Polymeric materials with high capacity for water absorption, biodegradable and low cost, are versatile materials with great potential in the agricultural sector. This material can be used for the development of new technologies aimed at increasing productivity and reducing costs of crops. Thus, the objective of this work was to develop two artificial microbial growth systems based on biodegradable hydrogels that allow their use as inoculants of plant growth promoting microorganisms (PGPM). For this, dextrose, starch, agar, citric acid and sorbitol were used as polymer precursors. The obtained polymers were structurally and functionally characterized by: infrared spectroscopy, elemental analysis, thermogravimetric analysis, nuclear magnetic resonance, water absorption capacity and swelling volume. On the other hand, the construction of the bacterial inoculum was carried
Bacterial inoculeHydrogel Azotobacter Inoculos bacterianos hidrogeles Azotobacter
Starch is one of the biopolymers that has been recognized as promising for its application as an eco-friendly substitute for conventional polymers due to its biodegradable nature, low cost, and considerable abundance from renewable vegetal-type resources. In particular, the use of cassava starch as raw material in the manufacture of packaging materials has increased in recent years. Consequently, the analytical study of the quality and features of starch and its derivatives throughout their entire life cycle have gained importance, with non-destructive sample methods being of particular interest. Among these, spectroscopic methods stand out. The aim of this study was evaluated using spectroscopic techniques (i.e., mid-infrared spectroscopy (MIRS) and functional-enhanced derivative spectroscopy (FEDS)) for the monitoring of the effect of the thermal stress of starch in conjunction with computational tools such as density-functional theory (DFT). It is concluded that the FEDS technique in conjunction with DFT calculations can be a useful tool for the high-precision spectral analysis of polymers subjected to small thermal perturbations. In addition, it is demonstrated that small changes produced by thermal stress can be monitored by infrared spectroscopy in conjunction with FEDS at wavenumber range between 3800 and 3000 cm−1, which would allow for the implementation of spectral techniques instead of thermal techniques for out-lab evaluations and for the study of the thermal stress of biomaterials.
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