Aging Time of Soluble Potato Starch Solutions for Ultrafine Fibers Formation by Electrospinning

Abstract

The objective of this study is to develop a methodology to produce ultrafine fibers of soluble potato starch with normal amylose content by electrospinning, and to evaluate the characteristics of the fibers produced from fiber‐forming solutions subjected to different aging times. The fiber‐forming polymer solutions are prepared with 40% soluble potato starch (with amylose content of 32.54 ± 3.65%) and formic acid (75%) as solvent. The solutions are allowed to age for 0, 24, 48, and 72 h before electrospinning. Viscosity and electrical conductivity of the solutions are determined. The electrospun fibers are analyzed for morphology, size distribution, and thermal properties, and investigated through Fourier‐transform infrared spectroscopy analysis. The shear viscosity of the solutions decreases as aging time increases from 0 to 48 h but did not change upon further aging (p > 0.05). The electrical conductivity did not influenced the studied properties in the present study such as morphology and size distribution of the fibers. The electrospun fibers show a morphology with beads and average diameter in the range 128–143 nm. The weight loss in thermal properties is lower in the fibers than in the starch. This study showes that soluble potato starch with normal amylose content can be converted into ultrafine fibers by electrospinning like a neat polymer in a fiber‐forming solution.

Effect of carvacrol encapsulation in starch‐based nanofibers: Thermal resistance and antioxidant and antimicrobial properties

“…Soluble starch from potato ((C 6 H 10 O 5 )n, CAS 9005‐25‐8) within 32.5 ± 3.6% of amylose content (Fonseca, Silva, et al., 2019) and carvacrol (≥98% purity, CAS 499‐75‐2) were purchased from Sigma‐Aldrich and formic acid (85% purity, CAS 01A1034.01) from Synth.…”

Starch nanofibers as vehicles for folic acid supplementation: thermal treatment, UVA irradiation and in vitro simulation of digestion

“…Soluble starch from potato (Sigma‐Aldrich, CAS 9005‐25‐8) was used with amylose content of 32.5 ± 3.6% 14 . Formic acid was used as solvent (85% purity, Synth, CAS 01A1034.01).…”

“…However, no studies, until recently, had been conducted regarding the production of starch with normal amylose content, which is a renewable, biodegradable, biocompatible and low‐cost polymer. Thus, we used electrospinning to produce ultrafine fibers from corn 13 and soluble potato starch, 14 both with normal amylose content. Since soluble potato starch nanofibers present desirable characteristics, such as homogeneous and continuous morphology, they have been previously used for the encapsulation of bioactive compounds including carvacrol 15 and pinhão coat extract 16 .…”

Review on Spinning of Biopolymer Fibers from Starch

“…According to Fonseca et al [ 50 ], soluble potato starch with normal amylose content has been converted into ultrafine fibers by electrospinning like a neat polymer in a fiber-forming solution. These researchers prepared fiber-forming polymer solutions with 40% soluble potato starch (with amylose content of 32.54 ± 3.65%) and formic acid (75%) as the solvent.…”

“…In this case, the addition of a second polymer is intended to promote entanglement. Likewise, the addition of starch can provide the ability to adjust the surface properties of polymer fibers [ 50 ]. The common limitations of native starch are related to their poor mechanical property, thermal stability, and their high hygroscopicity.…”