scholarly journals STABILITAS ANTOSIANIN JANTUNG PISANG KEPOK (Musa paradisiaca L) TERHADAP CAHAYA SEBAGAI PEWARNA AGAR-AGAR

2015 ◽  
Vol 34 (04) ◽  
pp. 374 ◽  
Author(s):  
Lydia Ninan Lestario ◽  
Matius Kristiarso Wibowo Catur Yoga ◽  
Augustinus Ignatius Kristijanto
Keyword(s):  
Citric Acid ◽  
Light Intensity ◽  
Tartaric Acid ◽  
Degradation Rate ◽  
Differential Method ◽  
Anthocyanin Content ◽  
K Value ◽  
Musa Paradisiaca ◽  
Color Degradation

The objectives of this study were to determine the solution that could extract highest anthocyanin from banana bract, to determine the concentration of banana bract extract in jelly which preferred best by panelists, to determine color degradation rate in jelly colored with banana bract against light on various light intensity, and to determine the maximum light intensity which could be accepted by the panelists based on the hedonic test. Anthocyanin of banana bract was extracted by tartaric acid, citric acid, and acetate acid. Anthocyanin content of banana bract was measured by pH differential method. For the hedonic test, jelly with concentration of banana bract 15%, 20%, 25%, 30%, 40% and 50%, were used with 20 panelists. Then jelly with 25% concentration of banana bract was used for determination of color degradation rate caused by light with the intensity of 780, 1,850, 2,214 dan 10,340 lux. The results showed thatthe best solution that extracted highest anthocyanin was tartaric acid, the concentration of banana bract extract in jelly that preferred best by panelists was 25%, the color degradation rate was increased along with the increasing of light intensity, with the k value 0.0042 – 0.0096 AU/hour. After 10 hours under light with intensity of 780-2,214 lux, the jelly colored with 25 % of banana bract extract was still could be accepted by panelists, whereas under light intensity of 10,340 lux could not be accepted by panelists.Keywords: Anthocyanin, banana bract, jelly, light intensity, color degradation rate ABSTRAKTujuan dari penelitian ini adalah untuk menentukan larutan pengekstrak jantung pisang kepok yang menghasilkan antosianin tertinggi, menentukan konsentrasi ekstrak jantung pisang kepok dalam agar-agar yang paling disukai panelis, menentukan laju degradasi warna agar-agar dengan pewarna jantung pisang kepok akibat penyinaran pada berbagaiintensitas cahaya, dan menentukan intensitas cahaya maksimum yang masih dapat diterima oleh panelis berdasarkan uji hedonik setelah penyinaran. Antosianin jantung pisang kepok diekstraksi menggunakan pelarut asam tartarat, asam sitrat, dan asam asetat. Kadar antosianin diukur dengan metode perbedaan pH. Untuk uji hedonik digunakan agar-agar dengan kadar ekstrak jantung pisang kepok 15%, 20%, 25%, 30%, 40% dan 50 %. Uji stabilitas warna dilakukan terhadap agar-agar dengan pewarna jantung pisang kepok 25%, dan disinari selama 10 jam dengan intensitas cahaya 780, 1.850, 2.214, dan 10.340 lux. Hasil penelitian menunjukkan bahwa larutan pengekstrak yang menghasilkanantosianin tertinggi adalah asam tartarat. Konsentrasi ekstrak jantung pisang kepok dalam agar-agar yang paling disukai panelis adalah 25 %. Laju degradasi warna agar-agar dengan pewarna jantung pisang kepok meningkat seiring dengan meningkatnya intensitas cahaya, dengan nilai k berkisar antara 0,0042 - 0,0096 AU/Jam. Agar-agar dengan pewarnajantung pisang kepok yang disinari dengan intensitas 780-2.214 lux selama 10 jam masih disukai panelis, sedangkan yang disinari dengan intensitas 10.340 sudah tidak disukai panelis.Kata kunci: Antosianin, jantung pisang, agar-agar, intensitas cahaya, laju degradasi warna

Determination of Tartaric Acid and the Sum of Malic and Citric Acids in Grape Juices by Potentiometric Titration

1988 ◽  
Vol 71 (5) ◽  
pp. 1028-1032
Author(s):  
Oswaldo E S Godinho ◽  
Nilson E Desouza ◽  
Luiz M Aleixo ◽  
Ari U Ivaska
Keyword(s):  
Citric Acid ◽  
Tartaric Acid ◽  
Potentiometric Titration ◽  
Malic Acid ◽  
Grape Juice ◽  
Algebraic Method ◽  
The Individual ◽  
Grape Juices ◽  
Linear Algebraic Method

Abstract Application of a linear algebraic method to the potentiometric titration of a mixture of tartaric and malic acids makes it possible to determine the individual concentrations of both acids in the same sample. These 2 acids have also been determined in grape juice free of citric acid after their separation from the juice matrix by precipitation as barium salts, followed by selective solubilization. It is also possible to determine tartaric acid and the sum of malic acid and citric acid in grape juice when the latter is present.

scholarly journals PENGARUH INTENSITAS CAHAYA TERHADAP DEGRADASI WARNA AGARAGAR YANG DIWARNAI SARI UMBI BIT MERAH (Beta vulgaris L. var. rubra L.)

Agric ◽  
2016 ◽  
Vol 25 (1) ◽  
pp. 42
Author(s):  
Lydia Ninan Lestario ◽  
Noviana Gunawan ◽  
Yohanes Martono
Keyword(s):  
Light Intensity ◽  
Beta Vulgaris ◽  
Rate Constant ◽  
Degradation Rate ◽  
Color Stability ◽  
Fluorescent Light ◽  
Beetroot Juice ◽  
Constant Rate ◽  
Degradation Rate Constant ◽  
Color Degradation

<p>The aims of this research were to determine the concentration of beetroot juice in jelly which panelists like best; to determine the color degradation rate constant in jelly colored with beetroot juice caused by sunlight and fluorescent light; and color degradation rate constant of jelly colored with synthetic colorant.</p><p>The organoleptic test used 2,5 percent; 5 percent; 7,5 percent; 10 percent; and 12,5 percent beetroot juice and permitted synthetic colorant for food. The light intensity to test the beetroot color stability in jelly were 879,06 lux, 1.688,54 lux, 2.342,2 lux and 6.752,2 lux.</p><p>The results showed that the concentration of beetroot juice which panelists like best was 5 percent.; The color degradation rate constant of jelly colored by 5 percent beetroot juice on intensity 879,06 lux was 0,0468 hour-1; 1.688,54 lux was 0,0565 hour-1; 2.342,2 lux was 0,0653 hour-1;<br />6.752,2 lux was 0,0887 hour-1. The higher the light intensity, the higher the degradation constant rate.</p>

scholarly journals Separation and Determination of Some Organic Acids in Dry Calyces of Iraqi Hibiscus Sabdariffa Linn

2015 ◽  
Vol 12 (2) ◽  
pp. 340-349
Author(s):  
Baghdad Science Journal
Keyword(s):  
Acetic Acid ◽  
Citric Acid ◽  
Oxalic Acid ◽  
Organic Acids ◽  
Formic Acid ◽  
Succinic Acid ◽  
Tartaric Acid ◽  
Malic Acid ◽  
Limit Of Detection

A new reversed phase- high performance liquid chromatographic (RP-HPLC) method with Ultraviolet-Visible spectrophotometry has been optimized and validated for the simultaneous extraction and determination of organic acids present in Iraqi calyces of Hibiscus Sabdraffia Linn. The method is based on using ultrasonic bath for extracting organic acids. Limit of detection in µg/ml of Formic acid, Acetic acid, Oxalic acid, Citric acid, Succinic acid, Tartaric acid, and Malic acid 126.8498×10-6, 113.6005×10-6, 97.0513×10-6, 49.7925×10-6, 84.0753×10-6, 92.6551×10-6, and 106.1633×10-6 ,respectively. The concentration of organic acids found in dry spacemen of calyces of Iraqi Hibiscus Sabdraffia Linn. under study: Formic acid, Acetic acid, Oxalic acid, Citric acid, Succinic acid, Tartaric acid, and Malic acid are 114.896 µg/g, 64.722 µg/g, 342.508 µg/g, 126.902 µg/g, 449.91 µg/g, 268.52 µg/g, and 254.07 µg/g respectively.

scholarly journals Use of tartaric acid–citric acid–sucrose as chemical modifier for the determination of lead in several matrices employing ET AAS

2016 ◽  
Vol 126 ◽  
pp. 368-372 ◽  
Author(s):  
Ariana M.S. Lima ◽  
Dominique G.G.R. Araújo ◽  
Sérgio L.C. Ferreira
Keyword(s):  
Citric Acid ◽  
Tartaric Acid ◽  
Chemical Modifier

scholarly journals Near-Infrared Spectroscopy as a Rapid Screening Method for the Determination of Total Anthocyanin Content in Sambucus Fructus

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4983
Author(s):  
Stefan Stuppner ◽  
Sophia Mayr ◽  
Anel Beganovic ◽  
Krzysztof Beć ◽  
Justyna Grabska ◽  
...  
Keyword(s):  
Sample Preparation ◽  
Near Infrared ◽  
Screening Method ◽  
Differential Method ◽  
Anthocyanin Content ◽  
Cyanogenic Glycosides ◽  
Total Anthocyanin ◽  
Total Anthocyanin Content ◽  
Tof Ms

Elderberry (Sambucus nigra L., fructus) is a very potent herbal drug, deriving from traditional European medicine (TEM). Ripe elderberries are rich in anthocyanins, flavonols, flavonol esters, flavonol glycosides, lectins, essential oils, unsaturated fatty acids and vitamins. Nevertheless, unripe elderflower fruits contain a certain amount of sambunigrin, a toxic cyanogenic glycoside, whose concentration decreases in the ripening process. Therefore, quality assurance must be carried out. The standard method described in literature is the photometric determination (pH-differential method) of the total anthocyanin content (TAC) that is the highest when the berries are ripe. The drawback of the pH-differential method is the extensive sample preparation and the low accuracy of the method. Therefore, the goal of this publication was to develop a fast non invasive near-infrared (NIR) method for the determination of TAC in whole berries. TAC of elderberries was measured using pH-differentiation method where TAC values of 632.87 mg/kg to 4342.01 mg/kg were measured. Additionally, cyanidin-3-O-glucoside, cyanidin-3-O-sambubioside and cyanidin-3-O-sambubioside-5-O-glucoside which represent more than 98% of TAC in elderberry were quantified using ultra high performance liquid chromatography-multiple wavelength detection—ultra high resolution-quadrupole-time of flight-mass spectrometry (UHPLC-MWD-UHR-Q-TOF-MS) and their sum parameter was determined, ranging between 499.43 mg/kg and 8199.07 mg/kg. Using those two methods as reference, whole elderberries were investigated by NIR spectroscopy with the Büchi NIRFlex N-500 benchtop spectrometer. According to the constructed partial least squares regression (PLSR) models the performance was as follows: a relative standard deviation (RSDPLSR) of 13.5% and root mean square error of calibration (RMSECV/RMSEC) of 1.31 for pH-differentiation reference and a RSDPLSR of 12.9% and RMSECV/RMSEC of 1.28 for the HPLC reference method. In this study, we confirm that it is possible to perform a NIR screening for TAC in whole elderberries. Using quantum chemical calculations, we obtained detailed NIR band assignments of the analyzed compounds and interpreted the wavenumber regions established in PLSR models as meaningful for anthocyanin content. The NIR measurement turned out to be a fast and cost-efficient alternative for the determination of TAC compared to pH-differential method and UHPLC-MWD-UHR-Q-TOF-MS. Due to the benefit of no sample preparation and extraction the technology can be considered as sustainable green technology. With the above mentioned inversely proportional ratio of TAC to total amount of toxic cyanogenic glycosides, NIR proves to be a reliable screening method for the ideal harvest time with maximal content of TAC and lowest content of cyanogenic glycosides in elderberry.

Smartphone Digital Image Colorimetric Determination of the Total Monomeric Anthocyanin Content in Black Rice via the pH Differential Method

2021 ◽  
Author(s):  
Chonlada Bennett ◽  
Phumon Sookwong ◽  
Jaroon Jakmunee ◽  
Sugunya Mahatheeranont
Keyword(s):  
Mobile Phone ◽  
Digital Image ◽  
Differential Method ◽  
Anthocyanin Content ◽  
Colorimetric Determination ◽  
Black Rice ◽  
System P ◽  
First Time

In this research, the pH differential method was explored for the first time using a mobile phone as a detector, replacing UV-Vis spectrophotometry. A smartphone digital image colorimetric (SDIC) system...

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