Physical Properties of Gelidium corneum–Gelatin Blend Films Containing Grapefruit Seed Extract or Green Tea Extract and Its Application in the Packaging of Pork Loins

Abstract

Edible Gelidium corneum-gelatin (GCG) blend films containing grapefruit seed extract (GFSE) or green tea extract (GTE) were manufactured, and the quality of pork loins packed with the film during storage was determined. Tensile strength (TS) and water vapor permeability (WVP) of the films containing GFSE or GTE were better than those of the control. The film's antimicrobial activity against Escherichia coli O157:H7 and Listeria monocytogenes increased with increasing antimicrobial concentration, resulting in a decrease in the populations of bacteria by 0.77 to 2.08 and 0.91 to 3.30 log CFU/g, respectively. Pork loin samples were inoculated with E. coli O157:H7 and L. monocytogenes. The samples packed with the GCG film containing GFSE (0.08%) or GTE (2.80%) had a decrease in the populations of E. coli O157:H7 and L. monocytogenes of 0.69 to 1.11 and 1.05 to 1.14 log CFU/g, respectively, compared to the control after 4 d of storage. The results showed that the quality of pork loins during storage could be improved by packaging them with the GCG film containing GFSE or GTE.

Release of active compounds from agar and agar–gelatin films with green tea extract

“…In contrast, other studies have reported an improvement in the mechanical properties of different polymeric matrices such as agaregelatin, chitosan or soy protein incorporated with green tea or grape seed extracts, although at lower concentrations than those used in this study in which the green tea extract makes up the 50% of the film forming solution. This effect may be due to the interactions established between polyphenolic compounds and the polymeric matrix (Hong et al, 2009;Siripatrawan & Harte, 2010;Sivarooban, Hettiarachchy, & Johnson, 2008).…”

“…Composite films have also been prepared from fish gelatin and different polysaccharides such as pectin or chitosan, seeking to improve the physical properties of these edible films (Liu, Liu, Fishman, & Hicks, 2007). However, to our knowledge, no much work has been done on agar/gelatin blends (Hong, Lim, & Song, 2009;.…”

Yenilebilir Film ve Kaplamalar: Üretimleri, Uygulama Yöntemleri, Fonksiyonları ve Kaslı Gıdalarda Kullanımları

“…Hong ve ark. [32] tarafından yapılan çalışmada, greyfurt tohumu ve yeşil çay ekstraktı ile zenginleştirilmiş deniz yosunu bazlı filmlerin gerilme kuvveti ve su buharı geçirgenliği kontrol filmlerine oranla daha yüksek bulunmuş ve filme katılan antimikrobiyal madde oranı arttıkça E. coli O157:H7 ve L. monocytogenes gelişimi önemli ölçüde inhibe edilmiştir. Karvakrol ile zenginleştirilmiş deniz yosunu bazlı filmler Lim ve ark.…”

Physical properties and antimicrobial activities of a persimmon peel/red algae composite film containing grapefruit seed extract

“…Essential oils and plant extracts such as lemongrass, rosemary, and grapefruit seed extract (GSE) are used as antimicrobials in foods (1). In particular, edible films containing GSE can be applied to food packaging to extend the shelf-life of various foods (6)(7)(8). Therefore, the objectives of this study were to prepare a composite film using PP as an inexpensive by-product of dried persimmon and to construct an antimicrobial film containing GSE.…”

“…Therefore, PP could be used as an edible film source if it had a film-forming ability. To enhance the mechanical properties of films, red algae (RA) such as Gelidium corneum have been used as a base material of composite films to improve the mechanical properties of protein films (6). Essential oils and plant extracts such as lemongrass, rosemary, and grapefruit seed extract (GSE) are used as antimicrobials in foods (1).…”