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sweet potato

Inyoung Choi, Jun Young Lee, Monique Lacroix, Jaejoon Han
A new colorimetric pH indicator film was developed using agar, potato starch, and natural dyes extracted from purple sweet potato, Ipomoea batatas. Both agar and potato starch are solid matrices used to immobilize natural dyes, anthocyanins. The ultraviolet-visible (UV-vis) spectrum of anthocyanin extract solutions and agar/potato starch films with anthocyanins showed color variations to different pH values (pH 2.0-10.0). Fourier transform infrared (FT-IR) and UV-vis region spectra showed compatibility between agar, starch, and anthocyanin extracts...
March 1, 2017: Food Chemistry
Yi Ma, Chang-Jun Hou, Hui-Xiang Wu, Huan-Bao Fa, Jun-Jie Li, Cai-Hong Shen, Dan Li, Dan-Qun Huo
In this work, maltodextrin-grafted-cinnamic acid (MD-g-CA) was synthesized and used as wall material to improve the stability of purple sweet potato anthocyanins (PSPa) via microencapsualtion. MD-g-CA was prepared through esterification in a two-step convenient synthesis procedure and characterized using infrared (IR) spectroscopy. The IR data indicated the typical ester carbonyl stretching at around 1721cm(-1). Moreover, MD-g-CA could give about 40% inhibition of DPPH radical and present excellent UV-absorption, which were notably better than that of native MD...
August 11, 2016: Journal of Microencapsulation
Abimbola Peter Oluyori, Arun Kumar Shaw, Gabriel Ademola Olatunji, Preeti Rastogi, Sanjeev Meena, Dipak Datta, Ashish Arora, Sammajay Reddy, Saidha Puli
A bioassay-guided fractionation of an alcoholic extract from the peels of Ipomoea batatas Lam has been carried out. Sulforhodamine B and 2,2-diphenyl-1-picrylhydrazyl (DPPH) assays were used to evaluate the anticancer and antioxidant potential, respectively, while silica gel column chromatography (CC) was used to isolate compounds that were characterized using 1D- and 2D-NMR (Nuclear Magnetic Resonance) and mass spectrometry. The alcoholic extract was fractionated into n-hexane, ethyl acetate, n-butanol, and water...
September 27, 2016: Nutrition and Cancer
Hongyi Wei, Suguru Okunishi, Takeshi Yoshikawa, Yuto Kamei, Mahmoud A O Dawwoda, Sheila Mae S Santander-DE Leon, Sharon Nonato Nuñal, Hiroto Maeda
Antifungal bacteria (AB) in root rot fungus (RRF)-contaminated sweet potato farms were isolated, and seven strains were initially chosen as antagonistic candidates. An antagonistic test by using the mycelial disk placement method revealed that one AB strain by itself could inhibit the RRF growth. This AB strain was identified as Bacillus polyfermenticus based on phylogeny of 16S ribosomal RNA genes. Two AB strains (Bacillus aerophilus) displayed high levels of antifungal activity when paired with photosynthetic bacterial strain A (a purple nonsulfur photosynthetic bacterium Rhodopseudomonas faecalis)...
2016: Biocontrol Science
Bo Yuan, Ling-Wei Xue, Qiu-Yue Zhang, Wan-Wan Kong, Jun Peng, Meng Kou, Ji-Hong Jiang
Pathogenic fungi and oxidation are the major factors that cause the deterioration of sweet potatoes and also cause the loss of quality that makes consumption unsafe. In the present study, the in vitro results demonstrate that the essential oil from sweet potato vines exhibits significantly enhanced activity compared to that of the control. Furthermore, the essential oil can actively inhibit the growth of some common microorganisms inducing pathogenic bacteria and fungi (inhibition rates above 50% at low concentrations)...
October 12, 2016: Journal of Agricultural and Food Chemistry
Hui Yan, Qiang Li, Sung-Chul Park, Xin Wang, Ya-Ju Liu, Yun-Gang Zhang, Wei Tang, Meng Kou, Dai-Fu Ma
Abiotic stresses cause accumulation of reactive oxygen species (ROS) in plants, CuZnSOD and APX are first line defenses against ROS caused by oxidative stress. In this study, CuZnSOD and APX were transferred into salt sensitive sweet potato (cv. Xushu 55-2) under control of stress inducible SWPA2 promoter and tolerance to salt stress was evaluated. When 100 mM NaCl was used to treat stem cuttings, transgenic plants showed enhanced tolerance compared to wild type (WT) plants. Rooting was significantly retarded in WT plants whereas all transgenic plants had significantly enhanced root growth under salt stress...
September 4, 2016: Plant Physiology and Biochemistry: PPB
Janice L Atkins, Peter H Whincup, Richard W Morris, Lucy T Lennon, Olia Papacosta, S Goya Wannamethee
Dietary patterns are a major risk factor for cardiovascular morbidity and mortality; however, few studies have examined this relationship in older adults. We examined prospective associations between dietary patterns and the risk of CVD and all-cause mortality in 3226 older British men, aged 60-79 years and free from CVD at baseline, from the British Regional Heart Study. Baseline FFQ data were used to generate thirty-four food groups. Principal component analysis identified dietary patterns that were categorised into quartiles, with higher quartiles representing higher adherence to the dietary pattern...
October 2016: British Journal of Nutrition
Fredrick Onyango Ogutu, Tai-Hua Mu
The effect of ultrasound factors (time, power, and duty cycle) on sweet potato pectin molecular weight, neutral sugar composition, pectin structure, and antioxidant activity was investigated. Sweet potato pectin dispersions (0.0025, 0.005 and 0.01g/mL) in deionized water were sonolyzed for 5, 10 and 20min to assess effect of sonication time and pectin concentration on sonolysis. For further experiments 0.0025g/mL was sonicated under varying ultrasonic power and duty cycle levels, subsequently the molecular weight, galacturonic acid content, degree of methoxylation and antioxidant activity of sonicated pectin products were investigated...
September 3, 2016: Ultrasonics Sonochemistry
Solomon Maina, Owain R Edwards, Martin J Barbetti, Luis de Almeida, Abel Ximenes, Roger A C Jones
We present the first complete Sweet potato virus G (SPVG) genome from sweet potato in East Timor and compare it with seven complete SPVG genomes from South Korea (three), Taiwan (two), Argentina (one), and the United States (one). It most resembles the genomes from the United States and South Korea.
2016: Genome Announcements
Rina Shinjo, Kazuma Uesaka, Kunio Ihara, Kseniia Loshakova, Yuri Mizuno, Katsuya Yano, Aiko Tanaka
The complete genome sequence of the endophytic diazotroph Kosakonia sacchari, isolated from a sweet potato, was analyzed. The 4,902,106-bp genome with 53.7% G+C content comprises 4,638 open reading frames, including nif genes, 84 tRNAs, and seven complete rRNAs in a circular chromosome.
2016: Genome Announcements
Robert W Reid, Yan Luo, Sue Yan, Thomas E Miller, Bao-Hua Song
No abstract text is available yet for this article.
2016: Frontiers in Plant Science
S T Smith, L Metzger, M A Drake
Whey and milk permeates are by-products of high-protein dairy powder manufacture. Previous work has shown that these permeates contribute to salty taste without contributing significantly to sodium content. The objective of this study was to explore the sensory characteristics and compositional analysis of permeates from different milk and whey streams and a low-sodium product application made from them. Skim milk, Cheddar, cottage, and Mozzarella cheese whey permeates were manufactured in triplicate, and delactosed whey permeate was obtained in triplicate...
August 31, 2016: Journal of Dairy Science
Li Guo, Jian Hu, Juanjuan Zhang, Xianfeng Du
The hydrodynamic properties of potato starch and sweet potato starch in dilute and semi-dilute aqueous solutions were studied using a Ubbelohde viscometer, a transmission electron microscope, and steady shear rheological measurements. The results indicated that the potato starch solutions showed a linear shape of the ηred versus c curves. The sweet potato starch solutions presented a non-linear shape with a downturn in dilute solutions, or the concentrations were lower than entanglement concentration (ce)...
August 30, 2016: International Journal of Biological Macromolecules
Sherly Parackal
BACKGROUND: South Asians (SA) have a four to five fold higher risk for type 2 diabetes mellitus (T2DM) in comparison to other Asian migrant groups. Dietary patterns have been attributed as an important independent modifiable risk factor. OBJECTIVE: The aim of this review is to document the dietary patterns of SA migrants in Western countries and to summarize the evidence for the association of dietary patterns with T2DM and its pre-disposing factors. METHODS: Using key search words articles from 1990 onwards were sourced from MEDLINE ProQuest and PubMed (not MEDLINE) databases for this narrative review...
August 31, 2016: Current Diabetes Reviews
Ping Li, Shuren Ji, Qian Wang, Mengzhen Qin, Chen Hou, Yixin Shen
Rice straw and sweet potato vines are the main by-products of agricultural crops, and their disposal creates problems for the environment in the south of China. In order to establish an easy method for making rice straw silage successfully, experiments were conduct to evaluate fermentation quality and nutritive value of rice straw silages ensiled with or without sweet potato vine. Paddy rice straw (PR) and upland rice straw (UP) were ensiled alone or with sweet potato vines (SP) by a ratio of 1:1 (fresh matter basis), over 3 years...
August 23, 2016: Animal Science Journal, Nihon Chikusan Gakkaihō
Zhenzhou Zhu, Qingyan Guan, Mohamed Koubaa, Francisco J Barba, Shahin Roohinejad, Giancarlo Cravotto, Xinsun Yang, Shuyi Li, Jingren He
Ultrasound pre-treatment (UAE) was applied to assist the extraction of valuable compounds (polyphenols (especially anthocyanins), and proteins) from purple sweet potato (PSP). Under optimum conditions (ultrasound time (40min); supplementary hot extraction (80°C) up to 120min; pH: 2.5; ethanol concentration: 58%), the highest concentrations of polyphenols (3.877mg/g), anthocyanins (0.293mg/g), and proteins (0.753mg/g) were found, with minimal specific energy consumption (8406J/mg). Moreover, anthocyanin and non-anthocyanin polyphenols in PSP extract from optimized extraction temperature were identified using HPLC-DAD-ESI-MS(2)...
January 15, 2017: Food Chemistry
M C Mangwe, K T Rangubhet, V Mlambo, B Yu, H I Chiang
AIMS: This study investigated the influence of two microbial inoculants; Lactobacillus formosensis and Lactobacillus buchneri on fermentation quality, chemical composition, aerobic stability and in vitro ruminal biological activity of condensed tannins in sweet potato vines silage. METHODS AND RESULTS: Sweet potato vines were ensiled for 28 and 60 days; without inoculant (CON), with Lact. buchneri (LB) or with Lact. formosensis (LF), both inoculants applied to achieve 1 × 10(6)  CFU g(-1) fresh forage...
August 19, 2016: Journal of Applied Microbiology
T Oki, M Kano, F Ishikawa, K Goto, O Watanabe, I Suda
The objective is to evaluate the efficacy of anthocyanin-rich purple-fleshed sweet potato (PSP) beverage on the serum levels of gamma-glutamyl transferase (GGT), aspartate aminotransferase (AST) and alanine aminotransferase (ALT) in healthy Caucasians with borderline hepatitis. Forty healthy Caucasians (41-69 years) consumed three bottles of the PSP beverage (177 mg anthocyanins per 125-ml bottle) or placebo (1.3 mg) per day for 8 weeks. Thirty-nine subjects completed the study and two subjects were excluded from statistical analysis...
August 17, 2016: European Journal of Clinical Nutrition
Tomoyuki Oki, Mitsuyoshi Kano, Osamu Watanabe, Kazuhisa Goto, Esther Boelsma, Fumiyasu Ishikawa, Ikuo Suda
An open-label study with one treatment arm was conducted to investigate changes in health-related biomarkers (blood pressure and liver enzyme activity) and the safety of 4 weeks of consuming a purple-fleshed sweet potato beverage in Caucasian subjects. Twenty healthy adults, 18-70 years of age, with a body mass index >25 kg/m(2), elevated blood pressure and elevated levels of liver function biomarkers consumed two cartons of purple-fleshed sweet potato beverage (125 ml, including 117 mg anthocyanin per carton) daily for 4 weeks...
2016: Bioscience of Microbiota, Food and Health
Enriqueta Alós, Maria Jesús Rodrigo, Lorenzo Zacarias
Carotenoids are essential components for human nutrition and health, mainly due to their antioxidant and pro-vitamin A activity. Foods with enhanced carotenoid content and composition are essential to ensure carotenoid feasibility in malnourished population of many countries around the world, which is critical to alleviate vitamin A deficiency and other health-related disorders. The pathway of carotenoid biosynthesis is currently well understood, key steps of the pathways in different plant species have been characterized and the corresponding genes identified, as well as other regulatory elements...
2016: Sub-cellular Biochemistry
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