Frequency, moisture content, and temperature dependent dielectric properties of potato starch related to drying with radio-frequency/microwave energy

Zhu, Zhuozhuo; Guo, Wenchuan

doi:10.1038/s41598-017-09197-y

Cited by 57 publications

(20 citation statements)

References 51 publications

(46 reference statements)

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“…The potato tuber quality is very important to the processing industry, and the economic benefit can be improved by increasing the specific quality content and reducing the quality content of the negative effect in the process [4]. Potato starch, a representative of tuber starches, is the third largest starch raw material, with about 6% global starch production [5]. The starch content of raw potato could be improved by scientific field management and fertilization.…”

Section: Introductionmentioning

confidence: 99%

The Correlation between Soil Nutrient and Potato Quality in Loess Plateau of China Based on PLSR

et al. 2020

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Potato tuber quality is influenced by the interaction of soil nutrients. Hence, simple correlation analysis cannot accurately reflect the true relationship between soil nutrients and potato tuber quality. In this study, potato tuber quality and soil nutrient content were used as research materials in the Loess Plateau of China. The partial least square regression (PLSR) method was used to establish the regression equation between potato quality and soil nutrient. The major soil nutrient indexes influencing potato quality were screened out to provide theoretical basis for potato field management. The results showed that the major soil nutrient factors influencing the potato tuber quality in Loess Plateau were soil ammonium nitrogen, soil nitrate nitrogen, soil available phosphorus, pH, and soil available potassium. Soil pH value is the most important factor affecting potato starch, reducing sugar content, and soluble protein content. Soil nitrate nitrogen is one of the important factors affecting potato tuber soluble total sugar content, vitamin C, browning intensity, and polyphenol oxidase activity. Soil ammonium nitrogen was positively correlated with the total soluble sugar content of potato tubers, and negatively correlated with reducing sugar content, browning intensity, and polyphenol oxidase activity. However, soil available potassium has positive effects on potato starch and reducing sugar content, and negative effects on soluble protein and browning strength. Results of this study indicates that the major soil nutrient factors influencing potato tuber quality were soil nitrate nitrogen and soil pH value.

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Section: Introductionmentioning

confidence: 99%

The Correlation between Soil Nutrient and Potato Quality in Loess Plateau of China Based on PLSR

et al. 2020

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“…They are the real and imaginary parts, respectively, of the complex permittivity relative to free space, ε * = ε ′ − jε ″ . Some studies on dielectric properties of food materials and agricultural products, such as alcohols (Khaled, Novas, Gázquez, García, & Manzano‐Agugliaro, ), sugar (Franco, Yamamoto, Tadini, & Gut, ), honey (Guo, Liu, Zhu, & Wang, ), vegetable powders (Ozturk, Kong, Trabelsi, & Singh, ; Zhu & Guo, ), fruits (Barba & Lamberti, ), meats (Castro‐Giráldez, Dols, Toldr, & Fito, ; Tanaka, Mallikarjunan, & Hung, ), eggs (Lin, Zhang, Fang, & Liu, ; Soltani, Omid, & Alimardani, ), and so on, have shown that the dielectric properties are dependent on frequency and temperature. What is more, the dielectric properties also depend on the compositions of food, such as fat (Zhu, Guo, & Liang, ), protein (Zhu, Guo, Kang, Kong, & Zhu, ), water (Barba & Lamberti, ; Torrealba‐Melendez, Sosa‐Morales, Olvera‐Cervantes, & Corona‐Chavez, ), etc.…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties of raw milk as influenced by frequency, salts, and salt contents

Zhu

Liu

2018

J Food Process Engineering

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To understand the effect of salts and salt contents on dielectric properties (dielectric constant ε′ and dielectric loss factor ε″) of milk, dielectric properties of raw cow's milk samples at the total salt content (in mass) of 0.75–0.87%, 0.75–0.93%, and 0.75–0.90% by adding NaCl, MgCl2, and KCl, respectively, were obtained from 19 to 3,000 MHz at 25 °C using an impedance analyzer. The results showed that ε′ decreased with increasing frequency, and ε″ changed with “V” shape and had minimums at about 1,500 MHz. At a given frequency and the same salt addition level in molar, the milk added with NaCl and MgCl2 had the smallest and the biggest ε″, respectively. At about 40 MHz, ε′ had a very good positive linear relationship with the total salt content of milk, whose coefficients of determination were 0.96, 0.98, and 0.95 for NaCl, MgCl2, and KCl, respectively. ε″ increased linearly with increasing total salt contents with the coefficients of determination higher than 0.99 below about 900 MHz and higher than 0.86 above 900 MHz no matter for which salt. Practical applications This work shows that there were linear relationships between dielectric properties and total salt contents. The study is helpful to understand the influence of salts and salt content on dielectric properties of raw cow's milk, and it offers useful information for developing portable salt detector based on dielectric properties in the future.

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“…According to the scientific report, moisture content of starch normally remains from 9% to 15% (Zhu and Guo, 2017). For more authentication, this study tested the samples in triplicate.…”

Section: Ph and Moisture Contentmentioning

confidence: 99%

Optimization of the Novel Bisulfite Steeping Method by Response Surface Methodology for Natural Starch Synthesis From Oil Palm Trunk Biomass

Ahmed

Yusoff

Kamal

et al. 2020

Preprint

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Malaysia is the 2nd largest in palm oil export, and after overcoming economic age (average 25 years), the palm oil trees entail to replace usually. Therefore, a massive quantity of palm oil trunk biomass, containing a significant amount of starch, is available as bio-waste annually. The efficient extraction of this starch (carbohydrate polymer) would be worthwhile concerning the environment, economy, conversion of biowaste to bioresources, and waste dumping challenges. Central composite design executed an experimental model design, evaluated the impacts of process variables and their interaction through response surface methodology to optimize the novel bisulfite steeping method for starch synthesis. Design-Expert software performed the data analysis. The developed quadratic models for four factors (Strength of Sodium bisulfite solution, steeping hour, mixing ratio with the bisulfite solution and ultra-pure water) and one response (%Yield), demonstrated that a significant starch yield (13.54%) is achievable utilizing 0.74% bisulfite solution, 5.6 steeping hours, for 1.6 and 0.6 mixing ratio with the bisulfite solution and ultra-pure water respectively. Experimental outcomes were quite consistent with the predicted model, which eventually sustains the significance of this method. Malvern Zetasizer test revealed a bimodal granular distribution for starch, with 7.15µm of hydrodynamic size. Starch morphology was determined by scanning electron microscopy. X-ray diffraction investigation exhibits an A-type model, specifying persistent characteristics of extracted starch.

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Frequency, moisture content, and temperature dependent dielectric properties of potato starch related to drying with radio-frequency/microwave energy

Cited by 57 publications

References 51 publications

The Correlation between Soil Nutrient and Potato Quality in Loess Plateau of China Based on PLSR

The Correlation between Soil Nutrient and Potato Quality in Loess Plateau of China Based on PLSR

Dielectric properties of raw milk as influenced by frequency, salts, and salt contents

Optimization of the Novel Bisulfite Steeping Method by Response Surface Methodology for Natural Starch Synthesis From Oil Palm Trunk Biomass

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