Browsing by Author "Saloni Rai"

Now showing 1 - 4 of 4

Effect of α-dl tocopherol acetate (antioxidant) enriched edible coating on the physicochemical, functional properties and shelf life of minimally processed carrots (Daucus carota subsp. sativus)
(Elsevier B.V., 2022) Divya Keshari; Abhishek Dutt Tripathi; Aparna Agarwal; Saloni Rai; Suresh Kumar Srivastava; Pankaj Kumar
The present study was carried out to investigate the effect of varying sodium alginate-based edible coating (1, 2, and 3 %, w/v) supplemented with α- tocopherol acetate (antioxidant) at different concentrations (0.5 and 1 % w/v) on minimally processed carrot slices during 15 d storage at 10 °C and 65 % relative humidity. Seven different formulations (T1- T7) comprising different alginate and antioxidant combination were tested for selecting the best formulation maintaining the physicochemical attributes, antioxidant potential, carotenoid content, and overall acceptability (microbial counts) of carrot slices. Treatment T4 (2% sodium alginate + 1% α-tocopherol acetate) served as the best formulation in maintaining the quality, acceptability, nutritive value of minimally processed carrots. The T4 treated carrot samples showed minimum variation in weight loss, TSS, pH, whiteness index, reducing sugar, ascorbic acid content, TPC, antioxidant activity, total carotenoids, total aerobic bacterial count and yeast and mold counts, respectively in comparison to other treatments during storage. The statistical analysis also confirmed the significant (p<0.05) variation in physicochemical properties, antioxidant potential, carotenoid content and microbial count in control samples than edible coating formulations during storage. © 2022
Intensification of Extraction Technologies for Functional Antioxidative Molecules From Black Pigmented Rice (Oryza sativa L.) and High-Resolution Mass Spectrometry (HRMS) of Rice Metabolome
(John Wiley and Sons Inc, 2025) Saloni Rai; Dinesh Chandra Rai; Raj Kumar Duary
Black pigmented rice (BPR) is a significant source of volatile and functional molecules, including anthocyanin, a potent antioxidant. Extracting these compounds can be challenging. Studies specifically examining the recovery of anthocyanins from the “Chakhao poireton” strain of black rice have not been conducted. This study aims to examine the effectiveness of various green extraction methods, including microwave-assisted extraction (MAE), ultrasound-probe-assisted extraction (UPAE), and microwave ultrasonic bath-assisted extraction (MUBAE) in comparison to conventional solvent extraction (CSE). The experimental design was set up using the Box–Behnken design (BBD) system and statistically optimized the conditions by response surface methodology (RSM) for antioxidant activity (DPPH% inhibition), total phenolic content (TPC), and total anthocyanin content (TAC), respectively, relating to the highest recovery of anthocyanin. The ultrasound-probe-assisted extraction (UPAE) method proved to be the most effective one with recovery of TPC, DPPH% inhibition, and TAC was 1.96 mg gallic acid equivalent (GAE)/g, 75.66%, and 3.1393 mg Cyd 3-glu/g at the optimized parameters 10:1 mL/g solvent-sample ratio, 0.45 s−1 cycle, and 15 min extraction time. The high-resolution mass spectrometry (HRMS) analysis of the extract demonstrated the presence of anthocyanin derivatives. These findings highlight UPAE as an effective green technology for recovering anthocyanins from BPR, offering a viable alternative to conventional methods. © 2025 The Author(s). Food Safety and Health published by John Wiley & Sons Australia, Ltd on behalf of International Association of Dietetic Nutrition and Safety.
Microbial Biopolymers and Enzymes Involved in the Biosynthesis of PHAs
(Springer Nature, 2022) Chhaya Goyal; Saloni Rai; Abhishek Dutt Tripathi; Dinesh Chandra Rai
Biopolymers are natural alternatives for synthetic polymers which can be obtained from natural sources and represent themselves as sustainable solution for nondegradable plastic. Biopolymers are plastic-like substances obtained from organic sources that have applications in the development of reliable, nontoxic, but degradable packaging materials. Organic sources of hydrocolloids, polysaccharides, lipids, and protein have been used to extract biopolymers. However, recently microbial production of biopolymers has received much attention. Polyhydroxyalkanoates (PHAs) are intracellular granules produced by certain microorganisms under nutrient stress. Several bacterial species (Cupriavidus necator, Pseudomonas stutzeri, P. oleovorans, P. aeruginosa, and Bacillus megaterium) and many fungal and algal species are known for PHA production. Structural and regulatory genes for PHA synthesis are present in an operon in producing microorganisms with slight differences. PHAs have many applications in various industrial sectors such as food, agriculture, and pharmaceuticals. PHA can be exploited in several ways like biofuel generation as well as can be used in packaging material. This chapter provides a comprehensive information of biopolymers and their composites, microbial biopolymers, and main biosynthetic pathways used for PHA production. Important aspects of PHAs, its biosynthesizing genes, and their relevant proteins have also been summarized. © The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2022.
Starch-PHA Blend-Based Biopolymers with Potential Food Applications
(John Wiley and Sons Inc, 2024) Veena Paul; Saloni Rai; Urvashi Vikranta; Alisha Nandan; Aparna Agarwal; Abhishek Dutt Tripathi
The growing population and societal consumption patterns associated with unsustainable production routes have increased pollution levels. Because of the environmental pollution caused by petroleum-derived plastics, it has become critical to develop an alternative biopolymer-based biodegradable plastic for long-term sustainability. Biopolymers are eco-friendly due to their nontoxicity, biodegradability, stability, biocompatibility, rheological, and thermal properties. However, these polymers' production methods have hindered their progress toward a bright future of sustainable production and growth. Therefore, improved formulations and tactics are needed to develop new approaches. A range of methods for application in industry can transform Polyhydroxyalkanoates (PHAs). Due to its affordability and simplicity of use, blending is regarded as one of the most successful methods. It has various uses, from absorbable sutures to biomedical implants and ecologically friendly resins, and useful applications in food packaging. Starch is a highly economical raw material and can be processed as an affordable substrate for innovative biodegradable polymers. In contrast to lowering water vapor and oxygen permeability, the addition of cross-linking agents to starch/PHA blends increases thermal stability, elasticity, and compatibility between the starch and PHA molecules in the films. This review focuses on the synthesis, physicochemical properties, and application of PHA-starch blends in the food industry. © 2024 Wiley-VCH GmbH.