http://www.asianjournalofchemistry.co.in/user/ViewFreeArticle.aspx?ArticleID=30_5_23

Abstract

The mechanical properties of bioplastic prepared from avocado seed starch and mycrocrystalline cellulose from sugar palm fibers as filler using Schweizer's reagent as solvent was studied. Bioplastics were prepared from avocado seed starch and reinforced with microcrystalline cellulose (MCC) from sugar palm fibers with composition ratio were 7:3, 8:2 and 9:1 (w/w) and using glycerol as plasticizer with variation of 0.1; 0.2; 0.3 and 0.4 (v/w of starch). Microcrystalline cellulose dissolved in the copper solution (Schweizer reagent) with ratio of MCC:copper solution is 1:10. Degree of crystallinity of microcrystalline cellulose was 97.5 %. Morphologycal analysis showed that the isolated microcrystalline cellulose from sugar palm fibers are rod-like shape with diameter of 5.55-9.44 µm and crystallite size of 25.08 nm. Mechanical properties of bioplastic showed that the best condition of bioplastics obtained at comparison of mass starchmicrocrystalline cellulose 7:3 and the addition of glycerol 0.1 (v/w) for tensile strength 20.874 MPa and elongation at break of 6.22 %.

Food and cosmetic applications of the avocado seed: a review

“…In the first study, researchers used sodium hydroxide, 22 whereas, in the second study, they used a copper solution. 23 Changing the solvents increased the tensile strength and elongation break percentage across all variables. 23 In general, the addition of filler to the starch during processing creates a more rigid bioplastic, whereas the addition of plasticizer creates a more elastic bioplastic.…”

“…23 Changing the solvents increased the tensile strength and elongation break percentage across all variables. 23 In general, the addition of filler to the starch during processing creates a more rigid bioplastic, whereas the addition of plasticizer creates a more elastic bioplastic. Out of all three studies,…”

“…20 Lubis et al and Sartika et al used microcrystalline cellulose (MCC) as the filler and glycerol as the plasticizer. 22,23 Their results revealed that lower quantities of plasticizer and increased amounts of filler yielded a better tensile strength. 22,23 Furthermore, higher quantities of plasticizer and decreased amounts of filler yielded better elongation at break % values.…”

“…22,23 Their results revealed that lower quantities of plasticizer and increased amounts of filler yielded a better tensile strength. 22,23 Furthermore, higher quantities of plasticizer and decreased amounts of filler yielded better elongation at break % values. However, the difference between the two studies was the solvent used to dissolve the MCC prior to its addition to the starch.…”

“…the bioplastic film with the best mechanical properties, in terms of strength, was the one made with a 7 : 3 starch to MCC ratio in copper solution with the addition of 0.1 mL g −1 (v/w of starch) of glycerol that showed a tensile strength of 20.874 MPa and an elongation at break of 6.22%. 23 Recently, Merino et al produced an avocado waste bioplastic with promising results. Employing acid hydrolysis, plasticizer, and pectin crosslinking, biodegradable and active food packaging was developed.…”