Antimicrobial Characteristics of Different Parts of Guava against Food-Borne Bacteria

Abstract

Guava (Psidium guajava L.) contains high amount of vitamins and minerals, and its leaves have been reported to be very effective on reducing blood pressure. In this study, antimicrobial characteristics of extracts from four different parts of guava (fruit, branch, leaf, and seed) with four different solvents (methanol, ethanol, acetone, and water) were evaluated. Four targeted food-borne microorganisms were selected; two Gram negatives (Escherichia coli O157:H7 and Salmonella Typhimurium) and two Gram positives (Staphylococcus aureus and Listeria monocytogenes). By the paper disc method, guava extracts showed stronger clear hollow zone against Gram positive bacteria than Gram negatives in nutrient broth agar plate. Especially, extracts of branches and leaves showed significant antibacterial activity. Guava extracts also showed significant inhibition activity on the growth of Gram positive food-borne bacteria in nutrient broth. For example, S. aureus did not grow at all at 200 ppm of acetone extracts of guava branch and leaf. In the case of L. monocytogenes, the same concentration of acetone extracts of guava branch and leaf inhibited the growth 33.5% and 55.4%, respectively, at 32 hrs of incubation time. The results indicated that extracts of guava branch and leaf showed significant antibacterial activities against food-borne Gram positive microorganisms, and that guava branches, the byproducts of guava, might be a valuable resource for antibacterial materials. 구아바에는 terpenoid, flavonoid, tannin 등과 같은 여러 유 효성분이 알려져 있으며(3,9) 특히 flavonoid의 일종인

Effects of Natural Extract Mixtures on the Quality Characteristics of Sausages during Refrigerated Storage

“…The natural preservatives used in this study were mixed extracts of E. cava , P. guajava , and P. japonica (Makino) Miyabe & Takeda. It has been reported that guava leaf extract shows high antibacterial activity against gram-positive bacteria and that the flavonoid compounds with antibacterial activity ( Arima and Danno, 2002 ; Jo et al, 2009 ). E. cava and Paeoniae radix extracts were also reported for antibacterial activity ( Ahn, 1998 ; Chang et al, 1996 ; Lim et al, 2008 ; Park and Cho, 2010 ).…”

“…The natural preservatives used in this study were mixed extracts of Ecklonia cava, Psidium guajava, and Paeonia japonica (Makino) Miyabe & Takeda. It has been reported that guava leaf extract shows high antibacterial activity against gram-positive bacteria and that the flavonoid compounds with antibacterial activity (Arima and Danno, 2002;Jo et al 2009).…”

Natural Dyeing of Fabrics with Guava (Psidium guajava L.) Leaf Extract II - Dyeability and Functional Property of Cotton Fabrics -

“…Added to Food in the United States) 리스트에 정식 등재되 어 식품으로서 안전하게 사용될 수 있다고 명시한 바 있다 (Jo et al, 2009). 현재 우리나라에서는 의령, 경기도 안성, 제주 세 지역에서 주로 재배되고 있다 (Kim et al, 2010).…”

“…6에 나타내었다. (Jaiarj et al, 2000;Jo et al, 2009;Yang et al, 2008) 게 나타난 것으로 생각된다. 또한 구아바 잎에 함유된 폴리페 놀성 타닌 화합물 (Jaiarj et al, 2000;Jo et al, 2009;Yang et al, 2008)은 자외선을 강력하게 흡수한다는 결과 (Sul & Choi, 1994)와도 일치하는 것으로 나타났다.…”

Effect of Aqueous Extract of Guava (Psidium guajava L.) Leaves on the Oral Glucose Tolerance Test and Inhibition of Glycoside Hydrolase

“…구아바 잎에는 항산화효과가 있는 flavonoid, tannin과 같은 화합물이 보고되었으며 (Tanaka et al, 1992), 과실에는 myricetin, ellagic acid, anthocyanin 등의 페놀성 화합물과 비 타민 C, carotinoid 등이 높은 함량으로 존재한다고 보고되고 있다 (Miean and Mohamed, 2001;Misra and Seshadri, 1968;Mercadante et al, 1999). 특히, 구아바 잎 추출물은 항산화, 항암, 항알러지, 항균 효과가 있는 것으로 알려져 있 어 (Ghosh et al, 2010;Jaiarj et al, 1999;Jo et al, 2009;Park and Onjo, 2008;Qian and Nihormbere, 2004) (Fig. 1).…”