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SECTIONING GRAPEFRUIT by ENZYME DIGESTION Joseph H

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SECTIONING GRAPEFRUIT by ENZYME DIGESTION Joseph H Proc. Fla. State Hort. Soc. 91:112-114. 1978. SECTIONING GRAPEFRUIT BY ENZYME DIGESTION Joseph H. Bruemmer, Alicia W. Griffin Preliminary tests U. S. Citrus and Subtropical Products Laboratory1 P. O. Box 1909, Winter Haven, Florida 33880 In our first attempt to peel grapefruit by vacuum in fusion with solutions of commercial pectinase, we hand- Oladipo Onayemi scored the peel of a grapefruit in quadrants and placed it in University oflFE, a solution of 1.0% Irgazyme (one of the commercial Department of Food Science & Technology pectinases used later in the study) in a vacuum infusion ILE-IFE, Nigeria apparatus, a heavy-walled glass desiccator connected to a vacuum pump. We held a vacuum of 28 in. Hg in the ap paratus for about 5 min, then released the vacuum and re Additional index words, pectinase. placed the gas in the fruit with about 100 ml of pectinase solution. The grapefruit and solution were maintained at Abstract. Mature 'Duncan' grapefruit were vacuum in room temperature. Within several minutes after infusion, fused with a solution of commercial pectinase complex to the peel began to slowly disintegrate. The peel was easily evaluate enzyme digestion as a method for sectionizing. removed, and the slimy coating covering the fruit washed Treatment with 100 ppm enzyme effectively loosened the away under the faucet with a gentle stream of water. The peel and segment membranes and freed the intact juice peeled, washed grapefruit was then easily separated into sections, which could then be easily removed. A 16-member hemispheres, which were then fanned out on a flat surface. panel of tasters scored the sections "like moderately" for The segment membranes were easily separated from the flavor and texture. Six commercial pectinase complexes were vesicular tissue, so that intact sections could be removed. evaluated for effectiveness in preparation of intact sections None of the juice sections were broken. at standardized treatment conditions (122°F for 30 min). The In preliminary tests, we standardized the pectinase treat pectinases contained cellulase, pectinesterase, polygalac- ment and determined the minimum effective concentration turonase and polymethylgalacturonase. Their effectiveness in for each brand of commercial pectinase used. Ease of peel peeling correlated best with the activities of polygalac- ing, lack of adhering albedo, ease of removing sections from turonase and polymethylgalacturonase. The major advantage segment walls, and appearance of sections were evaluated of enzymic digestion is high recovery of high quality sections. and given scores of 1 = good, 2 = fair, or 3 = poor. Con Because the sections are not cut from the membrane, loss of centrations for each brand were selected so that 45 min of juice is minimal and dry packaging could be used for market treatment at 50°C (122°F) was adequate for effective treat ing the product. ment (Table 1). Table 1. Minimum concentration of 6 brands of pectinases required for The small portion (2 million boxes) of grapefruit pro effective peeling and sectionizing.2 duction that is processed as sections has remained relatively constant over the past 5 years. Current processing technology Pectinase brands is a major deterrent to expanded markets for sections. Proc A B C D E F essing costs are high because sections must be cut from the membranes and the yield is only about 60% of the total Pectinase 100 100 500 1000 1000 3000 juice segments. Quality is low because steam peeling, lye cone; ppm (1) (1) (5) (10) (10) (30) finishing, and heat pasteurization change the fresh grapefruit Treatment flavor and texture. Finally, treating and disposing the scores 15 min alkaline waste water from the lye finisher create problems 10 8 9 11 13 7 30 min 6 6 7 7 8 7 for the processor. We describe and evaluate the use of en 45 min 5 4 4 4 4 4 zyme digestion for peeling and sectionizing grapefruit. ^Criteria of effective peeling and sectionizing: ease of peeling, lack of adhering albedo; ease in removing sections from segment walls and Materials and Methods appearance of sections. Scores were determined for each treatment by Grapefruit (Citrus paradisi Macfad. cv. Duncan) were assigning the values 1 = good, 2, = fair and 3 = poor for each criterion. Values are the average sums of the four scores for six fruit. obtained from a local packer. Pectinases were provided by Grinsted Products, Inc., Overland Park, Kansas; G. B. Fermentation Industries, Inc., Des Plains, Illinois; Novo Peeling and sectionizing procedure Laboratories Inc., Wilton, Connecticut; Miles Laboratories, Inc., Elkhart, Indiana; Enzyme Development Corporation, The effectiveness of pectinase depends on temperature as New York, New York, and Ciba-Geigy Corporation, Ardsley, well as time. The manufacturers of the various pectinases New York. Pectin, N.F. #3442 and polygalacturonic acid recommended 122°F2 as the optimum temperature for #3491 (PGA) were products of Sunkist Groves, Inc., pectinase infusion. To do this without cooking the fruit, we Corona, California. Carboxymethylcellulose (CMC) was submerged the grapefruit, which had initial temperatures of obtained from Dow Chemical Co., Midland, Michigan. 68°-77°F, for 30 min in a water bath at 140°F. At the end of Gelatin was obtained from a local food supplier. the soak, the temperature of the albedo was 122°F, that of the core, 95°F. The fruit were then removed from the bath, and their peels were hand-scored from stem-end to blossom- end, dividing the sphere into six equal parts. The fruit were ^Science and Education Administration, U. S. Department of Agri then submerged in the enzyme solution (which was main culture, Agricultural Research. Mention of a brand name or trademark tained at 86°F) contained in the vacuum infusion apparatus. is for identification only and does not constitute endorsement of the product by the U. S. Department of Agriculture over others which may also Y> tofijte 2For metric conversions see table at front of this Yolume. Ed. 112 Proc. Fla. State Hort. Soc, 91: 1978. We pulled a vacuum of 28 in. Hg and held it for 5 min be The activity of pectinesterase was measured by increase fore readmitting air into the vessel. We repeated the vacuum in H+ liberated by the enzyme's substrate, pectin, during infusion and then removed the fruit from the solution and hydrolysis. Fifty ml of 1% pectin solution was heated to placed them into individual plastic food bags. After incubat 122°F, and 15 ml of dilute pectinase solution was added. ing the fruit for 30 min in an oven at 122°F, we removed the The temperature was controlled at 122°F in a water-jacketed fruit from the bags, peeled them, and split the fruit in half, vessel by a thermostatically controlled circulating bath. At then removed the juice sections from the segment walls. zero time the pH of the solution was adjusted to 4.0 with 0.5 N NaOH. As the reaction proceeded, the pH was mon Quality of enyzme prepared sections itored and kept at 4.0 by measured addition of 0.1 N NaOH from a burette. The volume of alkali added to maintain pH Grapefruit sections prepared by the enzyme digestion 4.0 was recorded every 2 min for 10 min. The volumes of method were evaluated for quality by comparing them to 0.1 N NaOH consumed were plotted against time and the sections cut from grapefruit peeled by the conventional slope of the proportionality line was calculated by the method. Grapefruit for the comparison were obtained from method of least squares. The pectinesterase activity of each a local canning plant. Steam-peeled, lye-finished grapefruit, brand of pectinase was expressed as the amount that hy- taken directly from the sectionizing table at the plant were drolyzed pectin at the rate of 20 /Ainoles of ester bonds per transported to the laboratory in ice chests where sections min at 122°F. were cut from the fruit segments. Unpeeled grapefruit, also from the plant, were peeled and sectionized by the pectinase Results and Discussion procedure described above. A panel of 20 tasters were pre sented grapefruit sections prepared by the two methods and Grapefruit sections prepared by pectinase treatment ap asked to evaluate them and indicate a preference on the peared dry and intact and tasted fresh and clean. The fruit basis of flavor and texture. The sections were also compared segments were completely recovered as intact sections. In for juice retention. A weighed portion of the two kinds of contrast, sections prepared by the conventional method of sections were stored in plastic bags for three days and then cutting appeared wet and smaller because 30 to 40% of the the sections were drained of juice and reweighed. juice vesicles remained attached to the segment membranes. The cut sections also sustained a drip loss of over 10% after Storage stability only 3 days at 40°F, whereas, the new type sections retain all their juices. In flavor and texture the sections prepared with Sections were coated with gelatin by dipping chilled pectinase were superior to cut sections. When asked to sections into 10% gelatin solution maintained at 77°F and evaluate and indicate a preference, all 20 members of a then setting them on waxed paper at 40°F. Coated and un- laboratory taste panel preferred the new type sections. coated sections were each packed in polyethylene bags for storage experiments. Storage of pectinase-peeled sections A panel of 12 tasters was selected from a group of 19 panelists who were surveyed for preference for grapefruit A panel of tasters judged unpasteurized pectinase- sections. The panel members were presented with pectinase- prepared sections stored dry or in grapefruit juice to be prepared grapefruit sections stored dry or in freshly pas similar in flavor and texture during 14 days of storage teurized grapefruit juice in plastic bags at 40°F.
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