenols by the Folin–Ciocalteu method, and antioxidant activity by the ABTS method (2,2-azinobis-[3-ethylbenzothiazoline-6-sulfonic acid]) and 2,2′-diphenyl-1-picrylhydrazyl (DPPH). The phytochemical screening of the methanolic extract of C. filiformis from Sechura Bay and Paracas Bay revealed the presence of carbohydrates, polyphenols, tannins, flavonoids, lipids, alkaloids, steroids, and triterpenes for both extracts. The total phenol content of the extract of C. filiformis from Sechura Bay (39.31 ± 0.39 mg of AGE/g extract) was significantly higher (p < 0.05) than that from Paracas Bay (18.78 ± 0.31 mg of AGE/g extract). In the ABTS and DPPH assays, the antioxidant capacity of the Sechura C. filiformis extract (IC50 = 3.49 ± 0.01 and 2.18 ± 0.02 mg/mL) was significantly higher (p < 0.05) than that of the Paracas C. filiformis extract (IC50 = 6.41 ± 0.02 and 2.42 ± 0.04 mg /mL). These findings suggest that the methanolic extract of C. filiformis is a source of secondary metabolites with an antioxidant potential.

scholarly journals Evaluating the Effect of Gamma Radiation on the Total Phenolic Content, Flavonoids, and Antioxidant Activity of Dried Pleurotus ostreatus ((Jacq. ex. Fr) Kummer) Stored in Packaging Materials

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Nii Korley Kortei ◽  
George Tawia Odamtten ◽  
Mary Obodai ◽  
Victoria Appiah ◽  
Felicia Akuamoa ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Gamma Radiation ◽  
Pleurotus Ostreatus ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Total Phenolic ◽  
Total Phenol Content ◽  
Scavenging Activity

Dried Pleurotus ostreatus mushrooms stored in polythene and polypropylene packs were exposed to gamma radiation from a cobalt-60 source at doses of 0, 0.5, 1, 1.5, and 2 kGy at a dose rate of 1.7 kGy/hr and stored for a period of 1 month. Total phenolic contents, flavonoids, and free radical scavenging activity DPPH (2,2′-diphenyl-1-picrylhydrazyl) were determined using aqueous, ethanol, and methanol extracts by Folin-Ciocaultaeu method as a source of potential natural antioxidants. Total phenol content ranged 0.56 ± 0.01–10.96 ± 1.7 mg/GAE, flavonoids ranged 1.64 ± 0.05–8.92 ± 0.6 mg/QE, DPPH radical scavenging activity also ranged 7.02 ± 0.10–13.03 ± 0.04%, and IC50 values also ranged 0.08–0.16 mg/mL. Statistical differences (P < 0.05) were recorded for the extracts and the treatment doses of mushrooms stored in polythene and polypropylene packs. A significant linear correlation was confirmed between values for the total phenolic content and antioxidant activity of mushroom extracts. The high contents of phenolic compounds indicated that these compounds contribute to high antioxidant activity. Pleurotus ostreatus can be regarded as a promising candidate for natural mushroom sources of antioxidants with high value. The use of low dose gamma radiation by the local food industry could improve the hygienic quality, extend shelf-life, and preserve nutrients and antinutrients.

scholarly journals New Antioxidant Ingredients from Brewery By-Products for Cosmetic Formulations

Cosmetics ◽  
2021 ◽  
Vol 8 (4) ◽  
pp. 96
Author(s):  
Roberta Censi ◽  
Dolores Vargas Peregrina ◽  
Maria Rosa Gigliobianco ◽  
Giulio Lupidi ◽  
Cristina Angeloni ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Reducing Power ◽  
Total Phenol ◽  
Trolox Equivalent Antioxidant Capacity ◽  
Total Phenol Content ◽  
Hacat Cells ◽  
Phenol Content ◽  
Waste Products ◽  
Specific Product ◽  
Cosmetic Formulations

The purpose of this work was to evaluate the total phenol content and antioxidant activity of different types of handcrafted beers (Ego, Alter, Fiat Lux, Triplo Malto, Ubi, and Maior), as well as the starting materials (malts, hops, and yeast), the intermediate products, and the waste products (spent malts, hops, and yeast), in view of their use in innovative cosmetic formulations. Extractions from starting and spent samples were taken from water or 70° alcohol. The total phenol content (Folin Ciocalteau Essay) of all the brewing products depended on the specific product under investigation. The highest values were found in starting hops (ranging from approximately 93 to 155 mg GAE/g, according to the extraction solvent), intermediate ones in starting malt and starting yeast, and the lowest values in wort. The total phenol content in the final beers originates from the phenols that were extracted from the different ingredients, namely the starting malts, hops and yeast, but non-negligible values were still observed in spent products. The method used for the evaluation of the antioxidant activity, trolox equivalent antioxidant capacity (DPPH), ferric-ion reducing antioxidant parameter (FRAP), and radical cation scavenging activity and reducing power (ABTS) strongly influenced the results. In general, the results reflected the trend observed for the total phenol content: that beers are progressively enriched by phenols originating from all the starting ingredients, and that spent products still possess non-negligible antioxidant activity. It is interesting to note that waste yeast frequently showed higher values than those of the starting material; it can be inferred that yeast is able to absorb phenols from the beer during brewing. By considering the interest in exploiting waste derived from processing foods, the biological activity of waste Alter brewery products has been evaluated on a cell culture of keratinocytes (spent products of malt, hop, and yeast). Preliminary in vitro assays in keratinocyte HaCaT cells were carried out to assess the potential bioactivity of spent extracts. Among the spent extracts, the spent hop and yeast extracts showed the ability to improve the mitochondrial activity and prevent oxidative stress in HaCaT cells, two features in skin ageing. In conclusion, this study offers evidence that waste from handcrafted beers can be an interesting source of phenols for the preparation of skin anti-aging cosmetics.

scholarly journals Glucosinolate profiles by HPLC-DAD, phenolic compositions and antioxidant activity of Eruca vesicaria longirostris: Impact of plant part and origin

2016 ◽  
Vol 5 (5) ◽  
pp. 528-539
Author(s):  
Saoussen Bouacida ◽  
Hayet Ben Haj koubaier ◽  
Ahmed Snoussi ◽  
Marie Laure Fauconnier ◽  
Nabiha Bouzouita
Keyword(s):  
Antioxidant Activity ◽  
Statistical Analysis ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Plant Part ◽  
The Other ◽  
Total Phenolic ◽  
Total Flavonoids ◽  
Total Flavonoids Content ◽  
Seed Extracts

The glucosinolate profiles, phenol and flavonoid contents and the antioxidant activity of Eruca vesicaria longirostris were studied for different organs and origins. Eleven desulpho-glucosinolates (DS-GLSs) were isolated and quantified by lipid chromatography- DAD. Similarity between profiles was obtained. Total DS-GLS content, expressed as sinigrin equivalents (SE) revealed a certain variabilily ranging between (76.07-45.61), (27.01-13.53), (4.52 -18.01), (9.39-3.37) and (1.16-13.99) µmol /g DW for seeds, flowers, leaves, roots and stems, respectively. Results showed that seeds are rich in phenolics as they contain highest amounts of phenolics ranging from 27.6±0.5 to 33.47±0.5 mg GAE/g extract as compared to all other parts. Leaves and flowers had a significantly higher total phenolic content than stems and roots in all samples (p < 0.05). According to statistical analysis, the investigated seed extracts with values between (16.20±0.10-18.50±0.10 mg QE/g) exhibited the highest total flavonoids content, followed by leaves (13.00±0.40-15.80±0.30mg QE/g), flowers (10.40±0.40-12.90±0.90 mg QE/g) and stems (7.80±0.20- 9.80±0.70 mg QE/g). Antioxidant activity tested by DPPH, ABTS and FRAP assays, was higher for seeds, leaves and flowers than the other studied organs. These organs were characterized by a significantly high content in glucoerucin, nasturtin and epiprogroitrin, respectively.

scholarly journals Total Phenolic Content and Antioxidative Properties of Commercial Tinctures Obtained from Some Lamiaceae Plants

2012 ◽  
Vol 7 (12) ◽  
pp. 1934578X1200701 ◽  
Author(s):  
Adam Kowalczyk ◽  
Izabela Biskup ◽  
Izabela Fecka
Keyword(s):  
Antioxidant Activity ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Mentha Piperita ◽  
Trolox Equivalent Antioxidant Capacity ◽  
Total Phenolic ◽  
Abts Assay ◽  
Dpph Method

The antioxidant level of commercial tinctures from three Lamiaceae plants, Salvia officinalis, Mentha piperita, and Melissa officinalis, have been determined by the Folin-Ciocalteu method, the 2.2-diphenyl-2-picrylhydracyl hydrate (DPPH) radical scavenging technique and ABTS assay. Total phenolic content was expressed as GAE (gallic acid equivalent) and ranged from 0.24 to 3.99 mg/mL. Antioxidant activity in the ABTS assay, calculated as TEAC (Trolox equivalent antioxidant capacity), ranged from 23.5 to 35.6 μmol Trolox/mL, while in the DPPH method, the EC50 value ranged from 0.04 to 0.07 mL/assay. Radical scavenging activity was correlated with total phenolic content. Correlations between ABTS and F-C methods, DPPH and F-C methods and ABTS and DPPH methods were calculated. The obtained results can be useful as additional information about the antioxidant activity of galenical preparations.

Phenolic Compounds and Antioxidant Activity of Olea europaea L. Fruits and Leaves

2006 ◽  
Vol 12 (5) ◽  
pp. 385-395 ◽  
Author(s):  
S. Silva ◽  
L. Gomes ◽  
F. Leitão ◽  
A. V. Coelho ◽  
L. Vilas Boas
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Olive Tree ◽  
Total Phenolic ◽  
Total Antioxidant Activity ◽  
Total Antioxidant ◽  
Olive Seeds ◽  
Seed Extracts

Extracts of leaves, fruits and seeds of olive tree cultivars of Trás-os-Montes e Alto Douro (Portugal) were analysed by reverse phase HPLC with diode array detection and mass spectrometry (MS). This methodology allowed the identification of some common phenolic compounds, namely, verbascoside, rutin, luteolin-7-glucoside, oleuropein and hydroxytyrosol. Moreover the hyphenation of HPLC with MS enabled the identification of nüzhenide in olive seeds. An oleuropein glucoside was also detected in olive tree leaves. The total phenolic content was determined with the Folin Denis reagent and the total antioxidant activity with the ABTS method. There is a correlation between total antioxidant activity and total phenolic content with the exception of the seed extracts analysed. The apparent high antioxidant activity of seed extracts may be due to nüzhenide, a secoiridoid that is the major phenolic component of olive seeds. These results suggest a possible application of olive seeds as sources of natural antioxidants.

scholarly journals ANALISIS TOTAL FENOLIK DAUN GEDI HIJAU (Abelmoschus manihot L.) DENGAN MENGGUNAKAN SPEKTROSKOPI FTIR DAN KEMOMETRIK

PHARMACON ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 758
Author(s):  
Jhon D. Rumoroy ◽  
Sri Sudewi ◽  
Jainer P. Siampa
Keyword(s):  
Standard Error ◽  
Phenolic Content ◽  
Total Phenol ◽  
Total Phenolic ◽  
Total Phenol Content ◽  
Phenol Content ◽  
Leaf Extracts ◽  
Natural Substances ◽  
Measurement Results ◽  
Error Calibration

ABSTRACTNatural phenolic compounds, including organic compounds, is the natural substances that produced by organisms. This study aims to determine the total phenol content and optimization using the FTIR method for rapid phenols analysis. Gallic acid was used as a comparison standard to measure the total phenol content using a UV-Vis spectrophotometer. The calorimetric method was used to determine the total Phenolic content of the Green Gedi Leaf extracts in 8 samples of growing sites, namely Minahasa 855.8 µg GEA / g extract ± 0.033, Southeast Minahasa 283.7 µg GEA / g extract ± 0.006, Manado 580.2 µg GEA / g extract ± 0.012, North Minahasa 716.2 µg GEA / g extract ± 0.091, Kotamobagu 793 µg GEA / g extract ± 0.03, Minahasa Selatan 290.6 µg GEA / g extract ± 0.027, Bitung 365.6 µg GEA / g extract ± 0.035, Tomohon as much as 546.5 µg GEA / g extract ± 0.003. This result involves a combination of variables x (FTIR measurement results) and y variables (data from the analysis of Folin-Ciocalteu). Error value (standard error calibration (SEC = 0.003), standard error of prediction (SEP = 0.042)) and calibration r value 0.999 and r validation 0.98. Keywords: Green Gedi Leaves, UV-Vis Spectrophotometer, Kemometrics, Phenol Total, FTIR Spectrophotometry.ABSTRAK Senyawa fenolik alam termasuk senyawa organik bahan alam yang dihasilkan oleh organisme. Penelitian ini bertujuan untuk mengetahui kandungan fenol total Daun Gedi Hijau dan optimasi menggunakan metode FTIR untuk analisis fenolsecara cepat. Asam  galat digunakan standar pembanding dalam mengukur kandungan total fenol menggunakan spektrofotometer UV-Vis. Metode kemometrik digunakan untuk mengetahui kandungan Total Fenolik pada ekstrak Daun Gedi Hijau pada 8 sampel tempat tumbuh yaitu Minahasa 855,8 µg GEA/g  ekstrak ± 0,033, Minahasa Tenggara 283,7 µg GEA/g  ektrak ± 0,006, Manado 580,2 µg GEA/g  ekstrak ± 0,012, Minahasa Utara 716,2 µg GEA/g  ekstrak ± 0,091, Kotamobagu 793 µg GEA/g  ekstrak ± 0,03, Minahasa Selatan 290,6 µg GEA/g  ekstrak ± 0,027, Bitung 365,6 µg GEA/g  ekstrak ± 0.035, Tomohon sebesar 546,5 µg GEA/g  ekstrak ± 0,003. Hasil ini melibatkan kombinasi variable x (hasil pengukuran FTIR) dan variable y (data hasil analisis Folin-Ciocalteu). Nilai kesalahan (standard error calibration (SEC = 0.003), standard error of prediction (SEP = 0.042)) dan nilai r kalibrasi 0,999 serta  r validasi 0,98. Kata Kunci: Daun Gedi Hijau, Spektrofotometer UV-Vis, Kemometrik, Total Fenol, Spektrofotometri FTIR.

scholarly journals Evaluation of total phenolic content, antioxidant activity, germination power, and yield of pigeon pea (Cajanus cajan) sprouts elicited using various Naalginate levels with different elicitation duration

Food Research ◽  
2021 ◽  
Vol 5 (S2) ◽  
pp. 91-97
Author(s):  
S. Ariviani ◽  
K.C. Hapsari ◽  
G. Fauza ◽  
D. Ishartani ◽  
W. Atmaka ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Capacity ◽  
Total Phenolic Content ◽  
Cajanus Cajan ◽  
Phenolic Content ◽  
Pigeon Pea ◽  
Trolox Equivalent Antioxidant Capacity ◽  
Total Phenolic ◽  
Antioxidant Power ◽  
Trolox Equivalent

This study was aimed to investigate the total phenolic content and antioxidant activity of elicited pigeon pea (Cajanus cajan) sprouts prepared using various Na-alginate concentrations at different elicitation durations. The germination power and yield of the sprouts were also examined. Elicitation proved capable to improve the antioxidant capacity of legumes sprouts but the yield and germination rates were decreased due to the elicitation stress. In this study, elicitation conducted by immersing pigeon pea seeds in Na -alginate solutions (250, 300, and 350 ppm) for various duration (16, 20, and 24 hrs). The seeds were then germinated for 48 hrs to produce Na-alginate elicited pigeon pea sprouts. The results showed that the total phenolic content (TPC) and antioxidant activity (Trolox equivalent antioxidant capacity, TEAC, and Ferric reducing antioxidant power, FRAP) of elicited pigeon pea sprouts were significantly increased along with the increasing elicitation duration in all Na-alginate levels. The higher Na-alginate levels produce a higher level of TPC, TEAC, and FRAP values. On the other hand, germination power and the yield of the sprouts were significantly decreased along with increasing Na-alginate levels and elicitation duration. Elicitation using 350 ppm Na-alginate with an elicitation duration of 24 hrs produces elicited pigeon pea sprouts with the highest TPC and antioxidant activity, but lowest germination power and yield. These results have an important consequence in developing an elicitation technique to improve the antioxidant capacity of leguminous.

scholarly journals Evaluasi Potensi Antioksidan Oleoresin Daun Kari dalam Emulsi Minyak Nabati setelah Pemanasan

2016 ◽  
Vol 1 (1) ◽  
pp. 947-953
Author(s):  
Darmawati Darmawati ◽  
Novi Safriani ◽  
Novia Mehra Erfiza
Keyword(s):  
Phenolic Content ◽  
Corn Oil ◽  
Heating Temperature ◽  
Heating Time ◽  
Total Phenol ◽  
Total Phenolic ◽  
Total Phenol Content ◽  
Phenol Content ◽  
Oil Emulsion ◽  
Curry Leaves

Abstrak. Oleoresin daun kari mengandung senyawa polifenol yang berpotensi sebagai antioksidan. Tujuan penelitian ini untuk mengetahui pengaruh suhu dan lamanya pemanasan terhadap kandungan total fenol oleoresin daun kari di dalam emulsi minyak jagung dan stabilitas minyak jagung terhadap pemanasan yang dilihat dari spektra FTIR. Rancangan penelitian yang digunakan pada penelitian adalah Rancangan Acak Lengkap (RAL) faktorial, terdiri dari dua faktor, yaitu suhu pemanasan (T) dan lama pemanasan (W). Suhu pemanasan (T) terdiri dari 3 taraf, yaitu: T1=120oC, T2=150oC, T3=180oC. Lama pemanasan (W) terdiri dari 4 taraf yaitu: W1=15 menit, W2=30 menit, W3=45 menit dan W4=60 menit. Perlakuan diulang 3 kali. Parameter yang dianalisis yaitu kandungan total fenol dan identifikasi gugus fungsi dengan metode FTIR. Hasil penelitian menunjukkan bahwa suhu pemanasan dan lama pemanasan berpengaruh sangat nyata (P ≤ 0,01) terhadap kandungan total fenol oleoresin daun kari dalam emulsi minyak jagung. Semakin tinggi suhu pemanasan, kandungan total fenol semakin menurun yaitu dari 120oC ke 180oC, nilai total fenol menurun dari 0,157 menjadi 0,124 mg GAE/ml sampel. Semakin lama pemanasan, kandungan total fenol semakin menurun yaitu dari 15 menit ke 60 menit, nilai total fenol menurun dari 0,171 menjadi 0,112 mgGAE/ml sampel. Penambahan oleoresin daun kari dalam emulsi minyak jagung dapat mempengaruhi laju oksidasi asam lemak tidak jenuh, terlihat dari puncak pada panjang gelombang 3007 cm-1 yang mempunyai intensitas berbeda. Abstract. Curry leaves oleoresin contains polyphenol compounds as an antioxidant. The purpose of this study was to determine the effect of heating temperature and time on the total phenolic content of curry leaves oleoresin in the corn oil emulsion and the stability of corn oil after heating that could be seen from FTIR spectra. The research was conducted using a Completely Randomized Design (CRD) consisted of two factors. The first factor was heating temperature (T1=120oC, T2=150oC, T3=180oC). The second factor was heating time (W1=15 minutes, W2=30 minutes, W3=45 minutes and W4=60 minutes). The treatment was repeated 3 times. The analyzed parameters were total phenol content and identification of organic compounds with the FTIR. The results showed that the heating temperature and time had significant effects (P ≤ 0.01) on the total phenolic content of curry leaves oleoresin in corn oil emulsion. As the heating temperature increased, the total phenol content decreased. From 120oC to 180oC, the total phenols decreased from 0.157 to 0.124 mgGAE / ml sample. As heating time increased, the total phenol content decreased. From 15 minutes to 60 minutes, the total phenol decreased from 0.171 to 0.112 mgGAE/ml sample. The addition of curry leaves oleoresin in corn oil emulsion affected the rate of unsaturated fatty acids oxidation. It can be seen from the peak at a wavelength of 3007 cm-1 which had a different intensity.

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