Investigation of Mannich reaction during co-liquefaction of microalgae and sweet potato waste

The accumulation of industrial by-products increases the use of sweet potato waste for ruminants, but ruminal pH characteristics are still not well known. The objective was to assess the fluctuation of ruminal pH in sheep supplemented with different levels of sweet potato flour inclusion in their diet. Four rumen-fistulated sheep were used; they were fed a diet based on ryegrass haylage (Lolium multiflorum) and sweet potato flour (Ipomoea batatas), provided according to the level of inclusion in the total diet (0, 0.5, 1.0 and 1.5%). Approximately 80 ml of ruminal fluid was collected for reading on a bench pH meter. Statistical data analysis was run on Statistical Analysis System (SAS Institute INC. Cary, NC, USA), and statistical difference was considered for p < 0.05. The animals that received 1.5% of sweet potato flour in their diet presented acid rumen pH; the 1.0% group presented rumen pH acidification in the first 6 hours after feeding, and the 0.5% level of inclusion did not change the rumen environment. It is concluded that the inclusion of 0.5% sweet potato flour in sheep diet proved to be an efficient energy supplementation strategy.

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Evaluation of effects of the dry‐heat‐processed sweet potato waste as broiler feed

Animal Science Journal ◽

10.1111/asj.13291 ◽

2019 ◽

Vol 90 (11) ◽

pp. 1468-1474

Author(s):

Xiaoxiao Zhang ◽

Yukun Zhang ◽

Daichi Ijiri ◽

Akira Ohtsuka

Keyword(s):

Sweet Potato ◽

Dry Heat ◽

Potato Waste ◽

Broiler Feed

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Integrated Efforts for the Valorization of Sweet Potato By-Products within a Circular Economy Concept: Biocomposites for Packaging Applications Close the Loop

Polymers ◽

10.3390/polym13071048 ◽

2021 ◽

Vol 13 (7) ◽

pp. 1048

Author(s):

Micaela Vannini ◽

Paola Marchese ◽

Laura Sisti ◽

Andrea Saccani ◽

Taihua Mu ◽

...

Keyword(s):

Sweet Potato ◽

Circular Economy ◽

Food Packaging ◽

Previous Treatment ◽

Sweet Potatoes ◽

Melt Mixing ◽

Hydrogen Bond Interactions ◽

Potato Waste ◽

Potato Products ◽

By Products

With the aim to fully exploit the by-products obtained after the industrial extraction of starch from sweet potatoes, a cascading approach was developed to extract high-value molecules, such as proteins and pectins, and to valorize the solid fraction, rich in starch and fibrous components. This fraction was used to prepare new biocomposites designed for food packaging applications. The sweet potato residue was added to poly(3-hydroxybutyrate-co-3-hydroxyvalerate) in various amounts up to 40 wt % by melt mixing, without any previous treatment. The composites are semicrystalline materials, characterized by thermal stability up to 260 °C. For the composites containing up to 10 wt % of residue, the tensile strength remains over 30 MPa and the strain stays over 3.2%. A homogeneous dispersion of the sweet potato waste into the bio-polymeric matrix was achieved but, despite the presence of hydrogen bond interactions between the components, a poor interfacial adhesion was detected. Considering the significant percentage of sweet potato waste used, the biocomposites obtained show a low economic and environmental impact, resulting in an interesting bio-alternative to the materials commonly used in the packaging industry. Thus, according to the principles of a circular economy, the preparation of the biocomposites closes the loop of the complete valorization of sweet potato products and by-products.

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Potential use of byproducts from cultivation and processing of sweet potatoes

Ciência Rural ◽

10.1590/0103-8478cr20160610 ◽

2017 ◽

Vol 47 (5) ◽

Cited By ~ 5

Author(s):

Winifred Akoetey ◽

Margaret Mead Britain ◽

Ruben Omar Morawicki

Keyword(s):

Sweet Potato ◽

Organic Waste ◽

Liquid Waste ◽

Potato Root ◽

Sweet Potatoes ◽

Waste Products ◽

Potato Waste ◽

Waste Solid ◽

Downstream Processes ◽

Potential Use

ABSTRACT: The cultivation and processing of sweet potatoes into a variety of products yields both solid and liquid organic waste. Solid waste includes peelings and trimmings from the sweet potato root and sweet potato leaves and vines. Liquid waste results from various processing methods and creates significant amounts of nutrient rich waste water. Sweet potato waste materials contain carbohydrates, proteins, phenolic compounds, macro and micro nutrients, and pigments that have the potential of being extracted or utilized for various downstream processes and products. This review examines many of the different ways that these waste products can be utilized.

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Conversion of Starchy Waste Streams into Polyhydroxyalkanoates Using Cupriavidus necator DSM 545

Polymers ◽

10.3390/polym12071496 ◽

2020 ◽

Vol 12 (7) ◽

pp. 1496

Author(s):

Silvia Brojanigo ◽

Elettra Parro ◽

Tiziano Cazzorla ◽

Lorenzo Favaro ◽

Marina Basaglia ◽

...

Keyword(s):

Sweet Potato ◽

Low Cost ◽

Cupriavidus Necator ◽

Waste Streams ◽

Promising Alternative ◽

Potato Waste ◽

Purple Sweet Potato ◽

Ssf Process ◽

By Products ◽

Simultaneous Saccharification

Due to oil shortage and environmental problems, synthetic plastics have to be replaced by different biodegradable materials. A promising alternative could be polyhydroxyalkanoates (PHAs), and the low-cost abundant agricultural starchy by-products could be usefully converted into PHAs by properly selected and/or developed microbes. Among the widely available starchy waste streams, a variety of residues have been explored as substrates, such as broken, discolored, unripe rice and white or purple sweet potato waste. Cupriavidus necator DSM 545, a well-known producer of PHAs, was adopted in a simultaneous saccharification and fermentation (SSF) process through an optimized dosage of the commercial amylases cocktail STARGEN™ 002. Broken rice was found to be the most promising carbon source with PHAs levels of up to 5.18 g/L. This research demonstrates that rice and sweet potato waste are low-cost feedstocks for PHAs production, paving the way for the processing of other starchy materials into bioplastics.

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A circular economy model for ethanol and alcohol-based hand sanitizer from sweet potato waste in the context of COVID-19

Brazilian Journal of Operations & Production Management ◽

10.14488/bjopm.2020.028 ◽

2020 ◽

Vol 17 (3) ◽

Author(s):

Caroline Trevisan Weber ◽

Lucas Ranzan ◽

Luciano Luís Menz Liesegang ◽

Luciane Ferreira Trierweiler ◽

Jorge Otávio Trierweiler

Keyword(s):

Sweet Potato ◽

Circular Economy ◽

Economy Model ◽

Hand Sanitizer ◽

Potato Waste

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Utilization Of Organic Fertilizer Compost Made From Purple Sweet Potato Waste (Ipomoea Batatas L.) To Increase The Production Of Pakchoy (Brassica Chinensis L.)

AJARCDE | Asian Journal of Applied Research for Community Development and Empowerment ◽

10.29165/ajarcde.v5i3.70 ◽

2021 ◽

Vol 5 (3) ◽

Author(s):

Sheila Dwi Shilviana ◽

Ni Luh Suriani ◽

I Ketut Sundra

Keyword(s):

Plant Height ◽

Sweet Potato ◽

Root Length ◽

Organic Waste ◽

Organic Fertilizer ◽

Dry Weight ◽

Potato Waste ◽

Wet Weight ◽

Number Of Leaves ◽

Purple Sweet Potato

Compost is an organic fertilizer made from recycled organic materials. Fertilizers can be made from organic waste or unused organic waste. Purple sweet potato waste can be reused into compost. The purpose of this study was to examine the effectiveness of purple sweet potato waste compost inoculated with Trichoderma harzianum in increasing the production of pakchoi and to determine the treatment of purple sweet potato waste compost to increase the production of pakchoi. The research method used is the experimental method. The experimental design used was RAK (Randomized Block Design) with 1 factor. The experiment consisted of 4 treatments of purple sweet potato compost 25 (B) g, 50 g (C), 75 g (D), 150 g (E), and 1 control (A), and was repeated 5 times. The data analysis technique used analysis of variance (ANOVA). Parameters observed were the number of leaves, plant height, leaf width, plant wet weight, plant dry weight, and root length. The results showed that the application of purple sweet potato compost affected increasing the growth and production of pakchoi. The right treatment in increasing the growth of pakchoi is treatment 150 g or treatment E. Treatment 150 g (E) can increase the number of leaves (13.13), plant height (16.32 cm), leaf width (4.88 cm), wet weight (16.60 g), dry weight (6.35 g), and root length (15.80 cm).

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