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Manasikan Thammawong, Daisuke Nei, Poritosh Roy, Nobutaka Nakamura, Takeo Shiina, Yuuichi Inoue, Hidenobu Hamachi, and Shigeyuki Nonaka

) have suggested that total sugar content and sugar in the basal, middle, and apical sections of fresh-cut bamboo shoots initially decreased and then changed variably thereafter in different sections of the shoots during storage at 4 °C for 16 d. Kozukue

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Yong Zhang, Chunxia Fu, Yujing Yan, Xiaodan Fan, Yan’an Wang, and Ming Li

absorption spectrophotometer (Pye, Cambridge, U.K.). Determination of reducing sugar content. The samples was taken from the freezer and homogenized in 5 mL distilled water and centrifuged at 12,000 × g for 20 min. The precipitate was resuspended in

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Sofia Caretto, Angelo Parente, Francesco Serio, and Pietro Santamaria

), and beta-carotene content than fruits from plants without receiving any foliar K application ( Lester, 2005 ). In tomato, it has been reported that acid and reducing sugar contents, often correlated with K application, influence not only sweet and

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Sachiko Kawamura, Kyoko Ida, Masako Osawa, and Takashi Ikeda

. Triploid cultivars tended to have higher soluble solid contents (Brix) than diploids ( Maynard et al., 2002 ; Pardo et al., 1997 ). Seedless fruits induced by γ-irradiated pollen had significantly higher sugar content than seeded fruits ( Moussa and Salem

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Yu Wang, Haobo Yang, Shuai Zhong, Xin Liu, Tong Li, and Chengwen Zong

; Ryan and Dupont, 1973 ; Saftner et al., 2008 ). Specifically, total sugar content has a great influence on fruit quality, and it is one of the criteria determining alcohol content. Organic acids can improve wine color, although high organic acid

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Mylène Blanchard, Francois Castaigne, and Joseph Makhlouf

Our purpose was to study the impact of controlled atmosphere (CA) on respiration of and changes in sugar content of diced onions. The onions were peeled, diced, washed, disinfected, and centrifuged before storage for 12 days under gas mixtures of 21% O2 and 0% CO2 (air), 2% O2 and 0% CO2, and 2% O2 and 10% CO2. Every 4 days, respiration rate and sugar content (total, sucrose, fructose, and glucose) were determined. Carbon dioxide-enriched atmosphere limited respiration rate and sucrose depletion, whereas the mere reduction of O2 had no effect. Reducing sugar contents remained constant during storage regardless of the treatment.

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Abby K. van den Berg and Timothy D. Perkins

A field-portable tool for nondestructive foliar anthocyanin content estimation would be beneficial to researchers in many areas of plant science. An existing commercial chlorophyll content meter was modified to measure an index of anthocyanin content. The ability of the experimental anthocyanin meter (ACM) to estimate total extractable anthocyanin content was tested in sugar maple (Acer saccharum Marsh.) leaves representing several subjective color categories collected from a variety of field sites in northwestern Vermont on several dates in Autumn 2003. Overall, there was a significant linear relationship between anthocyanin content index (ACI) and total extractable anthocyanin content (r2 = 0.872, P < 0.001). Therefore, the ACM appears to be an effective tool for estimation of relative anthocyanin content in large samples of autumn sugar maple leaves.

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william M. Walter Jr.

The sugar content of the sweetpotato cultivars Centennial, Coroner, Georgia Red, Jewel, and Sweet Red was measured by nign performance liquid chromatography (HPLC) and compared to the sugar content found by measuring the refractive index of cellular sap and converting the refractive index value to sugar concentration. The sugar content and refractive index values were measured for just-harvested, cured and stored roots. Changes in the sugar content as determined by refractive index were found to be linearly related to changes 1n sugar content measured by HPLC, indicating that this method can be used to monitor changes in postharvest sugar content.

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William M. Walter Jr.

The sugar content of five sweetpotato [Ipomoea batatas (L.) Lam.] cultivars (`Centennial', `Cordner', `Georgia Red', `Jewel', and `Sweet Red') was measured by high-performance liquid chromatography (HPLC) and compared to the sugar content of the cellular sap measured by refractive index (RI). The HPLC and RI sugar contents were measured at harvest, after curing, and during storage. Changes in the sugar content, as determined by the RI, were found to be linearly related to changes in the sugar content of cell sap and tissue, as measured by HPLC, indicating that this method can be used to monitor changes in postharvest total sugar content.

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Teri A. Hale, Richard L. Hassell, and Tyron Phillips

The refractometer has been proposed as a rapid, inexpensive technique for determining sugar levels in fresh sweet corn (Zea mays). High performance liquid chromatography (HPLC) analysis of sugars in three phenotypes (su, se, and sh2) of sweet corn harvested at three maturities indicated that sucrose content was highly correlated with the total sugars (R = 0.95). Sucrose and total sugar concentration were significantly different among all phenotypes. Soluble solids concentration (SSC) was high in su and se compared to the lower SSC of sh2. Early, mature, and late harvested samples differed in sucrose and total sugar content. Sugar concentration varied within phenotypes at each maturity level. Sh2 indicated no difference in sucrose and total sugars at early and mature harvests, but increased at late harvest. In contrast, sucrose and total sugar content decreased between early and mature harvests, then increased to highest levels at late harvest in se and su phenotypes. Overall, phenotype SSC increased significantly from early to late harvests, probably due to increased water-soluble polysaccharides in the su and se cultivars. Unlike other crops, a negative relationship was found in sweet corn between SSC and sucrose or total sugars, with an overall correlation of –0.51. This relationship was most affected by maturity, especially mature and late harvested sweet corn. Among phenotypes, sucrose, total sugar, and SSC were poorly correlated. Our results indicate that a refractometer should not be used to estimate total sugars or sucrose of sweet corn.