Pratibha Singh

Bio: Pratibha Singh is an academic researcher from Deen Dayal Upadhyay Gorakhpur University. The author has contributed to research in topics: Essential oil & Oleoresin. The author has an hindex of 6, co-authored 8 publications receiving 602 citations.

Effect of volatile oil and oleoresin of anise on the shelf life of yogurt

Abstract: Yogurt (prepared from buffalo's milk) samples treated with anise volatile oil and its oleoresin (ethanol) at varying concentrations (01–10 g/L) were stored up to 20 days at 4 ± 1C The physicochemical and microbiological qualities of yogurt samples were analyzed at 5-day interval during storage A gradual increase in acidity and syneresis was observed, whereas a decline in pH and total solid contents was noted in all the samples The studies revealed that incorporation of essential oil and oleoresin of anise at 10 g/L concentration is quite effective in controlling the growth of spoilage microorganisms in yogurt The results also suggest that the addition of anise volatile oil and oleoresin has no adverse effect on the physicochemical properties of yogurt PRACTICAL APPLICATIONS Essential oils and oleoresins of anise can be used as food preservatives for yogurt

Chemical composition and antioxidant activities of essential oil and oleoresins from Curcuma zedoaria rhizomes, part-74

Abstract: The chemical composition of essential oil and oleoresins (ethanol, ethyl acetate andisopropanol) from rhizomes of Curcuma zedoaria was analyzed by the Gas Chromatography–Mass Spectroscopy technique. The antioxidant studies were carried out by peroxide andthiobarbituric acid values, ferric thiocyanate, 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicalscavenging, metal chelating and reducing power methods. Curzerenone (31.6%) was themajor component in the volatile oil, followed by germacrone (10.8%). In ethanol,isopropanol and ethyl acetate oleoresin, a total of 26, 25, and 40 components wereidentified respectively and the major ones are curzerenone, germacrone, camphor andcurcumenol. Essential oil, oleoresins (ethyl acetate and isopropanol) showed potentantioxidant activity in all the experiments. However, the activity of ethanol oleoresinwas found to be lower as compared to ethyl acetate and isopropanol oleoresin.& 2013 Elsevier Ltd. All rights reserved. 1. Introduction It has been established that oxidative stress is among themajor causative factors in the induction of many chronic anddegenerative diseases including atherosclerosis, heart dis-ease, cancer, ageing, diabetes mellitus and others (Young &Woodside, 2001). The most effective way to eliminate freeradicals which cause the oxidative stress is with the help ofantioxidants. Currently, there is a growing interest towardnatural antioxidants of herbal resources (Velioglu, Mazza,Gao, & Oomah, 1998). Epidemiological and in-vitro studies onspices, medicinal plants and vegetables strongly supportedthis idea that plant constituents with antioxidant activity ofexerting protective effects against oxidative stress in biologicalsystem. C. zedoaria (Berg.) rosc, (Zingiberaceae) has long beenused as folk medicine.Curcuma (Zingiberaceae) is a large genus of rhizomatousherbs distributed in tropical and subtropical regions especiallyin India, Thailand, Malay Archipelago, IndoChina, and North-ern Australia. Many phytochemical studies on the extracts andessential oils of several Curcuma species, especially C. longa,have identified curcuminoids and sesquiterpenoids as themajor components (Itokawa, Shi, Akiyama, Morris-Natschke,& Lee, 2008), and these compounds have been identified as themajor groups of antioxidants in the plants. The antioxidantactivity of Curcuma longa, has been measured by variouschemical methods such as DPPH radical scavenging activityassay, superoxide anion radical scavenging activity assay,

Chemistry and Antioxidant Properties of Essential Oil and Oleoresins Extracted from the Seeds of Tomer (Zanthoxylum armatum DC)

Abstract: The seeds of Zanthoxylum armatum DC, on hydrodistillation, yielded 1.2% of the essential oil. The oleoresins were extracted by a Soxhlet extractor using ethanol, ethyl acetate, and isopropyl alcohol. Gas chromatography-mass spectrometry analysis of the essential oil resulted in the identification of 38 components, of which linalool (62%) and limonene (18.1%) were the major components. The major components of oleoresins were linoleic acid, palmitoleic acid, and linalool. The antioxidant potential of essential oil and oleoresins were evaluated by 2,2′-diphenyl picrylhydrazyl radical scavenging, Fe2+ chelating, ferric thiocyanate method, and various lipid peroxidation assays. The essential oil showed maximum antioxidant potential, whereas oleoresins showed moderate antioxidant activity. *This article is part 73 in a series on essential oils.

Food applications of natural antimicrobial compounds

Abstract: In agreement with the current trend of giving value to natural and renewable resources, the use of natural antimicrobial compounds, particularly in food and biomedical applications, becomes very frequent. The direct addition of natural compounds to food is the most common method of application, even if numerous efforts have been made to find alternative solutions to the aim of avoiding undesirable inactivation. Dipping, spraying and coating treatment of food with active solutions are currently applied to product prior to packaging as valid options. The aim of the current work is to give an overview on the use of natural compounds in food sector. In particular, the review will gather numerous case-studies of meat, fish, dairy products, minimally processed fruit and vegetables and cereal-based products where these compounds found application.

A review on recent research results (2008–2010) on essential oils as antimicrobials and antifungals. A review.

Abstract: The antimicrobial activity of essential oils is discussed in this review taking in account studies which were published in the period of time from 2008 until September 2010. Furthermore, the most important methods to examine the antimicrobial efficiency of essential oils are presented. The studies are divided into the following two groups, namely antibacterial and antifungal active agents depending on the activity of the applied essential oil against the test microorganisms. Various interesting possible applications are revealed such as the use of essential oils instead of synthetic drugs to circumvent the increasing resistance of some pathogens. Moreover, they could not only be used for the therapy of infectious illnesses, but also as preservatives in the food industry. A further possibility is, among others, the application of essential oils in skin products in order to treat or avoid dermal infections. Additionally, the prevalent constituents of the individual antimicrobial active essential oils are elaborated. Copyright © 2011 John Wiley & Sons, Ltd.

Methyl Eugenol: Its Occurrence, Distribution, and Role in Nature, Especially in Relation to Insect Behavior and Pollination

Abstract: This review discusses the occurrence and distribution (within a plant) of methyl eugenol in different plant species (> 450) from 80 families spanning many plant orders, as well as various roles this chemical plays in nature, especially in the interactions between tephritid fruit flies and plants.